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Examining the aerosol indirect effect over China using an SO2 emission inventory |
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| Authors: | Kazuaki Kawamoto Tadahiro Hayasaka Teruyuki Nakajima David Streets Jung-Hun Woo |
| Institution: | a Research Institute for Humanity and Nature (RIHN), 335 Takashima-cho, Kamigyo, Kyoto 602-0878, Japan;b Center for Climate System Research, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan;c Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA;d Center for Global and Regional Environmental Research, University of Iowa, Iowa City, IA 52242, USA |
| Abstract: | The relationship between SO2 emissions and the effective particle radius of low-level water clouds (re) over China was investigated to determine anthropogenic effects on clouds. Sulfur dioxide emission values were obtained from a statistical inventory, and re origins were retrieved by satellite remote sensing on a 0.5° grid. Comparisons between annual mean SO2 emissions and re showed generally decreasing re values, explained by the Twomey effect. The existence of the Twomey effect is supported by comparisons with simulated aerosol optical depths. Results further suggest that clouds over land show sensitivity to the Twomey effect as well as clouds over the ocean. |
| Keywords: | Satellite remote sensing Cloud Aerosol indirect effect SO2 emission Radiation |
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