Estimation of Asian dust aerosol effect on cloud radiation forcing using Fu-Liou radiative model and CERES measurementsReport as inadecuate




Estimation of Asian dust aerosol effect on cloud radiation forcing using Fu-Liou radiative model and CERES measurements - Download this document for free, or read online. Document in PDF available to download.

1 College of Atmospheric Science 2 Department of Atmospheric Sciences Seattle 3 LaRC - NASA Langley Research Center Hampton

Abstract : The impact of Asian dust on cloud radiative forcing during 2003?2006 is studied by using the Clouds and Earth-s Radiant Energy Budget Scanner CERES data and the Fu-Liou radiative transfer model. Analysis of satellite data shows that the dust aerosol significantly reduced the cloud cooling effect at TOA. In dust contaminated cloudy regions, the 4-year mean values of the instantaneous shortwave, longwave and net cloud radiative forcing are ?138.9, 69.1, and ?69.7 Wm?2, which are 57.0, 74.2, and 46.3%, respectively, of the corresponding values in pristine cloudy regions. The satellite-retrieved cloud properties are significantly different in the dusty regions and can influence the radiative forcing indirectly. The contributions to the cloud radiation forcing by the dust direct, indirect and semi-direct effects are estimated using combined satellite observations and Fu-Liou model simulation. The 4-year mean value of combination of indirect and semi-direct shortwave radiative forcing SWRF is 82.2 Wm?2, which is 78.4% of the total dust effect. The direct effect is only 22.7 Wm?2, which is 21.6% of the total effect. Because both first and second indirect effects enhance cloud cooling, the aerosol-induced cloud warming is mainly the result of the semi-direct effect of dust.





Author: J. Su - J. Huang - Q. Fu - P. Minnis - J. Ge - J. Bi -

Source: https://hal.archives-ouvertes.fr/



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