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Aerosol properties over the Indian Ocean Experiment (INDOEX) campaign area retrieved from ATSR-2

Author: Robles-Gonzalez, C. · Leeuw, · Decae, R. · Kusmierczyk-Michulec, J.T. · Stammes, P.
Institution: TNO Defensie en Veiligheid
Source:Journal of Geophysical Research D: Atmospheres, 15, 111
Identifier: 239423
doi: doi:10.1029/2005JD006184
Article number: D15205
Keywords: Physics · Algorithms · Atmospheric aerosols · Atmospheric composition · Atmospheric optics · Biomass · Radiometers · aerosol composition · aerosol property · algorithm · Along Track Scanning Radiometer · biomass burning · intertropical convergence zone · optical depth · Indian Ocean


Aerosol retrieved algorithms for ATSR-2 have been applied over land and water using data from the Indian Ocean Experiment (INDOEX) Intensive Field Phase (IFP) in February and March 1999. The goal was the extension of the ATSR-2 algorithms, developed for application over the U.S. east coast and Europe, to other areas with different types of aerosols and to explore the feasibility of deriving spatial variations in the aerosol composition. The ATSR-2 algorithm was extended with absorbing aerosols, and AERONET data were used to test the retrieved spectral aerosol optical depth (AOD). The resulting maps of AOD at 0.659 μm, Ångström coefficient and urban/industrial aerosol contribution to the AOD over the ocean are evaluated by comparison with in situ data. AOD over land is in the range 0.18-0.45 with values up to 0.7 when biomass burning aerosol is present and decreases gradually over water with increasing fetch to 0.15 near the Intertropical Convergence Zone (ITCZ). Ångström coefficients over land are in the range 1.5-2.0. Over water these values gradually decrease to almost zero. Over land urban/industrial aerosol dominates, and, as expected, over water the anthropogenic influence gradually decreases with fetch and the relative contribution of marine aerosol increases. South of the ITCZ the anthropogenic effect is negligible. Copyright 2006 by the American Geophysical Union.