Between 1990 and 2010, global mercury emissions from manmade sources declined 30 percent, according to a new analysis by Harvard University, Peking University, the U.S. Geological Survey, the Max Planck Institute for Chemistry, and the University of Alberta. These results challenge long-standing assumptions about mercury emission trends.
Mercury is a metallic element that poses environmental health risks to both wildlife and humans when converted to methylmercury in ecosystems. It can be converted into gaseous emissions during various industrial activities, as well as natural processes like volcanic eruptions.
“For years, mercury researchers have been unable to explain the apparent conundrum between declining air concentrations and rising emission estimates,” said lead author Yanxu Zhang from Harvard University. “Our work is the first detailed, mechanistic analysis to explain the declining atmospheric mercury trend.”
The observed reduction in atmospheric mercury was most pronounced over North America and Europe, where several factors have contributed to the observed declines in atmospheric mercury concentrations:
- Mercury has been gradually phased out of many commercial products.
- Controls were put in place on coal-fired power plants that removed naturally occurring mercury from the coal being burned.
- Many power plants have switched to natural gas and stopped burning coal entirely, further reducing mercury emissions.
Finally, at the same time, efforts to combat acid rain resulted in controls being put in place on power plants to reduce nitrous oxide and sulfur dioxide emissions. This had the unintended benefit of also reducing mercury emissions.
“Previously, most mercury researchers subscribed to the notion that the ‘global mercury’ problem was largely manifested by a shared global emission inventory,” said USGS scientist David Krabbenhoft, one of the study’s co-authors. “However, our research shows that local and regional efforts to reduce mercury emissions matter significantly. This is great news for focused efforts on reducing exposure of fish, wildlife and humans to toxic mercury.”
The larger-than-anticipated role of local and regional efforts on global mercury emissions explains how increases in emissions in one area can be offset by decreases in other areas. Thus, while Asian mercury emissions increased between 1990 and 2010, European and North American emission reductions during the same time were enough to more than offset the Asian increases.
“This is important for policy and decision-makers, as well as natural resource managers, because, as our results show, their actions can have tangible effects on mercury emissions, even at the local level,” said study co-author Vincent St. Louis with the University of Alberta.
The study is entitled “Observed decrease in atmospheric mercury explained by global decline in anthropogenic emissions,” and is published in the Proceedings of the National Academy of Sciences. Read more information about the study.
The USGS Toxic Substances Hydrology Program provides objective scientific information on environmental contamination to improve characterization and management of contaminated sites, to protect human and environmental health, and to reduce potential future contamination problems. As part of that research, USGS provides information on mercury sources; mercury cycling in the atmosphere, land surface, lakes, streams and oceans; and bioaccumulation and toxicity of mercury. This information helps land and resource managers understand and reduce mercury hazards to people and wildlife.
ANCHORAGE, Alaska – A new digital geologic map of Alaska is being released today providing land users, managers and scientists geologic information for the evaluation of land use in relation to resource extraction, conservation, natural hazards and recreation.
The map gives visual context to the abundant mineral and energy resources found throughout the state in a beautifully detailed and accessible format.
“I am pleased that Alaska now has a state-wide digital map detailing surface geologic features of this vast region of the United States that is difficult to access,” said Suzette Kimball, USGS newly-confirmed director. “This geologic map provides important information for the mineral and energy industries for exploration and remediation strategies. It will enable resource managers and land management agencies to evaluate resources and land use, and to prepare for natural hazards, such as earthquakes.”
“The data contained in this digital map will be invaluable,” said National Park Service Director Jonathan B. Jarvis. “It is a great resource and especially enhances the capacity for science-informed decision making for natural and cultural resources, interpretive programs, and visitor safety.”
“A better understanding of Alaska’s geology is vital to our state’s future. This new map makes a real contribution to our state, from the scientific work it embodies to the responsible resource production it may facilitate. Projects like this one underscore the important mission of the U.S. Geological Survey, and I’m thankful to them for completing it,” said Sen. Lisa Murkowski, R-Alaska.
This map is a completely new compilation, carrying the distinction of being the first 100 percent digital statewide geologic map of Alaska. It reflects the changes in our modern understanding of geology as it builds on the past. More than 750 references were used in creating the map, some as old as 1908 and others as new as 2015. As a digital map, it has multiple associated databases that allow creation of a variety of derivative maps and other products.
“This work is an important synthesis that will both increase public access to critical information and enhance the fundamental understanding of Alaska's history, natural resources and environment,” said Mark Myers, Commissioner of Alaska’s Department of Natural Resources. “I applaud the collaborative nature of this effort, including the input provided by the Alaska Division of Geological and Geophysical Surveys, which will be useful for natural disaster preparation, resource development, land use planning and management, infrastructure and urban planning and management, education, and scientific research.”
Geologists and resource managers alike can utilize this latest geologic map of Alaska, and a lay person can enjoy the colorful patterns on the map showing the state’s geologic past and present.
More than other areas of the United States, Alaska reflects a wide range of past and current geologic environments and processes. The map sheds light on the geologic past and present. Today, geologic processes are still very important in Alaska with many active volcanoes, frequent earthquakes, receding and advancing glaciers and visible climate impacts.
“This map is the continuation of a long line of USGS maps of Alaska, reflecting ever increasing knowledge of the geology of the state,” said Frederic Wilson, USGS research geologist and lead author of the new map. “In the past, starting in 1904, geologic maps of Alaska were revised once a generation; this latest edition reflects major new mapping efforts in Alaska by the USGS and the Alaska state survey, as well as a revolution in the science of geology through the paradigm shift to plate tectonics, and the development of digital methods. Completion of this map celebrates the 200th anniversary of world's first geologic map by William Smith of England in 1815.”The Alaska Geologic Map shows the generalized geology of the state, each color representing a different type or age of rock. This map detail, of the Anchorage area, shows the city spread out on a plain of loose glacial deposits shown in yellow, and the bedrock making up the hillsides of Anchorage shown in green and brown. The rocks shown in green, called the Valdez Group, are sedimentary rocks formed in a trench 65 to 75 million years ago from thousands of undersea debris flows similar to the modern Aleutian trench where oceanic crust dives under continental crust (a subduction zone). The rocks shown in brown on the map are a chaotic mix of rock types called the McHugh Complex that were also formed about the same time, adjacent to this ancient subduction zone. Some time after deposition of the Valdez Group, hot fluids formed gold-bearing quartz veins; the veins were mined starting in the 1890's. The rocks were pushed up, and attached (accreted) to North America through plate tectonic forces in the past 65 million years. The dotted line passing through the east side of Anchorage is the approximate trace of the Border Ranges Fault system, the boundary between the accreted rocks and the rest of the continent.
