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Investigating enhanced Aqua MODIS aerosol optical depth retrievals over the mid‐to‐high latitude Southern Oceans through intercomparison with co‐located CALIOP, MAN, and AERONET data sets
Author(s) -
Toth Travis D.,
Zhang Jianglong,
Campbell James R.,
Reid Jeffrey S.,
Shi Yingxi,
Johnson Randall S.,
Smirnov Alexander,
Vaughan Mark A.,
Winker David M.
Publication year - 2013
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/jgrd.50311
Subject(s) - aeronet , aerosol , environmental science , moderate resolution imaging spectroradiometer , lidar , optical depth , cloud top , atmospheric sciences , remote sensing , satellite , climatology , meteorology , geology , geography , engineering , aerospace engineering
A band of enhanced aerosol optical depth (AOD) over the mid‐to‐high latitude Southern Oceans exists in some passive satellite‐based aerosol data sets, including Moderate Resolution Imaging Spectroradiometer (MODIS) products. Past studies suggest several potential causes contributing to this phenomenon, including signal uncertainty, retrieval bias, and cloud contamination. In this paper, quality‐assured Aqua MODIS aerosol products in this zonal band are investigated to assess cloud contamination as a cause. Spatially and temporally collocated cloud and aerosol products produced by the Cloud‐Aerosol Lidar with Orthogonal Polarization (CALIOP) project relative to Aqua MODIS AOD in this region are considered. Maritime Aerosol Network (MAN) and Aerosol Robotic Network (AERONET) AOD data are also collocated with Aqua MODIS retrievals for surface context. The results of this study indicate that the high Aqua MODIS AOD are not seen in the CALIOP aerosol products, cannot be screened using active profiling of collocated observations for cloud presence, and are not detected by ground‐based observations such as MAN and AERONET. Enhanced AOD values are attributable primarily to stratocumulus and low broken cumulus cloud contamination, as identified with CALIOP products. But these clouds explain only about 30–40% of the total anomaly. Cirrus cloud contamination is also a factor. However, in contrast to the rest of the globe, they contribute less overall, relative to low‐level liquid water clouds, which are considered likely the result of misidentification of relatively warm cloud tops compared with surrounding open seas.