National Atmospheric Deposition Program

Project Description
The National Atmospheric Deposition Program (NADP) was started in 1977
under the State Agricultural Experiment Stations (SAES) to address the
problem of atmospheric deposition and its effect on agricultural
crops, forests, rangelands, surface waters and other natural and
cultural resources. The first monitoring sites of the NADP precipitation
chemistry network was started in 1978 to provide information about
geographical patterns and temporal trends in the deposition of acidic
chemicals and nutrients. The NADP was initially organized as Regional
Project NC-141 by the North Central Region of the SAES. The NADP was
endorsed by all four regions in 1982. when it became Interregional
Project IR-7. Ten years later IR-7 was reclassified as a National
Research Support Project, NRSP-3.

In 1982, the National Acid Precipitation Assessment Program (NAPAP)
was established. The NADP assumed responsibility for coordinating the
National Trends Network (NTN) of NAPAP since both the NADP and NTN had
common siting criteria and operational procedures, and shared a common
analytical laboratory. In 1983, the network became the NADP/NTN.
Seven federal agencies support NADP/NTN research and monitoring under
NAPAP: Department of Agriculture (USDA) [Agricultural Research Service
(USDA/ARS), Cooperative Sate Research, Education and Extension Service
(USDA/CSREES), and the U.S. Forest Service (USFS)]; Department of
Commerce (DOC) [National Oceanic and Atmospheric Administration
(NOAA)]; Department of Energy (DOE) [Argonne National Laboratory
(ANL), Los Alamos National Laboratory (LANL), and Oak Ridge National
Laboratory (ORNL)]; Department of Interior (DOI) [Bureau of Land
Management (BLM), USGS Biological Resources Division (BRD) (formally
the National Biological Service (NBS)), National Park Service (NPS),
U.S. Fish and Wildlife Service (USFWS), U.S. Geological Survey (USGS),
and the USGS Branch of Technical Development and Quality Systems];
Environmental Protection Agency (EP); National Aeronautics and Space
Administration (NASA) and the National Science Foundation (NSF).
Additional support is provided by various other federal agencies,
state agencies, universities, public utilities and industry. There are
curently 200 sites in the network.

The primary objectives of the NADP/NTN network are the determination
of spatial patterns and temporal trends in chemical deposition on
terrestrial ecosystems. The Central Analytical Laboratory (CAL),
operated by the Illinois State Water Survey is responsible for the
chemical analysis and related support services for the entire network.
The NADP/NTN Coordination Office was transferred to the Illinois State
Water Survey in 1998 from Colorado State University. The NADP/NTN
also has two subnetworks: the Atmospheric Integrated Research
Monitoring Network (AIRMoN) - designed to characterize long-term
trends in the chemical climate of the U.S.; and the Mercury Deposition
Network (MDN) - designed to develop a regional database on the weekly
concentrations of total mercury in precipitation and the seasonal and
annual flux of total mercury in wet deposition.

Data from the NADP/NTN is available on-line at: Reference: National Atmospheric Deposition
Program. 1993. 'NADP/NTN Annual Data Summary. Precipitation Chemistry
in the United States. 1992', Natural Resource Ecology Laboratory,
Colordao State University, Fort Collins, CO. 480 pp. Lynch, J.A.,
V.C. Bowersox, and C. Simmons. 1995. "Precipitation Chemistry Trends
in the United States: 1980-1993. Summary Report", NADP, Natural
resources Ecology Laboratory, Colorado State University, Fort
Collins, CO. 103 pp. Data Availability: The NADP/NTN data are
available as weekly, annual, seasonal, monthly summaries of
precipitation amounts, ion concentrations and depositions in hardcopy
or electronic form from NREL.