Derivation of component aerosol direct radiative forcing at the top of atmosphere for clear-sky oceans

Tom X.P. Zhao, Hongbin Yu, Istvan Laszlo, Mian Chin, William C. Conant

Research output: Contribution to journalArticle

21 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)1162-1186
Number of pages25
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume109
Issue number7
DOIs
StatePublished - May 1 2008

Keywords

  • Aerosol direct radiative forcing
  • Aerosol optical thickness

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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