Dependence of ‘critical cloud fraction’ on aerosol composition | Zendy

Eswaran K. | Zendy; Satheesh S. K. | Zendy; Srinivasan J. | Zendy

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Dependence of ‘critical cloud fraction’ on aerosol composition

Author(s) -

Eswaran K.,

Satheesh S. K.,

Srinivasan J.

Publication year - 2015

Publication title -

atmospheric science letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.951

H-Index - 45

ISSN - 1530-261X

DOI - 10.1002/asl2.571

Subject(s) - aerosol , environmental science , atmospheric sciences , moderate resolution imaging spectroradiometer , radiative forcing , spectroradiometer , lidar , radiative transfer , forcing (mathematics) , satellite , meteorology , remote sensing , physics , optics , reflectivity , geology , astronomy

Recent studies, over regions influenced by biomass burning aerosol, have shown that it is possible to define a ‘critical cloud fraction’ ( CCF ) at which the aerosol direct radiative forcing switch from a cooling to a warming effect. Using 4 years of multi‐satellite data analysis, we show that CCF varies with aerosol composition and changed from 0.28 to 0.13 from postmonsoon to winter as a result of shift from less absorbing to moderately absorbing aerosol. Our results indicate that we can estimate aerosol absorption from space using independently measured top of the atmosphere ( TOA ) fluxes [Cloud Aerosol Lidar with Orthogonal Polarization‐Moderate resolution Imaging Spectroradiometer‐Clouds and the Earth's Radiant Energy System ( CALIPSO‐MODIS ‐ CERES )] combined algorithms for example.

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