Sea Lamprey Mating Pheromone Registered by U.S. Environmental Protection Agency as First Vertebrate Pheromone Biopesticide
Ann Arbor, MI – The U.S. Environmental Protection Agency registered a sea lamprey mating pheromone, 3kPZS, as the first ever vertebrate pheromone biopesticide in late December, 2015. Like an alluring perfume, the mating pheromone is a scent released by male sea lampreys to lure females onto nesting sites. Research and development of the mating pheromone was funded by the Great Lakes Fishery Commission, with additional support from the Great Lakes Restoration Initiative, in collaboration with federal government, university, and private industry partners.Parasitic mouth of the invasive sea lamprey. Photo credit: Andrea Miehls, USGS.
Since the 1990s, scientists have been researching the use of pheromones – natural odors used by sea lampreys to communicate – to manipulate sea lamprey behaviors. The newly registered mating pheromone has been used as bait in traps that collect and remove adult sea lampreys before they have a chance to spawn. Other sea lamprey pheromones are also being explored for use in sea lamprey control as attractants and repellents. Although “pesticide” may be part of the name, many biopesticides – such as the sea lamprey mating pheromone – naturally occur in the environment and are extremely potent, but not lethal, substances.
“The Great Lakes Fishery Commission is very excited about this accomplishment,” said Dr. Robert Hecky, chair of the commission. “U.S. EPA registration of the sea lamprey mating pheromone opens the door for use of the pheromone in the commission’s sea lamprey control program, which protects Great Lakes fisheries from destruction caused by invasive sea lampreys.” Dr. Hecky also emphasized the critical role of partners. “This achievement has been many years in the making and could not have occurred without the excellent work of our collaborators at the U.S. Geological Survey, Michigan State University, and Bridge Organics Company.”
Dr. Suzette Kimball, USGS director, praised registration of the sea lamprey mating pheromone as “a milestone for control of invasive species and protection of natural biodiversity.” She further emphasized the significance of this event saying, “Registration is the culmination of great leadership and innovation among the Great Lakes Fishery Commission, the USGS, and our university and private-sector partners. Development of the sea lamprey mating pheromone is exactly the type of cuttingedge research that places each partner at the forefront of science.”
The commission also lauded the U.S. EPA’s leadership and noted that this action provides a path for additional chemosensory compounds to be registered as a means to control other vertebrate species. Moreover, this registration marks the first joint review with Canada of a biopesticide through the North American Free Trade Agreement. The Health Canada Pest Management Regulatory Agency is in the process of registering the mating pheromone for use in Canada.
Since invading the Great Lakes in the 1800s and early 1900s, sea lampreys – parasitic, jawless vertebrates that feed on the blood and body fluids of other fish – have caused enormous ecological and economic damage. To combat this menace, the commission coordinates an integrated sea lamprey control program implemented by the U.S. Fish and Wildlife Service and Fisheries and Oceans Canada that combines lampricides, barriers, and traps. The control program is remarkably successful: sea lamprey populations in most areas of the Great Lakes have been reduced by 90 percent of their historical highs.
“Our research has shown that the sea lamprey mating pheromone holds great promise for the sea lamprey control program,” explained Dr. Weiming Li, professor at Michigan State University through the commission’s Partnership for Ecosystem Research and Management. “With a large-scale field trial, we demonstrated that pheromone baits can increase trapping efficiencies by up to 53 percent and baited traps can capture up to two times the sea lampreys that un-baited traps can.” While initial trials were completed with pheromone derived from live male sea lampreys, the researchers also discovered the molecular structure of the mating pheromone and contracted with Bridge Organics, a private company in Michigan, to manufacture a synthetic version.Invasive sea lamprey prey on commercially important fish species such as lake trout, living off of the blood and body fluids of adult fish. It is one of many fish species that USGS scientists study from the USGS Research Vessel Muskie. These lamprey belong to the Great Lakes Fisheries Commission. Photo credit: Marisa Lubeck, USGS.
Bridge Organics was a key partner in both the development of the synthesized mating pheromone and the U.S. EPA registration process. Like using a blueprint to construct a high-tech building, Bridge Organics used the molecular structure provided by the scientists to construct the exact pheromone molecule from scratch. “When the commission contacted us to synthesize the sea lamprey mating pheromone, we were excited by the scientific challenge,” recalled Dr. Ed Hessler, president of Bridge Organics. “Our company is proud to have developed the chemistry to synthesize the mating pheromone and to have coordinated testing of the compound during the registration process.”
The U.S. EPA registration covers both the synthesized male mating pheromone as well as the mixture of synthesized pheromone and solvents used in field applications. The U.S. FWS holds the registration for 3kPZS and is the entity licensed to apply this in the field when deemed appropriate. The mating pheromone is classified as a biopesticide, a designation that includes any naturally occurring substance that controls pests. Other registered biopesticides include the pheromone disparlure, which is used to detect and control small infestations of gypsy moths. Registration of the sea lamprey mating pheromone is the first for a vertebrate biopesticide.
Once registered in both the United States and Canada, the sea lamprey mating pheromone can be used to help control invasive sea lampreys in U.S. and Canadian waters throughout the Great Lakes. With each additional tool in the sea lamprey control arsenal, the commission improves its ability to protect the $7 billion fishery.
The USGS US Topo map program has entered its third, three-year cycle of revising and updating the digital US Topo maps. To start this new cycle, the USGS National Geospatial Program is excited to announce the inclusion of U.S. Census Bureau’s Topologically Integrated Geographic Encoding and Referencing (TIGER) roads data for the new US Topo maps, starting with the state of Wisconsin.
"The addition of TIGER’s roads layer into the US Topo maps is a great example of how data from one agency can benefit another agency,” said Timothy Trainor, Chief, Geography Division, U.S. Census Bureau. “The Census Bureau and the USGS have a long history of collaboration and sharing. This is another win for the American public."
The TIGER database is provided by the U.S. Census Bureau and was created before the 1990 census to provide over a million unique maps sheets to census enumerators. The TIGER was the basis for the first coast-to-coast digital map to modernize the once-a-decade count. Since 1990, TIGER has evolved into a dynamic mapping system that helped catapult the growth of the geographic information system industry and improve Census Bureau data products.
The TIGER database contains all geographic features — such as roads, railroads, rivers, and legal and statistical geographic boundaries — needed to support the Census Bureau’s data collection and dissemination programs. The TIGER/Line Shapefiles are constantly improving, updated annually, and available for free download.
TIGER’s roads layer includes 6.3 million miles of roads. The original TIGER GIS vector data are available for free download from the TIGER products page. TIGER data are public domain, so using these road data on US Topo removes a previous use restriction from this USGS map product
Other improvements to the new Wisconsin US Topo maps include the addition of the “crowdsourced” trail data from the International Mountain Bike Association, increased parcel land data (PLSS), and most recently, trail data from the U.S. Forest Service.
