Examination of direct cumulus contamination on MISR-retrieved aerosol optical depth and angstrom coefficient over ocean

Details Examination of direct cumulus contamination on MISR-retrieved aerosol optical depth and angstrom coefficient over ocean Examination of direct cumulus contamination on MISR-retrieved aerosol optical depth and angstrom coefficient over ocean

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3613811z&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 13, CiteID L13811

Physics

5

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Cloud/Radiation Interaction, Global Change: Impacts Of Global Change (1225), Global Change: Remote Sensing (1855), Atmospheric Composition And Structure: General Or Miscellaneous

Scientific paper

The effect of direct cumulus contamination on the aerosol optical depth (AOD) and angstrom exponent (AE) from the Multi-angle Imaging SpectroRadiometer (MISR) was examined using overlapped 15-m resolution data from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) over the tropical western Atlantic Ocean (RICO), the Gulf of Mexico (GOMX), and Indian Ocean (INDI). Overall, 12%, 6% and 11% of MISR 1.1-km pixels for aerosol retrievals contain some clouds, but 97%, 100% and 89% of these MISR pixels have the clouds covering less than 5% of the MISR pixel area over RICO, GOMX and INDI, respectively. On average, cumulus-contaminated pixels increase AOD at 558 nm by 0.02, 0.02 and 0.00 and decrease AE by 0.03, 0.11 and 0.04 for RICO, GOMX and INDI, respectively. Based on these findings, a MISR-derived aerosol optical depth climatology over the tropical oceans is biased high by no more than 0.002 from direct cumulus contamination.

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