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| Titel |
Atmospheric impacts on climatic variability of surface incident solar radiation |
| VerfasserIn |
K. C. Wang, R. E. Dickinson, M. Wild, S. Liang |
| 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 ; 12, no. 20 ; Nr. 12, no. 20 (2012-10-22), S.9581-9592 |
| Datensatznummer |
250011523
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| Publikation (Nr.) |
 copernicus.org/acp-12-9581-2012.pdf |
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| Zusammenfassung |
| The Earth's climate is driven by surface incident solar radiation
(Rs). Direct measurements have shown that Rs has undergone
significant decadal variations. However, a large fraction of the global land
surface is not covered by these observations. Satellite-derived Rs has a
good global coverage but is of low accuracy in its depiction of decadal
variability. This paper shows that daily to decadal variations of Rs,
from both aerosols and cloud properties, can be accurately estimated using
globally available measurements of Sunshine Duration (SunDu). In particular,
SunDu shows that since the late 1980's Rs has brightened over Europe due
to decreases in aerosols but dimmed over China due to their increases. We
found that variation of cloud cover determines Rs at a monthly scale but
that aerosols determine the variability of Rs at a decadal time scale,
in particular, over Europe and China. Because of its global availability and
long-term history, SunDu can provide an accurate and continuous proxy record
of Rs, filling in values for the blank areas that are not covered by
direct measurements. Compared to its direct measurement, Rs from SunDu
appears to be less sensitive to instrument replacement and calibration, and shows
that the widely reported sharp increase in Rs during the early 1990s
in China was a result of instrument replacement. By merging direct measurements collected by Global
Energy Budget Archive with those derived from SunDu, we obtained a good
coverage of Rs over the Northern Hemisphere. From this data, the average
increase of Rs from 1982 to 2008 is estimated to be 0.87 W m−2 per
decade. |
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