Satellite based analysis of aerosol effect on cloud droplet size in eastern China

As concluded by IPCC Fourth Assessment Report, the aerosol first indirect effect, so-called Twomey effect could be climatically important. Seven consecutive summers (2002-2008) of daily observations from MODIS instrument are used to reveal aerosol-cloud relationship over a region of continent, the eastern China(30°N-41°N; 114°E-123°E). The results indicates that AOD effect DER more significantly when the droplet is smaller. Small droplet observations reveal an `Anti-Twomey' effect while large droplet observations show the contrary Twomey effect. The regions study on scale 1° × 1° also contains results lead to both the Twomey effect and `Anti-twomey' effect. This phenomenon might be caused by the distribution of aerosol chemical composition and particles size.

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