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| Titel |
Is there a trend in cirrus cloud cover due to aircraft traffic? |
| VerfasserIn |
F. Stordal, G. Myhre, E. J. G. Stordal, W. B. Rossow, D. S. Lee, D. W. Arlander, T. Svendby |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 5, no. 8 ; Nr. 5, no. 8 (2005-08-11), S.2155-2162 |
| Datensatznummer |
250003032
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| Publikation (Nr.) |
 copernicus.org/acp-5-2155-2005.pdf |
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| Zusammenfassung |
| Trends in cirrus cloud cover have been estimated based on 16 years of data
from ISCCP (International Satellite Cloud Climatology Project). The results
have been spatially correlated with aircraft density data to determine the
changes in cirrus cloud cover due to aircraft traffic. The correlations are
only moderate, as many other factors have also contributed to changes in
cirrus. Still we regard the results to be indicative of an impact of
aircraft on cirrus amount. The main emphasis of our study is on the area
covered by the METEOSAT satellite to avoid trends in the ISCCP data
resulting from changing satellite viewing geometry. In Europe, which is
within the METEOSAT region, we find indications of a trend of about 1-2%
cloud cover per decade due to aircraft, in reasonable agreement with
previous studies. The positive trend in cirrus in areas of high aircraft
traffic contrasts with a general negative trend in cirrus. Extrapolation in
time to cover the entire period of aircraft operations and in space to cover
the global scale yields a mean estimate of 0.03 Wm-2 (lower limit 0.01,
upper limit 0.08 Wm-2) for the radiative forcing due to aircraft
induced cirrus. The mean is close to the value given by IPCC (1999) as an
upper limit. |
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