Clean Air Status and Trends Network (CASTNET) deposition, summary report (1987--1995). Technical report
The National Dry Deposition Network (NDDN) was established in 1986 to provide long term estimates of dry deposition across the continental United States. In 1990, NDDN was incorporated into the Clean Air Status and Trends Network (CASTNET) which was created to address the requirements of the Clean Air Act Amendments (CAAA). Approximately 50 sites were operational from 1989 through 1995 with the majority of the sites located in rural eastern United States. Each site is equipped with sensors for continuous measurements of ozone and meteorological variables required for the estimation of dry deposition rates. Weekly average concentrations of particulate sulfate (SO{sub 4}), particulate nitrate (NO{sub 3{minus}}), particulate ammonium (NH{sub 4+}), sulfur dioxide (SO{sub 2}), and nitric acid (HNO{sub 3}) were measured at all sites. Precipitation samples were collected at selected sites and analyzed for acidity and related species in order to estimate wet deposition. Under the CASTNET program, a visibility monitoring network and a Mountain Acid Deposition Program (MADPro) were established. This report summaries the analysis and interpretation of NDDN and CASTNET measurements taken from 1987 through 1995. The extensive database of concentrations and calculated dry, wet, and total depositions have been analyzed.
- Research Organization:
- QST Environmental, Inc., Gainesville, FL (United States); Environmental Protection Agency, Atmospheric Research and Exposure Assessment Lab., Research Triangle Park, NC (United States)
- Sponsoring Organization:
- Environmental Protection Agency, Washington, DC (United States)
- OSTI ID:
- 676012
- Report Number(s):
- PB-98-150097/XAB; CNN: Contract EPA-68-02-4451; Contract EPA-68-D2-0134; TRN: 83002164
- Resource Relation:
- Other Information: PBD: Jul 1998
- Country of Publication:
- United States
- Language:
- English
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