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Yu, Hongbin; Chin, Mian; Remer, Lorraine A.; Kleidman, Richard G.; Bellouin, Nicolas; Bian, Huisheng; Diehl, Thomas (2009)
Publisher: American Geophysical Union
Languages: English
Types: Article
In this study, we examine seasonal and geographical variability of marine aerosol\ud fine-mode fraction ( fm) and its impacts on deriving the anthropogenic component of\ud aerosol optical depth (ta) and direct radiative forcing from multispectral satellite\ud measurements. A proxy of fm, empirically derived from the Moderate Resolution Imaging\ud Spectroradiometer (MODIS) Collection 5 data, shows large seasonal and geographical\ud variations that are consistent with the Goddard Chemistry Aerosol Radiation Transport\ud (GOCART) and Global Modeling Initiative (GMI) model simulations. The so-derived\ud seasonally and spatially varying fm is then implemented into a method of estimating ta and\ud direct radiative forcing from the MODIS measurements. It is found that the use of a\ud constant value for fm as in previous studies would have overestimated ta by about 20%\ud over global ocean, with the overestimation up to �45% in some regions and seasons. The\ud 7-year (2001–2007) global ocean average ta is 0.035, with yearly average ranging from\ud 0.031 to 0.039. Future improvement in measurements is needed to better separate\ud anthropogenic aerosol from natural ones and to narrow down the wide range of aerosol\ud direct radiative forcing.
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