The influence of increased jet airline traffic on the amountof high level cloudiness in Alaska |
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Authors: | S Nakanishi J Curtis G Wendler |
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Institution: | (1) Geophysical Institute of the University of Alaska, Fairbanks, Alaska, USA, US |
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Abstract: | Summary The high level cloudiness has increased over Alaska during the second half of this century, a period for which reliable data
exist. This increase is most pronounced in areas close to the much traveled air routes from Europe to Anchorage which could
be demonstrated by a comparison with two remote stations in western Alaska. This might be taken as an indication that the
observed high cloudiness increase is caused by jet contrails. Seasonally, summer and spring give the greatest increases. Cloudiness
is, of course, an important parameter for climatic change, and increased high level cloud amount in arctic and subarctic areas
would lead to warmer temperature; these have been observed in Alaska.
Received May 11, 2000 Revised November 17, 2000 |
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