Skip all navigation and jump to content Jump to site navigation
About MODIS News Data Tools /images2 Science Team Science Team Science Team

   + Home
MODIS Publications Link
MODIS Presentations Link
MODIS Biographies Link
MODIS Science Team Meetings Link



Zhang, JL, Reid, JS, Holben, BN (2005). An analysis of potential cloud artifacts in MODIS over ocean aerosol optical thickness products. GEOPHYSICAL RESEARCH LETTERS, 32(15), L15803.

Using spatially and temporally collocated MODerate Resolution Imaging Spectroradiometer ( MODIS) products and data from seven AErosol RObotic NETwork (AERONET) sun-photometer sites, we explored the relationship between MODIS aerosol optical depth and cloud fraction over remote oceans that have been recently reported in the literature. We show that artifacts such as cloud contamination or adjacency effect contribute to the majority of the relationship in clean marine conditions. This cloud fraction effect could result in a 10 - 20% overestimation in monthly mean aerosol optical depth or aerosol direct forcing values that are derived using MODIS aerosol products over cloud free oceans. It may also explain some of the high optical depth values derived in the mid-latitude southern oceans. We also suggest that covariances of meteorological phenomenon such as wind or humidity in cloudy regions while logical might only account for a minor portion of the ensemble relationship.



NASA Home Page Goddard Space Flight Center Home Page