National Atmospheric Deposition Program (NADP) Active
National Atmospheric Deposition Program (NADP)
NADP is a multi-partner atmospheric monitoring program that measures concentrations and deposition of atmospheric constituents across North America
The National Atmospheric Deposition Program (NADP) is a multi-partner atmospheric monitoring program that measures the concentrations and deposition of atmospheric constituents across North America. The USGS has been an NADP partner agency since 1981 and participates by providing funds for 72 National Trend Network (NTN) sites.
Linking transit times to catchment sensitivity in western U.S.
Short transit times—the time between entry of a water molecule into the ground surface and when it exits the catchment—is a key reason why western U.S. high-elevation catchments are highly sensitive to atmospheric pollution and climate change.
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The National Atmospheric Deposition Program (NADP) monitors precipitation chemistry through five monitoring networks. USGS supports monitoring sites within the National Trends Network and the Mercury Deposition Network.
The National Atmospheric Deposition Program (NADP) operates five monitoring networks for various constituents of which the National Trends Network (NTN) is the largest with 263 sites where the major ions in precipitation are measured weekly. The U.S. Geological Survey (USGS) has been an NADP partner agency since 1981 and participates by providing funds for 72 NTN sites.
► More about the NADP data, program, and networks
Data from the NADP networks are used to track trends and examine spatial patterns in atmospheric deposition of constituents that include nitrogen, sulfur, mercury, calcium, and others. Many of these constituents are naturally present in the atmosphere but also originate in part as air pollutant emissions from human activities such as from power plants and vehicles. Clean air policies implemented under the Clean Air Act, as part of global treaties, and by other regulations typically set targets for reducing emissions, which are tracked by NADP measurements. In this manner, there is a close link between science, policy, and management among NADP partners. The identical field sampling protocols and equipment and analyses by one laboratory using the same methods facilitates comparisons across sites and highlights the value of a multi-partner monitoring program.
Below are data or web applications associated with National Atmospheric Deposition Program (NADP).
Since 1985, the NADP has created annual gradient maps of precipitation-weighted mean concentrations and deposition for several different parameters.
Slider maps showing the 2018 to 1985 difference in concentrations and deposition for pH, sulfate, and nitrogen are linked below. You can use the slider to compare the two years side by side, or view either year in full.
Scientists use National Atmospheric Deposition Program (NADP) data to investigate nitrogen sources to watersheds and estuaries, ecosystem effects of pollutant deposition, and results of implementation of clean air policies.
Atmospheric Deposition Program of the U.S. Geological Survey
Updated operational protocols for the U.S. Geological Survey Precipitation Chemistry Quality Assurance Project in support of the National Atmospheric Deposition Program
Response of fish assemblages to declining acidic deposition in Adirondack Mountain lakes, 1984–2012
Climate-change signals in national atmospheric deposition program precipitation data
Evaluation of National Atmospheric Deposition Program measurements for colocated sites CO89 and CO98 at Rocky Mountain National Park, water years 2010–14
External quality assurance project report for the National Atmospheric Deposition Program’s National Trends Network and Mercury Deposition Network, 2013–14
Dragonfly Mercury Project—A citizen science driven approach to linking surface-water chemistry and landscape characteristics to biosentinels on a national scale
Isotopes in North American Rocky Mountain snowpack 1993–2014
Mercury and methylmercury in reservoirs in Indiana
Assessment of the use of sorbent amendments for reduction of mercury methylation in wetland sediments at Acadia National Park, Maine
Mercury in the nation's streams - Levels, trends, and implications
The relative importance of oceanic nutrient inputs for Bass Harbor Marsh Estuary at Acadia National Park, Maine
Estimates of inorganic nitrogen wet deposition from precipitation for the conterminous United States, 1955-84
The National Atmospheric Deposition Program (NADP) is a multi-partner atmospheric monitoring program that measures the concentrations and deposition of atmospheric constituents across North America. The USGS has been an NADP partner agency since 1981 and participates by providing funds for 72 National Trend Network (NTN) sites.
Linking transit times to catchment sensitivity in western U.S.
Short transit times—the time between entry of a water molecule into the ground surface and when it exits the catchment—is a key reason why western U.S. high-elevation catchments are highly sensitive to atmospheric pollution and climate change.
Quick Links
The National Atmospheric Deposition Program (NADP) monitors precipitation chemistry through five monitoring networks. USGS supports monitoring sites within the National Trends Network and the Mercury Deposition Network.
The National Atmospheric Deposition Program (NADP) operates five monitoring networks for various constituents of which the National Trends Network (NTN) is the largest with 263 sites where the major ions in precipitation are measured weekly. The U.S. Geological Survey (USGS) has been an NADP partner agency since 1981 and participates by providing funds for 72 NTN sites.
► More about the NADP data, program, and networks
Data from the NADP networks are used to track trends and examine spatial patterns in atmospheric deposition of constituents that include nitrogen, sulfur, mercury, calcium, and others. Many of these constituents are naturally present in the atmosphere but also originate in part as air pollutant emissions from human activities such as from power plants and vehicles. Clean air policies implemented under the Clean Air Act, as part of global treaties, and by other regulations typically set targets for reducing emissions, which are tracked by NADP measurements. In this manner, there is a close link between science, policy, and management among NADP partners. The identical field sampling protocols and equipment and analyses by one laboratory using the same methods facilitates comparisons across sites and highlights the value of a multi-partner monitoring program.
Below are data or web applications associated with National Atmospheric Deposition Program (NADP).
Since 1985, the NADP has created annual gradient maps of precipitation-weighted mean concentrations and deposition for several different parameters.
Slider maps showing the 2018 to 1985 difference in concentrations and deposition for pH, sulfate, and nitrogen are linked below. You can use the slider to compare the two years side by side, or view either year in full.
Scientists use National Atmospheric Deposition Program (NADP) data to investigate nitrogen sources to watersheds and estuaries, ecosystem effects of pollutant deposition, and results of implementation of clean air policies.