Trends in emissions and acid deposition over the northeastern US: Measurements and modeling
Abstract
In recent years, two large emissions reduction programs have taken place in and upwind of the Northeastern United States: the Acid Rain Program and the NOx SIP (State Implementation Plan) call. Other programs have been directed toward reducing emissions from mobile sources, and new programs such as the CAIR rule (Clean Air Interstate Rule) are coming on line, pushing emissions down even further. Trends in the emissions data to date suggest that the benefits of these programs should already be measurable using existing monitoring data. A brief analysis of acid deposition data from several sites around the region indicates that the trends in sulfate are all downward, while the trends in nitrate deposition are less dramatic, with a promising recent downward trend. The CMAQ (Community Multiscale Air Quality) model - a one-atmosphere urban/regional smog, aerosol, and deposition model - has been used to estimate future trends in deposition with the implementation of new programs expected to come on line in the next several years.
- Publication:
-
AGU Spring Meeting Abstracts
- Pub Date:
- May 2006
- Bibcode:
- 2006AGUSM.A51C..05S
- Keywords:
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- 0305 Aerosols and particles (0345;
- 4801;
- 4906);
- 0320 Cloud physics and chemistry;
- 0322 Constituent sources and sinks;
- 0345 Pollution: urban and regional (0305;
- 0478;
- 4251);
- 0368 Troposphere: constituent transport and chemistry