NADPNTNinNC summary Sep2015 - Nc State University efforts!of!the!NADP!NTN!inNorthCarolina, ! Title...

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Transcript of NADPNTNinNC summary Sep2015 - Nc State University efforts!of!the!NADP!NTN!inNorthCarolina, ! Title...

  • June 2015


    National Atmospheric Deposition Program National Trends Network (NADP NTN) in North Carolina

    The mission of the National Atmospheric Deposition Program (NADP) is to characterize the chemical climate in the United States, with an emphasis on current status and long-term trends. The NADP National Trends Network (NTN) of the NADP monitors precipitation chemistry, providing a measure of the removal of air pollutants from the atmosphere by deposition; just as importantly, it measures the addition of chemical compounds to the biosphere in the form of acidic ions, essential nutrients, and base cations. In part because of NC State Universitys involvement in helping to create NADP in 1977, five sites in North Carolina were among the first NTN sites established and have now collected more than 36 years of continuous, high-quality data.

    NADP is a cooperative research program funded by federal, state, tribal, local, and private-sector organizations. Currently, the NTN has 266 monitoring sites in the US that measure free acidity (H+ as pH), conductance, calcium (Ca2+), magnesium (Mg2+), sodium (Na+), potassium (K+), sulfate (SO42-), nitrate (NO3-), chloride (Cl-), and ammonium (NH4+) in wet deposition. Precipitation samples are collected weekly and shipped to a Central Analytical Laboratory at the Illinois State Water Survey for chemical analysis and quality assurance. All NTN data are made available at

    NADP NTN provides an inexpensive means to monitor changes in the chemical climate of NC and other states. The longevity of the data record, which started in 1978, and consistent data quality assurance make the NTN data a uniquely valuable resource. Data on the pH and ion concentrations in rain and snow are widely used to indicate changes in regional emissions as a result of changing emission sources, to detect geographic and temporal trends in air quality, to estimate atmospheric inputs to terrestrial and aquatic ecosystems, and as input to air quality, water quality, and ecosystem management models (e.g., Bash et al., 2012, Biogeosciences Discussions 9(8), 11375-11401; Tilak et al., 2014, JAWRA 50(3), 665-682). One of the primary data products of NADP is a series of national maps displaying isopleths of annual concentration and deposition of analytes measured by the network (shown above; lib/data/2013as.pdf). NADP NTN data are freely available and used by scientists, land managers, educators, students, policymakers, and the public in North Carolina, the US, and abroad. In 2013, 208 publications that used or compared NADP data were published (

    Active NADP National Trends Network sites in and near North Carolina. NCSU-coordinated sites are indicated in red.

  • June 2015


    Long-term data on precipitation chemistry and deposition from NADP are extensively used in simulations using advanced numerical modeling (e.g., Liu et al., 2010, Atmospheric Environment 44, 2443-2456), which can address uncertainties in future climate change projections identified as a top priority by the National Research Council and IPCC. Long-term data are also critical components in the development of new Earth system models that integrate knowledge about the atmosphere, biosphere, hydrosphere, and lithosphere.

    There are currently ten active NADP NTN sites in North Carolina in all three physiographic regions of the state. Because NADP uses a cooperative funding structure, sites in the national network are supported by many different agencies and organizations, and this holds true in NC. Four sites in NC are each sponsored solely by a different federal agency. NC State University has coordinated support for four to six sites since 1978. Recent funding for the two major aspects of site support costs for shipping and analysis of precipitation samples and costs for site operator and infrastructure are shown below.

    NADP NTN sites in North Carolina (*denotes site for which NCSU coordinates support)

    Site ID Site Name County River Basin Eleva-tion (m)

    Start Date Current Funding Source for Both Sample Analysis / Site Operation

    Mountain Region NC25 Coweeta Macon Little

    Tennessee 686 7/5/1978 USDA Forest Service / USDA Forest Service

    NC45* Mt. Mitchell* Yancey French Broad

    1987 11/26/1985 NC State University / US Environmental Protection Agency

    Piedmont Region NC17 University Res.

    Farm Guilford Cape Fear 238 1/30/2015 US Dept of Energy / NC A&T University

    NC34* Piedmont Res. Station*

    Rowan Yadkin 219 10/17/1978 NC State University / NC Dept of Agriculture & Consumer Services

    NC41* Finley Farm* Wake Neuse 120 10/3/1978 NC State University / US Department of Agriculture

    Coastal Plain Region NC03* Lewiston* Bertie Roanoke 22 10/31/1978 NC State University / NC Dept of Agriculture

    & Consumer Services NC06 Beaufort Carteret Neuse 2 1/26/1999 US Environmental Protection Agency / US

    Environmental Protection Agency NC29* Hofmann

    Forest* Onslow White Oak 14 7/2/2002 NC State University & NC Natural Resources

    Foundation / NC Natural Resources Foundation

    NC35* Clinton Crops Res. Station*

    Sampson Cape Fear 41 10/24/1978 NC State University / NC Dept of Agriculture & Consumer Services

    NC36 Jordan Creek Scotland Lumber 132 10/18/1983 US Geological Survey / US Geological Survey

    Other organizations that have supported the NCSU-coordinated sites over the past 37 years include US Geological Survey, Carolina Power and Light Company, Duke Power Company (both now Duke Energy), NC Agricultural Research Service, and Division of Air Quality in the NC Dept. of Environment and Natural Resources. NC State University has developed the North Carolina Atmospheric Chemistry Consortium, which provides a framework for multiple stakeholders to join as contributing members to support the important atmospheric deposition monitoring efforts of the NADP NTN in North Carolina,