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.
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.
Atmospheric Deposition Program of the U.S. Geological Survey
Operational protocol for a recording precipitation monitor : Manual for Task Group G Site Operations, National Atmospheric Precipitation Assessment Program
Experimental chemical weathering of various bedrock types at different pH-values. 1. Sandstone and granite
Trend analysis of weekly acid rain data, 1978-83
Preparation of polyethylene sacks for collection of precipitation samples for chemical analysis
Precision of the measurement of pH and specific conductance at National Atmospheric Deposition Program monitoring sites, October 1981-November 1983
Precision and bias of selected analytes reported by the National Atmospheric Deposition Program and National Trends Network, 1983; and January 1980 through September 1984
Interlaboratory comparability, bias, and precision for four laboratories measuring constituents in precipitation, November 1982-August 1983
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.