Additionally, segments of The Ice Age Trail, one of 11 National Scenic Trails, will continue to be featured on select US Topo maps. The USGS partnered with the National Park Service, Wisconsin Department of Natural Resources and Ice Age Trail Alliance to incorporate the Ice Age Trail onto Wisconsin's maps. The NPS is celebrating its 100th anniversary this year.
These new US Topo maps replace the second edition US Topo maps and are available for no-cost file download from The National Map, the USGS Map Locator & Downloader website , and several other USGS applications.
To compare change over time, scans of legacy USGS topo maps, some dating back to the late 1800s, can be downloaded from the USGS Historical Topographic Map Collection.
For more information on US Topo maps: http://nationalmap.gov/ustopo/.Updated 2015 version of the Madison West US Topo quadrangle with orthoimage turned on. (1:24,000 scale) (high resolution image 1.2 MB) Updated 2015 version of the Madison West US Topo quadrangle with orthoimage turned off to better see the improved road network. (1:24,000 scale) (high resolution image 1 MB) Scan of the 1890 legacy topographic map quadrangle of the greater Madison area from the USGS Historic Topographic Map Collection. (high resolution image 1.7 MB)
For salt marshes, hurricanes are just another day at the beach.
These coastal wetlands are in retreat in many locations around the globe—raising deep concerns about damage to the wildlife that the marshes nourish and the loss of their ability to protect against violent storms. The biggest cause of their erosion is waves driven by moderate storms, not occasional major events such as Hurricane Sandy, researchers from Boston University and the United States Geological Survey now have shown.
“Waves are very powerful because they attack the marsh in its weakest part,” says Nicoletta Leonardi, a Ph.D. candidate at BU’s Department of Earth & Environment and lead author on a paper published today in the journal PNAS. “Generally, the more a salt marsh is exposed to waves, the faster it is eroding.”
Analyzing eight salt marsh locations in Australia, Italy and the United States, “we found that the behavior of salt marshes is very predictable,” says Leonardi, with a constant relationship between wave energy and the speed of marsh erosion.
In fact, the work shows that hurricanes and other violent storms contribute less than 1 percent of salt marsh deterioration in those marshes, says Sergio Fagherazzi, BU Earth & Environment associate professor and co-author on the paper.
Along the New England coast, for example, the moderate northeast storms that may hit every few months strip away far more from the marshes than the hurricanes that may sweep through a few times a decade. “Salt marshes survive for thousands of years, which means they know how to cope against hurricane waves,” he says.
In a major storm, “beaches or dunes on a beach just collapse all at once,” Fagherazzi adds. “Marshes don’t, which is a major advantage if you are serious about using them for hazard mitigation and coast protection.”
“While hurricanes are catastrophic events, the salt marsh doesn’t respond catastrophically,” says Neil Kamal Ganju, a co-author and research oceanographer with USGS in Woods Hole, Massachusetts. In addition to the infrequency of hurricanes, that may be because a hurricane’s surge brings up water level so high over a marsh that waves have relatively little effect, he suggests.
Improved knowledge about salt marsh erosion brings an important new tool to those responsible for management and restoration of wetlands. “You can take the geography of a salt marsh and the estuary around it, and if you understand the wind climate and the wave climate, using historical data, you now can predict the marsh erosion,” says Ganju.
Globally, salt marshes are being lost to waves, changes in land use, higher sea levels, loss of sediment from upstream dams and other factors. This puts at risk “a lot of ecosystem services that we need to preserve,” Leonardi emphasizes. Many initiatives around the world now seek to protect and rebuild salt marshes. Evidence also suggests that, at least in some coastal environments, marshes can adapt to rising sea levels.
In the United States, the U.S. Army Corps of Engineers and many cities want to manage salt marshes as “living shorelines” that act as buffers between coastal communities and the ocean, Fagherazzi says. Such efforts kicked off in New Jersey and New York after Hurricane Sandy in 2012, and around New Orleans after Hurricane Katrina in 2005.
The effect of waves on salt marsh erosion, part of a USGS project to examine the response of estuaries to Hurricane Sandy, is being integrated into a USGS numerical model called COAWST (Coupled-Ocean-Atmosphere-Wave-Sediment Transport). COAWST combines models of ocean, atmosphere, waves and sediment transport for analysis of coastal change.
Better understanding of marsh erosion also may help in modeling carbon storage as it relates to climate change, the scientists say.
Founded in 1839, Boston University is an internationally recognized institution of higher education and research. With more than 33,000 students, it is the fourth-largest independent university in the United States. BU consists of 17 schools and colleges, along with a number of multi-disciplinary centers and institutes integral to the University’s research and teaching mission. In 2012, BU joined the Association of American Universities (AAU), a consortium of 62 leading research universities in the United States and Canada.
Aerial view of Beaver Creek, Alaska. Credit: Mark Dornblaser, USGS. (high resolution image)
USGS scientists have documented that the carbon that moves through or accumulates in lakes, rivers, and streams has not been adequately incorporated into current models of carbon cycling used to track and project climate change. The research, conducted in partnership with the University of Washington, has been published this week in the Proceedings of the National Academy of Sciences.
The Earth’s carbon cycle is determined by physical, chemical, and biological processes that occur in and among the atmosphere (carbon dioxide and methane), the biosphere (living and dead things), and the geosphere (soil, rocks, and water). Understanding how these processes interact globally and projecting their future effects on climate requires complex computer models that track carbon at regional and continental scales, commonly known as Terrestrial Biosphere Models (TBMs).
Current estimates of the accumulation of carbon in natural environments indicate that forest and other terrestrial ecosystems have annual net gains in storing carbon — a beneficial effect for reducing greenhouse gases. However, even though all of life and most processes involving carbon movement or transformation require water, TBMs have not conventionally included aquatic ecosystems — lakes, reservoirs, streams, and rivers — in their calculations. Once inland waters are included in carbon cycle models, the nationwide importance of aquatic ecosystems in the carbon cycle is evident.
Speaking quantifiably, inland water ecosystems in the conterminous U.S. transport or store more than 220 billion pounds of carbon (100 Tg-C) annually to coastal regions, the atmosphere, and the sediments of lakes and reservoirs. Comparing the results of this study to the output of a suite of standard TBMs, the authors suggest that, within the current modelling framework, carbon storage by forests, other plants, and soils (in scientific terms: Net Ecosystem Production, when defined as terrestrial only) may be over-estimated by as much as 27 percent.
