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| Titel |
How can aerosols affect the Asian summer monsoon? Assessment during three consecutive pre-monsoon seasons from CALIPSO satellite data |
| VerfasserIn |
J. Kuhlmann, J. Quaas |
| 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 ; 10, no. 10 ; Nr. 10, no. 10 (2010-05-21), S.4673-4688 |
| Datensatznummer |
250008469
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| Publikation (Nr.) |
 copernicus.org/acp-10-4673-2010.pdf |
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| Zusammenfassung |
| The impact of aerosols above and around the Tibetan Plateau on the Asian
Summer Monsoon during pre-monsoon seasons March-April-May 2007, 2008, and
2009 is investigated by means of remote sensing and radiative transfer
modelling. Four source regions are found to be responsible for the high
aerosol loading around the Tibetan Plateau: the Taklamakan Desert, the Ganges
Plains, the Indus Plains, and the Arabian Sea. CALIPSO lidar satellite data,
providing vertically resolved images of aerosols, shows aerosol
concentrations to be highest in the lower 5 km of the atmosphere with only
little amounts reaching the Tibetan Plateau altitude. Using a radiative
transfer model we find that aerosol plumes reduce shortwave radiation
throughout the Monsoon region in the seasonal average by between 20 and
30 W/m2. Peak shortwave heating in the lower troposphere reaches
0.2 K/day. In higher layers this shortwave heating is partly balanced by
longwave cooling. Although high-albedo surfaces, such as deserts or the
Tibetan Plateau, increase the shortwave heating by around 10%, the overall
effect is strongest close to the aerosol sources. A strong elevated heating
which could influence large-scale monsoonal circulations as suggested by
previous studies is not found. |
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