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Science 5 March 1993:
Vol. 259. no. 5100, pp. 1436 - 1439
DOI: 10.1126/science.259.5100.1436
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Articles

Export of North American Ozone Pollution to the North Atlantic Ocean

David D. Parrish 1, John S. Holloway 1, Michael Trainer 1, Paul C. Murphy 1, Fred C. Fehsenfeld 1, and Gerry L. Forbes 2

1 Aeronomy Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80303
2 Atmospheric Environment Service—Sable Island, 1496 Bedford Highway, Bedford, Nova Scotia B4A 1E5, Canada

Measurement of the levels of ozone and carbon monoxide (a tracer of anthropogenic pollution) at three surface sites on the Atlantic coast of Canada allow the estimation of the amount of ozone photochemically produced from anthropogenic precursors over North America and transported to the lower troposphere over the temperate North Atlantic Ocean. This amount is greater than that injected from the stratosphere, the primary natural source of ozone. This conclusion supports the contention that ozone derived from anthropogenic pollution has a hemisphere-wide effect at northern temperate latitudes.

Submitted on August 25, 1992
Accepted on December 24, 1992


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