The study highlights the need for additional research to accurately determine the sources of aquatic carbon and to reconcile the exchange of carbon between terrestrial and aquatic environments.
The Barnett Shale contains estimated mean volumes of 53 trillion cubic feet of shale natural gas, 172 million barrels of shale oil and 176 million barrels of natural gas liquids, according to an updated assessment by the U.S. Geological Survey. This estimate is for undiscovered, technically recoverable resources.
The previous USGS assessment of the Barnett Shale, which is located in Texas, was released in 2003 as part of an assessment of conventional and unconventional (continuous) reservoirs of the Bend Arch-Fort Worth Basin Province. That assessment estimated a mean of 26.2 trillion cubic feet of undiscovered natural gas and 1.0 billion barrels of undiscovered natural gas liquids within the Barnett Shale. Potential oil resources were not quantitatively assessed for the Barnett at that time.
“We decided to reassess the Barnett Shale following the successful introduction of horizontal drilling and hydraulic fracturing, setting the stage for the current shale gas boom,” said USGS scientist Kristen Marra, who led the assessment. “In addition, the newly revised assessment incorporates estimates for both gas and oil resources within the Barnett.”
The substantial increase in potential resources is largely due to the oil and gas industry’s switch to primarily horizontal drilling within the Barnett, paired with hydraulic fracturing. The 2003 USGS assessment relied solely on vertical drilling. Since 2003, more than 16,000 horizontal wells have been drilled into the formation. Those wells have helped produce more than 15 trillion cubic feet of natural gas and 59 million barrels of oil in the Barnett since the 2003 assessment.
The Barnett Shale is a significant source of potential natural gas resources. For comparison, in 2011, USGS estimated that the Marcellus Shale contained a mean of 84 trillion cubic feet of undiscovered natural gas. The Marcellus has helped fuel the shale gas boom in Pennsylvania and West Virginia.
Horizontal drilling is the practice of angling the well bore to travel along the rock layer, instead of drilling vertically through the formation. It is often paired with the practice of hydraulic fracturing to develop continuous oil and gas.
The Barnett Shale is not the only formation that USGS has reassessed as technology and geologic understanding have advanced. In 2013, USGS released an updated assessment of the Bakken Formation in North Dakota, and the 2011 assessment of the Marcellus Shale was itself an update from an earlier assessment.
USGS is the only provider of publicly available estimates of undiscovered technically recoverable oil and gas resources of onshore lands and offshore state waters. The USGS Barnett Shale assessment was undertaken as part of a nationwide project assessing domestic petroleum basins using standardized methodology and protocol.
The new assessment of the Barnett Shale may be found online. The 2003 Bend Arch-Fort Worth Basin assessment, which included the Barnett Shale, can also be found online. To find out more about USGS energy assessments and other energy research, please visit the USGS Energy Resources Program website, sign up for our Newsletter and follow us on Twitter.A map showing the Barnett Shale assessment area in east Texas. (High resolution image)
Key nonfuel mineral commodities that support the U.S. economy and national security are increasingly being sourced from outside the U.S., according to a new U.S. Geological Survey publication.
Over the past 60 years, there has been an increase in the number and diversity of nonfuel commodities that the U.S. imports as well as the extent to which the U.S. is import reliant. In 1954, for example, the U.S. was 100 percent import reliant for the supply of eight minerals commodities, meaning all of the supply came from outside of the U.S. By 2014 this number had increased to 19.
“Because the global distribution of mineral reserves and resources is not uniform, the United States has always been import reliant for some mineral commodities. It is important to recognize, however, that import reliance does not necessarily mean that there is a supply risk,” said Steven M. Fortier, Director of the USGS National Minerals Information Center. “Essentially, the type of commodities imported and the countries from which they are sourced determine risk related to import reliance.”
In addition, the new report also found the geographic distribution of sources has also changed dramatically. In 1954, the sources for imported mineral commodities were dominantly in the Western Hemisphere, with Canada, Mexico and Brazil as major suppliers. While these countries remain major suppliers today, the geographic distribution of mineral commodity import sources had become much more global with many new sources, particularly in Asia, by 1984. This trend has continued. By 2014, China had surpassed Canada as the leading import source, supplying 24 nonfuel mineral commodities, about half of the 47 nonfuel mineral commodities for which the United States was greater than 50 percent net import reliant.
“As the U.S. becomes increasingly reliant on a wide range of mineral resources needed to fuel technological developments that support our economy and national security, it is more important than ever that we continue to monitor and evaluate global changes in supply and demand of these important resources,” said Fortier.
Eighty five percent of male smallmouth bass and 27 percent of male largemouth bass tested in waters in or near 19 National Wildlife Refuges in the Northeast U.S. were intersex, according to a new study by U.S. Geological Survey and U.S. Fish and Wildlife Service researchers.
Intersex is when one sex develops characteristics of the opposite sex. It is tied to the exposure of fish to endocrine-disrupting chemicals that can affect the reproductive system and cause the development of characteristics of the opposite sex, such as immature eggs in the testes of male fish. Intersex is a global issue, as wild-caught fish affected by endocrine-disrupting chemicals have been found in locations across the world.
Estrogenic endocrine-disrupting chemicals are derived from a variety of sources, from natural estrogens to synthetic pharmaceuticals and agrochemicals that enter the waterways. Examples include some types of birth control pills, natural sex hormones in livestock manures, herbicides and pesticides.
“It is not clear what the specific cause of intersex is in these fish,” said Luke Iwanowicz, a USGS research biologist and lead author of the paper. “This study was designed to identify locations that may warrant further investigation. Chemical analyses of fish or water samples at collection sites were not conducted, so we cannot attribute the observation of intersex to specific, known estrogenic endocrine—disrupting chemicals.”
This prevalence of intersex fish in this study is much higher than that found in a similar USGS study that evaluated intersex in black basses in nine river basins in the United States. That study did not include river basins in the Northeast.
"The results of this new study show the extent of endocrine disrupting chemicals on refuge lands using bass as an indicator for exposures that may affect fish and other aquatic species," said Fred Pinkney, a USFWS contaminants biologist and study coauthor. "To help address this issue, the U.S. Fish and Wildlife Service encourages management actions that reduce runoff into streams, ponds and lakes -- both on and off of refuge lands.”
The journal article, Evidence of estrogenic endocrine disruption in smallmouth and largemouth bass inhabiting Northeast U.S. National Wildlife Refuge waters: a reconnaissance study,” by L.R. Iwanowicz, V.S. Blazer, A.E. Pinkney, C.P. Guy, A.M. Major, K. Munney, S. Mierzykowski, S. Lingenfelser, A. Secord, K. Patnode, T.J. Kubiak, C. Stern, C.M. Hahn, D.D. Iwanowicz, H.L. Walsh, and A. Sperry is available online in Ecotoxicology and Environmental Safety.
