부산대학교 도서관

For the first time, using the Terra Moderate Resolution Imaging Spectroradiometer (MODIS)-based cloud screening methods, we have evaluated the impacts of cloud contamination on the Terra Multi-angle Imaging Spectroradiometer (MISR) aerosol optical depth (AOD) product. Our study, based on one year of collocated MISR and MODIS data, suggests that cloud contamination exists in both over-water and over-land MISR AOD data with heavier cloud contamination occurring over the high latitude Southern hemispheric oceans. On average globally, our study shows that thin cirrus cloud contamination introduces a possible ~0.01 high bias for the over-water MISR AOD retrievals. Over the mid to high latitude oceans and Southeast Asia, this number increases to 0.015-0.02. However, biases much larger than this mean value are found in individual retrievals. This study suggests that cloud-clearing methods using observations from MISR alone, which has only visible and near infrared channels, may not be sufficient. Measurements from MODIS can be applied to assist cloud-clearing of the MISR aerosol retrievals. Cloud screening algorithms based on multi-sensor approaches are feasible and should be considered for current and future satellite aerosol studies. [ABSTRACT FROM AUTHOR]