Asia-Pacific Journal of Atmospheric Sciences

Korean Meteorological Society (한국기상학회)
권호 표지

Classification of Aerosol Type from MODIS and OMI over East Asia

Lee, Jae-Hwa;Kim, J.-Hoon;Lee, Hee-Choon;Takemura, Toshihiko

  • Published : 20071100
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Abstract

Aerosols afect the earths climate by scattering and absorbing radiation, and by altering the cloud microphysics. Since the effects of aerosols are different from the type to the other, aerosol type clasification from satellite remote sensing optical thicknes (AOT) and ngstrm exponent (AE) of Moderate Resolution Imaging Spectroradiometer (MODIS) and aerosol index (AI) of Ozone Monitoring Instrument (OMI) data. The optical properties and types of aerosol are ana-lyzed over the East Asia, one of the heavily poluted regions on the globe. AOTs significantly decrease from near-continent ocean to remote ocean in monthly climatology, and the maximum AOT is represented in June over the Northeast China, Korean Peninsula, and Japan. The distribution of AEs indicates that aerosols of anthropogenic as well as natural origin ation of AI is represented over the regions with latitude betwen 30N and 40N where the influence of Asian Dust is significant in dry season. Retrieved aerosol types by MODIS-OMI algorithm showed that the aerosols are considerably mixed, and represented seasonal variation over East Asia. The evidence of pollution transport is detected by aerosol clasification, that is, the anthropogenic aerosol types are detected over ocean not only over land. Based on retrieved aerosol types, the frequency distributions of each aerosol sea salt/sulfate at Beijing, whereas sea salt/sulfate mixture is most frequently detected at Seoul and Tokyo. The frequency distributions of aerosol types are similar for both in 2005 and 2006, while the distribution showed considerable seasonal variations.

Keywords

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