A new approach to ranking copper resources could result in identifying future supplies of copper while saving both time and money, according to the U.S. Geological Survey. This technique has been used to evaluate 10 areas of the world where undiscovered copper resources in sedimentary rock could be found. The areas are in addition to five, higher priority areas recently studied by the USGS.
Ultimately, the results of the assessment indicate that the top three areas in the ranked list are in Namibia and Botswana (Northwest Botswana Rift), Angola (Benguela and Cuanza Basins), and the Middle East (Egypt–Israel–Jordan Rift). The only area in the United States, an area in Montana (Belt-Purcell Basin), is ranked 6th on the list.
“This new approach has the potential to be a real boon in studying mineral deposits,” said USGS scientist Michael Zientek, the study’s lead author. “Not only is it faster and less expensive, it also gives us robust, quantifiable results to help us better direct our focus and resources in studying minerals.”
All 10 of these areas represent possible future sources of supply. Some currently have no significant mineral production. Montana’s Belt-Purcell Basin has only one operating mine in production. The areas are in addition to five, higher priority areas recently studied by the USGS.
Other areas have been known for some time to have significant copper resources. The Jordan-Israel-Egypt Rift was mined in antiquity and was a major source of copper for bronze-age cultures in the region.
The 10 areas ranked were included because they have a range of data quality and availability, as well as ample access to geologic, tectonic and mineral resource information.
“Copper is one of the critical and strategic minerals of our economy, making it a perfect choice to test this novel approach on,” said Larry Meinert, Program Coordinator for the USGS Mineral Resources Program. “Identifying and understanding our domestic mineral wealth is a vital part of ensuring the security of our supply chain for these resources.”
The new ranking tool works by taking expert opinions and breaking them into explicit and quantifiable criteria that can then be compared and ranked. Expert opinions are a traditional method of evaluating mineral deposits, but lack transparency. This approach not only brings a level of transparency, but also, as this latest research demonstrates, is straightforward and robust.
This new study is part of a larger Global Mineral Resource Assessment effort to update knowledge of the geologic setting, occurrence, and amount of the Nation’s and World’s copper resources.Figure showing the top three ranked areas. Clockwise from the top: Northwest Botswana Rift, Benguela and Cuanza Basins, and the Egypt–Israel–Jordan Rift. (High resolution image)
Scientists from the National Park Service and the U.S. Geological Survey have reconstructed the recent migration history of ponderosa pine trees in the central Rocky Mountains. Their recently published study on the movement of this species, through centuries and across complex terrain, is unprecedented in its methodology and scope. The investigation informs an uncertain climate and ecological future.
Experts project that climate change will force many species to adjust their geographical distributions in the near future, with cascading consequences for biodiversity, conservation biology, and ecosystem services. Important lessons can be drawn from an understanding of the movement rates and pathways of northward migrations of vegetation that followed the end of the last Ice Age, some of which are still ongoing.
Ponderosa pine (Pinus ponderosa), the most widely distributed pine in North America, experienced one of the most rapid and extensive of these post-glacial plant migrations. The eastern race of ponderosa pine (variety scopulorum) spread northward along the Rocky Mountains, starting at its northernmost known distribution in southern New Mexico and Arizona around 13,000 years ago, and reached central Montana only within the last millennium. The western race (variety ponderosa) experienced a parallel but less well-known migration along the Sierra Nevada, eventually mingling with the northernmost populations of the eastern race in the northern Rockies.
The researchers, funded in part by the National Science Foundation, focused their efforts on the northern half of the distribution in South Dakota, Wyoming, and Montana, which they assumed had experienced the most recent spread of ponderosa pine. The study targeted sites where ponderosa grows today in settings suitable for the preservation of fossil packrat middens.
Packrat middens are rock-hard amalgamations of easily-identified plant and animal remains embedded in crystallized urine, commonly preserved in rock shelters and crevices, and readily datable to within a few decades using radiocarbon analysis. Since the 1960s, several thousand middens found in semi-arid areas from Mexico to Canada have been analyzed to reconstruct vegetation changes over the past 50,000 years.
The team collected 90 middens spanning the last 11,000 years to pinpoint the arrival of ponderosa pine at each of 14 sites in western South Dakota, northern Wyoming, and west-central Montana. Jodi Norris, a National Park Service ecologist and senior author of the study, likened the fieldwork to “a treasure hunt where you and your science buddies clamber on cliffs looking for packrat leftovers to track the natural spread of a common conifer in the West.”
A key finding was that the eastern race of ponderosa spread across the region by island hopping a few tens of kilometers at a time to suitable establishment sites, likely aided by seed dispersal via birds. The eastern race colonized many of its northernmost sites, including sites where it now hybridizes with the western race in West-Central Montana, only within the last two millennia.
Norris and her USGS co-authors, Julio Betancourt and Stephen Jackson, used a bioclimatic model for the modern distribution of ponderosa pine to infer that the most recent spread must have been driven by increases in July temperature and precipitation. Future expansion of the ponderosa pine range will largely depend on the nature and pace of climate change in the region (principally warming). Considering other factors such as heavy land use and invasive species, native plant migrations in the future might be more complicated than in the past.
Betancourt cautioned, “Ponderosa pine migration in the past happened sluggishly in fits and starts, tracking the pace of climate variability. But future migration will have to march to unusually rapid warming, this time disrupted by pervasive land use. If expansion to increasingly warmer and more suitable sites far to the north is desirable, ponderosa dispersal will have to be assisted by deliberate and strategic planting.”
The research study, authored by Jodi Norris (National Park Service-Flagstaff; Northern Arizona University), Julio Betancourt (USGS-Reston, Va.), and Stephen Jackson (USGS-Tucson), was published online in the Journal of Biogeography.
Reston, VA— The United States is completely reliant on imports of tantalum, which is a commonly used element in electronics, to meet its domestic consumption for economic and national security needs. A new U.S. Geological Survey report illustrates the dramatic change of the international sources of primary mined tantalum over the past 15 years.Annual mine production of tantalum contained in mined concentrates by country for the years 2000 through 2014 and events that affected mine production.(High resolution image)
Tantalum possesses unique material properties that make it particularly well suited for use as a capacitor in sophisticated electronic circuits in everything from smartphones to defense applications.
Tantalum is named as a “conflict mineral” under the 2010 Dodd-Frank Act; this act requires companies that use tantalum, tungsten, tin and gold to perform due diligence on their supply chains to determine whether these materials were sourced in the Democratic Republic of the Congo or adjacent countries. Tantalum is also widely viewed as a critical mineral because of the impact a supply disruption could have on important applications in electronic systems. Consequently, it is one of the mineral commodities tracked by the U.S. Defense Logistics Agency as part of its mission to maintain the National Defense Stockpile.
