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| Titel |
Spatiotemporal variability analysis of diffuse radiation in China during 1981–2010 |
| VerfasserIn |
X. L. Ren, H. L. He, L. Zhang, L. Zhou, G. R. Yu, J. W. Fan |
| 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 ; 31, no. 2 ; Nr. 31, no. 2 (2013-02-19), S.277-289 |
| Datensatznummer |
250017756
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| Publikation (Nr.) |
 copernicus.org/angeo-31-277-2013.pdf |
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| Zusammenfassung |
| Solar radiation is the primary driver of terrestrial plant photosynthesis
and the diffuse component can enhance canopy light use efficiency (LUE), which in turn influences the carbon balance of terrestrial ecosystems. In this study
we calculated the spatial data of diffuse radiation in China from 1981 to
2010, using a radiation decomposition model and spatial interpolation
method based on observational data. Furthermore, we explored the
spatiotemporal characteristics of diffuse radiation using GIS and trend
analysis techniques. The results show the following: (1) The spatial patterns of
perennial average of annual diffuse radiation during 1981–2010 are complex
and inhomogeneous in China, generally lower in the north and higher in the
south and west. The perennial average ranges from 1730.20 to 3064.41 MJ m−2 yr−1
across the whole country. (2) There is an increasing
trend of annual diffuse radiation in China from 1981 to 2010 on the whole,
with mean increasing amplitude of 7.03 MJ m−2 yr−1 per decade.
Whereas a significant downtrend was observed in the first 10 years,
distinct anomalies in 1982, 1983, 1991 and 1992 occurred due to the
eruptions of El Chinchon and Pinatubo. (3) The spatial distribution of the
temporal variability of diffuse radiation showed significant regional
heterogeneity in addition to the seasonal differences. Northwestern China
has the most evident downtrend, with highest decreasing rate of 6% per
decade, while the Tibetan Plateau has the most evident uptrend, with highest
increasing rate of up to 9% per decade. Such quantitative spatiotemporal
characteristics of diffuse radiation are essential in regional scale
modeling of terrestrial carbon dynamics. |
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