TY - JOUR
T1 - Derivation of component aerosol direct radiative forcing at the top of atmosphere for clear-sky oceans
AU - Zhao, Tom X.P.
AU - Yu, Hongbin
AU - Laszlo, Istvan
AU - Chin, Mian
AU - Conant, William C.
N1 - Funding Information:
We would like to acknowledge the NASA CERES project and the DAAC of the NASA Langley for providing the CERES/SSF data. We also thank Dr. Mi Zhou at the NOAA/NESDIS/STAR for providing her calculation for the COVE site of AERONET to compare with our result in the CLAMS case. Two reviewers’ comments are very helpful for the improvement of the manuscript. This research is funded by the NASA Radiation Program managed by Dr. Hal Maring through grant RSP-0022-0005 and the Cooperative Institute Program of NOAA/NESDIS/STAR.
PY - 2008/5
Y1 - 2008/5
N2 - 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.
AB - 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.
KW - Aerosol direct radiative forcing
KW - Aerosol optical thickness
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U2 - 10.1016/j.jqsrt.2007.10.006
DO - 10.1016/j.jqsrt.2007.10.006
M3 - Article
AN - SCOPUS:40649124767
SN - 0022-4073
VL - 109
SP - 1162
EP - 1186
JO - Journal of Quantitative Spectroscopy and Radiative Transfer
JF - Journal of Quantitative Spectroscopy and Radiative Transfer
IS - 7
ER -