As illustrated in the chart below, primary mining of tantalum has undergone a major geographic shift from the year 2000, when supply was dominated by Australia and Brazil, to the current situation where supply is principally from the Democratic Republic of the Congo, Rwanda, and other African nations. Global supply has migrated from countries characterized by low governance risk, industrial mining practices, and supply chain transparency to countries characterized by high governance risk, artisanal methods, and a lack of supply chain transparency.
Sources of tantalum produced from 2000-2014
"Tantalum occupies a special niche among metals as a result of its position at the nexus between conflict and critical minerals," said Steven M. Fortier, director of the USGS National Minerals Information Center that produced the recent report. “The dramatic shifts in primary mine production of tantalum over the past 15 years is a textbook example of why the USGS plays such an active role in collecting, analyzing and disseminating information on mineral commodities of importance to the U.S. economy and national security.
To learn more about tantalum visit the Mineral Commodity Summaries 2015 webpage.
Continued Decline of the Northern Spotted Owl Associated with the Invasive Barred Owl, Habitat Loss, and Climate Variation
CORVALLIS, Ore. – Northern spotted owl populations are declining in all parts of their range in the Pacific Northwest, according to research published in The Condor. Based on data from 11 study areas across Washington, Oregon and northern California, a rangewide decline of nearly 4 percent per year was estimated from 1985 to 2013.
Researchers found evidence that the invasive barred owl is playing a pivotal role in the continued decline of spotted owls, although habitat loss and climate variation were also important in some parts of the species range. Barred owls compete with spotted owls for space, food and habitat.
This research indicated that since monitoring began spotted owl populations declined 55-77 percent in Washington, 31-68 percent in Oregon and 32-55 percent in California. In addition, population declines are now occurring on study areas in southern Oregon and northern California that were previously experiencing little to no detectable decline through 2009.
Dr. Katie Dugger, a research biologist at the USGS Oregon Cooperative Fish and Wildlife Research Unit, Oregon State University and lead author on the report, said that “This study provides strong evidence that barred owls are negatively affecting spotted owl populations. The presence of barred owls was associated with decreasing spotted owl survival rates in some study areas and spotted owls were disappearing from many of their historical breeding territories as those areas were invaded by barred owls.”
The exception was a small area in California where barred owl removals began in 2009, and where long-term population declines were only 9 percent. Spotted owl populations and survival rates have increased on the latter area since the removal of barred owls started. However, further research on barred owl removal is required in other parts of the spotted owl’s range -- especially in Washington, where barred owl numbers have been high for a long time.
Additionally, said Dugger, "The amount of suitable habitat required by spotted owls for nesting and roosting is important because spotted owl survival, colonization of empty territories, and number of young produced tends to be higher in areas with larger amounts of suitable habitat, at least on some study areas."
Relationships between spotted owl populations and climate was complex and variable, but rangewide, the study results suggested that survival of young spotted owls and their ability to become part of the breeding population increased when winters were drier. This may become a factor in population numbers in the future, given climate change predictions for the Pacific Northwest include warmer, wetter winters.
The collaborative team of 37 researchers analyzed data from 11 study areas that represented 9 percent of the spotted owl range. During the study, field crews monitored how many owls inhabited different territories, and the yearly survival and reproductive success of banded spotted owls. “This type of collaborative research focused on specific management and conservation objectives provides important information for resource managers and policy decision-makers who manage public resources,” said Eric Forsman, a coauthor on the study at the USDA Forest Service, Pacific Northwest Research Station.
The paper, “The effects of habitat, climate and barred owls on long-term demography of northern spotted owls,” was published in The Condor: Ornithological Applications and authored by Katie M. Dugger, USGS, Oregon Cooperative Fish and Wildlife Research Unit, Oregon State University Department of Fisheries and Wildlife; Eric D. Forsman, USDA Forest Service, Pacific Northwest Research Station; Alan B. Franklin, USDA APHIS National Wildlife Research Center; Raymond Davis, USDA Forest Service, Pacific Northwest Region, and 33 others.
Although they do occur in young forests in some areas, northern spotted owls are strongly associated with old forest in most of their range. The U.S. Fish and Wildlife Service listed the northern spotted owl as threatened in 1990 because of the declines in old-growth forest habitat throughout its range in Washington, Oregon and northern California.
For the first time, land and resource managers in the Great Lakes will be able to distinguish between the various sources of mercury in the environment, a toxic chemical of significant concern in the region. This is thanks to a new tool that “fingerprints” the mercury, developed by the U.S. Geological Survey and the University of Wisconsin-Madison.
For Lakes Superior and Huron, atmospheric mercury is the dominant form, while in Lakes Erie and Ontario, most mercury comes from industrial activity or runoff from the watersheds of the lakes. Lake Michigan is dominated in some areas by atmospheric mercury, in other areas by industrial activity and in still others by watershed contributions.A map showing the relative concentrations of mercury sources as identified by the fingerprinting tool. (High resolution image)
“I’ve been involved in mercury research for nearly 28 years,” said USGS scientist Dave Krabbenhoft, the project chief. “Back in the 1980’s, when I first got into this area of research, I dreamed of a tool that could provide geochemical markers of mercury sources. That dream has now become reality.”
Determining where the mercury comes from is important, because it informs decisions designed to minimize it. For example, minimizing industrial sources of mercury alone will not be effective if the majority of mercury entering the Great Lakes is from atmospheric mercury.
“One of the surprising things we saw was just how much of the mercury building up in fish was due to atmospheric mercury,” said Krabbenhoft. “This shows that atmospheric mercury needs to be emphasized, even when the sediments in the Lakes show relatively little atmospheric mercury accumulation.”
Although this fingerprinting tool was pioneered for the Great Lakes, it can be applied elsewhere. A very common situation across the United States and elsewhere is the presence of large amounts of mercury that was released during industrialization, so-called legacy mercury. At these sites, resource managers often lack a tool to help them understand whether it is legacy or other sources that substantively contribute to exposures in fish, wildlife and humans today.
“We are very excited to explore the capability of this new tool to inform resource managers and decision makers responsible for managing these challenging situations,” said Krabbenhoft.
Mercury is a naturally occurring element that can have toxic effects on people’s brains, kidneys and lungs. In certain environments, it can also bind with carbon and hydrogen to become methylmercury, which is far more toxic than elemental mercury. In addition, methylmercury can build up in the tissues of fish and other aquatic organisms, resulting in higher doses when people or other animals eat them.
