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| Titel |
Long-term trends in solar radiation and the associated climatic factors over China for 1961-2000 |
| VerfasserIn |
F. Liang, X. A. Xia |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 7 ; Nr. 23, no. 7 (2005-10-14), S.2425-2432 |
| Datensatznummer |
250015317
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| Publikation (Nr.) |
 copernicus.org/angeo-23-2425-2005.pdf |
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| Zusammenfassung |
Long-term trends in downwelling solar irradiance and associated climatic
factors over China are studied in the paper. Decreasing trends in global and
direct radiation are observed over much of China. The largest decrease
occurs in South and East China (east of about 100° E and south of about
40° N). The spatial pattern of observed trends in diffuse irradiance is
complex and inhomogeneous. An intriguing aspect of trends in global and
direct irradiance is the rather abrupt decrease in annual and seasonal mean
values from 1978 onward. The decreasing trends in solar radiation in China did
not persist into the 1990s. The spatial and temporal patterns of trends in
sunshine duration are consistent with that of global and direct irradiance.
A decreasing trend in rainy days is observed over much of China, which is in
agreement with the secular trend in cloud amount. The fact that trends in
cloud amount and solar radiation are quite similar suggests that the cloud amount is
not the primary cause for the decrease in solar radiation. Visibility in the eastern
part of China has deteriorated heavily as a result of the rapid increase in aerosol
loading. The statistical analysis showed that atmospheric transmission under
clear conditions decreased rapidly. These facts suggest that the rapid
increase in aerosol loading should be one of the principle causes for the
decrease in solar radiation. The observed diurnal temperature range
decreases remarkably in China, which is closely related to the increase in
aerosols. The effects of anthropogenic air pollutants on climate should be
further studied and included in the simulation of climate and projection of
climate scenario.
Keywords. Atmospheric composition and structure
(Aerosol and particles; General or miscellaneous) – Meteorology
and atmospheric dynamics (Radiative processes) |
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