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Detailed Reference Information |
Bidleman, T.F., Jantunen, L.M., Falconer, R.L., Barrie, L.A. and Fellin, P. (1995). Decline of hexachlorocyclohexane in the Arctic atmosphere and reversal of air-sea gas exchange. Geophysical Research Letters 22: doi: 10.1029/94GL02990. issn: 0094-8276. |
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Hexachlorocyclohexanes (HCHs) are the most abundant organochlorine persticides in the arctic atmosphere and ocean surface water. A complication of measurements made between 1979--93 from stations in the Canadian and Norwegian Arctic and from cruises in the Bering and Chukchi seas indicates that atmospheric concentrations of &agr;-HCH have declined significantly (p<0.01), with a time for 50% decrease of about 4 y in summer-fall and 6 y in winter-spring. The 1992--93 levels of about 100 pg m-3 are 2--4 fold lower than values in the mid-1980s. The trend in &ggr;-HCH is less pronounced, but a decrease is also suggested from measurements in the Canadian Arctic and the Bering-Chukchi seas. HCHs in ocean surface water have remained relatively constant since the early 1980s. The decline in atmospheric &agr;-HCH has reversed the net direction of air-sea gas exchange to the point where some northern waters are now sources of the pesticide to the atmosphere instead of sinks. ¿ American Geophysical Union 1995 |
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Abstract |
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Keywords
Meteorology and Atmospheric Dynamics, Ocean/atmosphere interactions (0312, 4504) |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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