More information about this new tool can be found online. USGS provides information on mercury sources; mercury cycling in the atmosphere, land surface, lakes, streams and oceans; and bioaccumulation and toxicity of mercury. This information helps land and resource managers understand and reduce mercury hazards to people and wildlife.
A map of the assessed area in Texas. (High resolution image)
DENVER, CO. — The potential for almost five years of annual domestic U.S. nuclear fuel requirements may exist in south Texas, according to a new USGS assessment of both identified and undiscovered uranium oxide resources. This assessment estimates 60 million pounds of identified, but unmined, uranium resources, and more than 200 million pounds of newly estimated undiscovered resources.
The uranium oxide is located in sandstone formations throughout the South Texas Coastal Plain, which borders the Gulf of Mexico. The area has long been known to contain uranium, and two mines are currently in operation, with a number of companies actively exploring for uranium.
“As the world’s leader in nuclear power, uranium is both a critically and strategically important resource,” said Larry Meinert, program coordinator of the USGS Mineral Resources Program. “Identifying and understanding our domestic mineral wealth is a vital part of ensuring the security of our supply chain for these resources.”
The 60 million pounds of identified uranium resources could, if mined, provide up to one year’s worth of domestic nuclear fuel requirements, based on 2014 requirements. The 200 million pounds of undiscovered resources could, if proven and produced, add another four years of nuclear fuel for the United States, bringing the total potential to about five years of domestic supply.
U.S. nuclear power plants generate about 19 percent of the Nation’s electricity. In 2014 alone, these plants purchased 53 million pounds of uranium oxide to meet their needs, and U.S. nuclear capacity is expected to increase.
The United States has more nuclear plants than any other country, but imports more than 90 percent of the uranium used in those plants.
“This study highlights the breadth of USGS science related to complex issues associated with the mineral and energy resources lifecycle,” said Jon Kolak, acting program coordinator for the USGS Energy Resources Program. “The USGS provides impartial information to help resource managers, policymakers, the public, and others balance the need for adequate and reliable mineral and energy supplies against the potential effects of resource development and use on the landscape.”
This new study is part of a larger USGS effort to update knowledge of the geologic setting, occurrence, and amount of the Nation’s uranium resources.
The USGS collaborated with the Texas Bureau of Economic Geology on the South Texas assessment. Nuclear power requirements and electricity production are tabulated by the U.S. Energy Information Administration.
A fact sheet describing this assessment is online. The USGS provides both energy resource assessments and mineral resource assessments. To stay up to date on all of our energy and mineral resources research, follow us here:
Using statistically modeled maps drawn from satellite data and other sources, U.S. Geological Survey scientists have projected that the near-surface permafrost that presently underlies 38 percent of boreal and arctic Alaska would be reduced by 16 to 24 percent by the end of the 21st century under widely accepted climate scenarios. Permafrost declines are more likely in central Alaska than northern Alaska.
Northern latitude tundra and boreal forests are experiencing an accelerated warming trend that is greater than in other parts of the world. This warming trend degrades permafrost, defined as ground that stays below freezing for at least two consecutive years. Some of the adverse impacts of melting permafrost are changing pathways of ground and surface water, interruptions of regional transportation, and the release to the atmosphere of previously stored carbon.
“A warming climate is affecting the Arctic in the most complex ways,” said Virginia Burkett, USGS Associate Director for Climate and Land Use Change. “Understanding the current distribution of permafrost and estimating where it is likely to disappear are key factors in predicting the future responses of northern ecosystems to climate change.”
In addition to developing maps of near-surface permafrost distributions, the researchers developed maps of maximum thaw depth, or active-layer depth, and provided uncertainty estimates. Future permafrost distribution probabilities, based on future climate scenarios produced by the Intergovernmental Panel on Climate Change (IPCC), were also estimated by the USGS scientists. Widely used IPCC climate scenarios anticipate varied levels of climate mitigation action by the global community.
These future projections of permafrost distribution, however, did not include other possible future disturbances in the future, such as wildland fires. In general, the results support concerns about permafrost carbon becoming available to decomposition and greenhouse gas emission.Current probability of near-surface permafrost in Alaska. Future scenarios. (High resolution image)
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Piping plovers, a federally threatened species of shorebirds, are likely losing wetland breeding habitat in the Great Plains as a result of wetland drainage, climate change or both, according to a new U.S. Geological Survey study.
“Our findings suggest that if drainage continues, there will be continued declines in the amount of breeding habitat for piping plovers at wetlands in the Great Plains,” said Lisa McCauley, who led the study as a USGS postdoctoral student and currently works at The Nature Conservancy. “Managers can use information from our study to better restore and conserve valuable wetland ecosystems for the protection of this species.”
The USGS scientists analyzed piping plover survey data from 1979 to 2011 for 32 wetlands in the Prairie Pothole Region of North Dakota. They found that consolidation drainage, or the drainage of smaller wetlands into another wetland—typically for agricultural purposes—results in fewer and fuller wetlands with less shoreline nesting space for piping plovers.
According to the study, the probability of plover presence was 99.6 percent greater for wetlands located in undrained watersheds when compared to wetlands where 10 percent of the watershed was drained.
Piping plovers breed on wetland or reservoir shorelines and river sandbars in the northern Great Plains of the United States and Canada. Climate varies across this area, so when river or reservoir shorelines are flooded, unflooded prairie wetlands can provide habitat and vice versa. Consolidation drainage contributes to habitat loss for plovers by making wetlands fuller and shorelines smaller.
Like consolidation drainage, the fate of plover habitat is also tied to potential changes in climate. If precipitation increases in this region, the amount of wetland habitat for plovers could continue to decline.
“High and stable water levels resulting from consolidation drainage threaten biodiversity, wildlife habitat and flood storage in the northern Great Plains,” said Michael Anteau, a USGS scientist and team leader for the project. “This work on a federally listed species provides managers with a more complete view of ecosystem services affected by consolidation drainage.”
For more information on USGS ecosystems research in the Prairie Pothole Region, please visit the USGS Northern Prairie Wildlife Research Center website.
With the release of new US Topo maps for Illinois and South Dakota, the USGS has completed the second, three-year cycle of revising and updating electronic US Topo quadrangles. This means that since late 2009, the USGS has published nearly every map in the conterminous U.S., twice.
“The USGS and NGP are proud of our history and legacy of topographic mapping in the US,” said Mike Tischler, director of the USGS National Geospatial Program. “This latest cycle of US Topo production is a testament to the professionalism and capability of our staff and keeps that legacy alive. We've revised more than 110,000 maps in the last six years to include higher quality data across the country, and have been able to deliver those maps in an easy to use format to suit the diverse needs of our users. While reaching the end of the second-cycle is an important achievement, we look forward to the next cycle of US Topo production, and investigating emerging technologies to better serve the needs of the country.”
