Modelling of strong heterogeneities in aerosol single scattering albedos over a polluted region

Details Modelling of strong heterogeneities in aerosol single scattering albedos over a polluted region Modelling of strong heterogeneities in aerosol single scattering albedos over a polluted region

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3209807m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 9, CiteID L09807

Physics

4

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Global Change: Regional Climate Change

Scientific paper

To date, most models dedicated to the investigation of aerosol direct or semi-direct radiative forcings have assumed the various aerosol components to be either completely externally mixed or homogeneously internally mixed. Some recent works have shown that a core-shell treatment of particles should be more realistic, leading to significant differences in the radiative impact as compared to only externally or well-internally mixed states. To account for these studies, an optical module, ORISAM-RAD, has been developed for computing aerosol radiative properties under the hypothesis of internally mixed particles with a n-layer spherical concentric structure. Mesoscale simulations using ORISAM-RAD, coupled with the 3D mesoscale model Meso-NH-C, have been performed for one selected day (06/24/2001) during the ESCOMPTE experiment in the Marseilles-Fos/Berre region, which illustrate the ability of this new module to reproduce spatial heterogeneities of measured single scattering albedo (ωo), due to industrial and/or urban pollution plumes.

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