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| Titel |
From brightening to dimming in sunshine duration over the eastern and central Tibetan Plateau (1961-2005) |
| VerfasserIn |
Qinglong You, Shichang Kang, Wolfgang-Albert Flügel, Arturo Sanchez-Lorenzo, Yuping Yan, Javier Martin-Vide |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044248
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| Zusammenfassung |
| The Tibetan Plateau (TP) with an average elevation of over 4000 m a.s.l. is the highest and
most extensive highland in the world. We used monthly mean sunshine duration from
the Chinese Meteorological Administration to examine the spatial and temporal
variability of sunshine duration at 71 stations in the eastern and central TP during the
1961-2005 period. The temporal evolution of the mean annual sunshine duration
series shows a significant increase from 1961 to 1982 at a rate of 49.8 h/decade,
followed by a decrease from 1983 to 2005 at a rate of -65.1h/decade, with an overall
significant decrease at a rate of -20.6 h/decade during the whole 1961-2005 period.
The surface solar radiation downwards from reanalysis data in the same region
confirms the brightening/dimming phenomenon shown by the sunshine duration data.
Otherwise, additional climatic variables, such as low cloud amount, total cloud amount,
precipitation, relative humidity and water vapor pressure, in most cases exhibit
significant negative correlations with sunshine duration in the TP on an annual
and seasonal basis. The trends of these variables suggest that changes in some of
them might be related to the brightening and dimming detected with the use of
sunshine duration measurements over the TP. We also hypothesize that the impact of
anthropogenic aerosols upon the climatic variables analyzed cannot be rejected,
especially in the significant increase in low cloud cover since approximately 1980. |
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