Constraining the first aerosol indirect radiative forcing in the LMDZ GCM using POLDER and MODIS satellite data

Details Constraining the first aerosol indirect radiative forcing in the LMDZ GCM using POLDER and MODIS satellite data Constraining the first aerosol indirect radiative forcing in the LMDZ GCM using POLDER and MODIS satellite data

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217814q&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 17, CiteID L17814

Physics

24

Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Clouds And Aerosols, Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Remote Sensing

Scientific paper

The indirect effects of anthropogenic aerosols are expected to cause a significant radiative forcing of the Earth's climate whose magnitude, however, is still uncertain. Most climate models use parameterizations for the aerosol indirect effects based on so-called ``empirical relationships'' which link the cloud droplet number concentration to the aerosol concentration. New satellite datasets such as those from the POLDER and MODIS instruments are well suited to evaluate and improve such parameterizations at a global scale. We derive statistical relationships of cloud-top droplet radius and aerosol index (or aerosol optical depth) from satellite retrievals and fit an empirical parameterization in a general circulation model to match the relationships. When applying the fitted parameterizations in the model, the simulated radiative forcing by the first aerosol indirect effect is reduced by 50% as compared to our baseline simulation (down to -0.3 and -0.4 Wm-2 when using MODIS and POLDER satellite data, respectively).

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