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Derivation of component aerosol direct radiative forcing at the top of atmosphere for clear-sky oceans |
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| Authors: | Tom X.-P. Zhao Hongbin Yu Istvan Laszlo William C. Conant |
| Affiliation: | a Coorporate Institute of Climate Study, Earth System Science Interdisciplinary Center, UMCP, College Park, MD 20742, USA b Center of Satellite Applications and Research, NOAA/NESDIS, Camp Springs, MD 20746, USA c Laboratory for Atmospheres, NASA/GSFC, Greenbelt, MD 20771, USA d Goddard Earth Science and Technology Center, UMBC, Baltimore, MD 21250, USA e Department of Atmospheric Sciences, University of Arizona, Tucson, AZ 85721, USA |
| Abstract: | A two-step approach is proposed to derive component aerosol direct radiative forcing (ADRF) at the top of atmosphere (TOA) over global oceans from 60°S to 60°N for clear-sky condition by combining Terra CERES/MODIS-SSF shortwave (SW) flux and aerosol optical thickness (AOT) observations with the fractions of component AOTs from the GSFC/GOCART model. The derived global annual mean component ADRF is +0.08±0.17 W/m2 for black carbon, −0.52±0.24 W/m2 for organic carbon, −1.10±0.42 W/m2 for sulfate, −0.99±0.37 W/m2 for dust, −2.44±0.84 W/m2 for sea salt, and −4.98±1.67 W/m2 for total aerosols. The total ADRF has also been partitioned into anthropogenic and natural components with a value of −1.25±0.43 and −3.73±1.27 W/m2, respectively. The major sources of error in the estimates have also been discussed. The analysis adds an alternative technique to narrow the large difference between current model-based and observation-based global estimates of component ADRF by combining the satellite measurement with the model simulation. |
| Keywords: | Aerosol direct radiative forcing Aerosol optical thickness |
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