In the past 12 months, the production staff of the NGP has updated, revised and loaded 18,767 US Topo quads covering 18 states. That equates to the assembly, inspection and loading of nearly 75 maps per working day. Additionally, the staff created more than 635 new 1:24,000 scale maps for Alaska, as part of the Alaska Mapping Initiative. All of the new US Topo maps are digital and offered for free download, as the USGS no longer prints topographic maps using traditional printing technologies.
Other improvements to the state maps in the second-cycle include the inclusion of National Scenic Trails, “crowdsourced” trail data from the International Mountain Bike Association, increased parcel land data (PLSS), and most recently, trail data from the U.S. Forest Service.
The complete new map sets for Illinois and South Dakota join Maine, Alabama, Arizona, Nebraska, Nevada, Missouri, California, Louisiana, Mississippi, New Hampshire, Vermont, Connecticut, Massachusetts, Rhode Island, Wyoming, and Florida as revised states for fiscal year 2015.
All of these new US Topo maps replace the first edition US Topo maps and are available for no-cost file download from The National Map, the USGS Map Locator & Downloader website , and several other USGS applications.
The first three-year production cycle ended in September 2012, and the second cycle ended in September 2015.
To compare change over time, scans of legacy USGS topo maps, some dating back to the late 1800s, can be downloaded from the USGS Historical Topographic Map Collection.
Find more information on US Topo maps online.This graphic represents the planned US Topo map production schedule for the next three- year revision cycle. The US Topo project repackages data from national GIS (geographic Information system) databases as traditional maps, primarily for the benefit of non-GIS users. Unlike traditional topographic maps, US Topo maps are mass-produced from secondary sources, on a programmed refresh cycle, using the best available data at the time of production. (high resolution image 1.96 MB) As a result of the inclusion of selected National Scenic Trail data on the US Topo maps, 13 state map series now feature National Scenic Trails, and more will be added in the coming months. These trails have been established by Congress to provide for maximum outdoor recreation potential and for the conservation and enjoyment of nationally significant scenic, historic, natural, and cultural qualities of the area through which such trails may pass.
There are 11 National Scenic Trails:
- Appalachian National Scenic Trail
- Pacific Crest National Scenic Trail
- Continental Divide National Scenic Trail
- North Country National Scenic Trail
- Ice Age National Scenic Trail
- Potomac Heritage National Scenic Trail
- Natchez Trace National Scenic Trail
- Florida National Scenic Trail
- Arizona National Scenic Trail
- New England National Scenic Trail
- Pacific Northwest National Scenic Trail
More than 180 million metric tons of undiscovered copper resources may be found in an area of the Middle East that covers Turkey, Georgia, Armenia, Azerbaijan, Iran, western Pakistan and southwestern Afghanistan, according to a recent assessment by the U.S. Geological Survey. This estimate is ten times the current annual world production for copper.
This region, the site of the ancient Tethys Sea, has a long history of mining copper, producing 420,000 metric tons in 2011 alone.
“In an area known more for its oil, there’s a bounty of a mineral both critically and strategically important to the world’s economy,” said Larry Meinert, Program Coordinator of the USGS Mineral Resources Program. “Copper plays a vital role in all parts of our lives, from our coinage to musical instruments to our high-end electronics.”
This copper assessment is a synthesis of available information about where copper mineral deposits are known and suspected in the Earth’s crust and estimates of amounts of copper that may be present in undiscovered deposits. This assessment is part of a broader effort at assessing global mineral resources. Global totals of copper are estimated to be about 3,600 million metric tons of undiscovered resources.
Copper is an important resource in the United States. In 2014, the United States consumed about 1.8 million metric tons of copper, while global consumption tallied about 20 million metric tons.
The United States currently has about 35 million metric tons of copper reserves, with an estimated 550 million metric tons in estimated undiscovered resources. The country with the largest reserves is Chile, with 209 million metric tons of reserves in 2014.
Copper plays a significant role in many parts of the U.S. economy. Its more common uses are in power generation and transmission, as well as electronics, such as smartphones. It’s also prominent in automobiles, with the average car containing nearly a mile of copper wiring.
Some of copper’s less-known but still important roles are its use in frequently touched surfaces (such as brass doorknobs), where copper’s antimicrobial properties reduce the transfer of germs and disease. It’s also used quite extensively in alloys with other metals, such as the brass in musical instruments or the copper-nickel alloy used to prevent barnacles from attaching to ship hulls.
This assessment can be found online. The USGS Mineral Resources Program delivers unbiased science and information to understand mineral resource potential, production, consumption, and how minerals interact with the environment. To keep up-to-date on USGS mineral research, follow us on Twitter!A map of the area covered in the assessment. Figure Credit: USGS (High resolution image)
The image shows one of many possible badge designs. The final design will be selected in the coming months.(High resolution image)
Using crowdsourcing techniques, the USGS project known as The National Map Corps (TNMCorps) encourages volunteer “citizen scientists” to collect manmade structure data such as police stations, schools, hospitals and cemeteries, in an effort to provide more precise and authoritative spatial data for the USGS web-based mapping portal known as The National Map.
In celebration of these common passions and in honor of GIS Day and International Map Year, TNMCorps is encouraging volunteers to edit 2,016 features between GIS Day 2015 and GIS Day 2016. Each of those submitted edits are worth a point. Volunteers who contribute 2,016 edits and thus earning 2,016 points between November 18, 2015 and November 16, 2016 will be awarded with a special edition collectable embroidered patch.
“We’re excited about this ambitious challenge to our current and new National Map Corps members,” said Julia Fields, Deputy Director of the USGS National Geospatial Program, “and we are looking forward to seeing the patches on backpacks and jackets!”
Volunteer map editors are a fundamental component of TNMCorps and are critical to the success of the project. The project started in 2012, and since that time, an increasing number of volunteers have verified, edited, deleted, and created more than 160,000 structures points.
Volunteering for TNMCorps is a great way for folks to get involved in building maps for their communities and the nation. Volunteers not only increase their geographic knowledge through the process, they make a significant contribution to the nation’s wealth of publicly available geographic information. TNMCorps volunteers are some of the many individuals who share a passion for geography, cartography and collaborative mapping initiatives.
"Having a patch to display my contribution to The National Map would be the perfect incentive for me to reach 2,016 submissions,” said Mattson Fields, a volunteer patch designer. “What a great way to break the ice and introduce The National Map Corps to friends and acquaintances."
All you need is access to the internet and willingness to learn. If you are interested in becoming a Volunteer Map Editor and/or participating in this initiative, please visit The National Map Corps for more information.
Follow progress and updates at The National Map Twitter #TNMCorps, @gisday, @mapyear