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How can aerosols affect the Asian summer monsoon?: assessment during three consecutive pre-monsoon seasons from CALIPSOsatellite data

The impact of aerosols above and around the Tibetan Plateau on the Asian Summer Monsoon during premonsoon 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.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:13831
Date January 2010
CreatorsKuhlmann, Julian, Quaas, Johannes
ContributorsMax-Planck-Institut für Meteorologie, TU Dortmund
PublisherCopernicus Publications
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typedoc-type:article, info:eu-repo/semantics/article, doc-type:Text
SourceAtmospheric chemistry and physics (2010) 10, S.4673-4688
Rightsinfo:eu-repo/semantics/openAccess

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