Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 19 April 1985:
Vol. 228. no. 4697, pp. 275 - 284
DOI: 10.1126/science.228.4697.275
Prev | Table of Contents | Next

Articles

Pollution Aerosol in the Northeast: Northeastern-Midwestern Contributions

Kenneth A. Rahn 1 and Douglas H. Lowenthal 1

1 Center for Atmospheric Chemistry Studies, Graduate School of Oceanography, University of Rhode Island, Narragansett 02882

In recent years, atmospheric scientists have been endeavoring to determine the relative contributions of local and distant sources to pollution aerosol in eastern North America. Elemental analysis of aerosol from various sites in the northeastern United States has revealed a persistent northeastern "foreground" upon which pulses of midwestern aerosol are superimposed every few days, in response to large-scale meteorological features. Regional apportionment of tracer element and sulfate in summer and winter samples from Narragansett, Rhode Island, and Underhill, Vermont, shows that most of the elements come predominantly from northeastern sources. Notable exceptions include arsenic and indium, for which Canadian nonferrous smelters are important sources, and sulfur and selenium, for which the Midwest is an important source. During 1982 and 1983, the Northeast and the Midwest contributed comparably to aerosol sulfate at Narragansett and Underhill, in spite of the fact that the emissions of sulfur dioxide in the Midwest were ten times those in the Northeast; Canadian smelters accounted for less than 10 percent of the total sulfate. During a major pollution episode in July 1982, northeastern and midwestern sources produced comparable sulfate concentration in Rhode Island, whereas midwestern sources dominated northeastern sources in Vermont. Thus, although distant midwestern sources affect the quantity of pollution aerosol in the Northeast and may dominate episodically, nearer northeastern sources are comparably important on the long term.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Acid Deposition: Unraveling a Regional Phenomenon.
S. E. Schwartz (1989)
Science 243, 753-763
   Abstract »    PDF »
Effects of Acid Rain on Freshwater Ecosystems.
D. W. Schindler and D. W. SCHINDLER (1988)
Science 239, 149-157
   Abstract »    PDF »
Chemical Wastes in our Atmosphere--An Ecological Crisis.
G. E. Likens (1987)
Organization Environment 1, 13-33
   Abstract »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)