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GEOPHYSICAL RESEARCH LETTERS
Volume 33, Issue 15, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GL025535
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Most assessments of the direct climate forcing (DCF) of anthropogenic aerosols are from numerical simulations. However, recent advances in remote sensing techniques allow the separation of fine mode aerosols ( anthropogenic aerosol is mostly fine aerosol) from coarse mode aerosols ( largely marine and dust, which are mostly natural) from satellite data such as the Moderate Resolution Imaging SpectroRadiometer ( MODIS). Here, by combining MODIS narrowband measurements with broadband radiative flux data sets from the Clouds and the Earth's Radiant Energy System (CERES), we provide a measurement-based assessment of the global direct climate forcing ( DCF) of anthropogenic aerosols at the top of atmosphere (TOA) only for cloud free oceans. The mean TOA DCF of anthropogenic aerosols over cloud-free oceans [60N - 60S] is - 1.4 +/- 0.9 Wm(-2), which is in excellent agreement ( mean value of - 1.4 Wm(-2)) with a recent observational study by Kaufman et al. [ 2005].
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