Retrieval of aerosol optical depth under thin cirrus from MODIS: Application to an ocean algorithm
被引:24
作者:
Lee, Jaehwa
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Univ Maryland, Earth Syst Sci Inter disciplinary Ctr, College Pk, MD 20742 USA
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USAUniv Maryland, Earth Syst Sci Inter disciplinary Ctr, College Pk, MD 20742 USA
Lee, Jaehwa
[1
,2
]
Hsu, N. Christina
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NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USAUniv Maryland, Earth Syst Sci Inter disciplinary Ctr, College Pk, MD 20742 USA
Hsu, N. Christina
[2
]
Bettenhausen, Corey
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机构:
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Sci Syst & Applicat Inc, Lanham, MD USAUniv Maryland, Earth Syst Sci Inter disciplinary Ctr, College Pk, MD 20742 USA
Bettenhausen, Corey
[2
,3
]
Sayer, Andrew M.
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NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Univ Space Res Assoc, Goddard Earth Sci Technol & Res, Columbia, MD USAUniv Maryland, Earth Syst Sci Inter disciplinary Ctr, College Pk, MD 20742 USA
Sayer, Andrew M.
[2
,4
]
机构:
[1] Univ Maryland, Earth Syst Sci Inter disciplinary Ctr, College Pk, MD 20742 USA
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] Sci Syst & Applicat Inc, Lanham, MD USA
[4] Univ Space Res Assoc, Goddard Earth Sci Technol & Res, Columbia, MD USA
A strategy for retrieving aerosol optical depth (AOD) under conditions of thin cirrus coverage from the Moderate Resolution Imaging Spectroradiometer (MODIS) is presented. We adopt an empirical method that derives the cirrus contribution to measured reflectance in seven bands from the visible to shortwave infrared (0.47, 0.55, 0.65, 0.86, 1.24, 1.63, and 2.12 mu m, commonly used for AOD retrievals) by using the correlations between the top-of-atmosphere (TOA) reflectance at 1.38 mu m and these bands. The 1.38 mu m band is used due to its strong absorption by water vapor and allows us to extract the contribution of cirrus clouds to TOA reflectance and create cirrus-corrected TOA reflectances in the seven bands of interest. These cirrus-corrected TOA reflectances are then used in the aerosol retrieval algorithm to determine cirrus-corrected AOD. The cirrus correction algorithm reduces the cirrus contamination in the AOD data as shown by a decrease in both magnitude and spatial variability of AOD over areas contaminated by thin cirrus. Comparisons of retrieved AOD against Aerosol Robotic Network observations at Nauru in the equatorial Pacific reveal that the cirrus correction procedure improves the data quality: the percentage of data within the expected error +/-(0.03+0.05xAOD) increases from 40% to 80% for cirrus-corrected points only and from 80% to 86% for all points (i.e., both corrected and uncorrected retrievals). Statistical comparisons with Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) retrievals are also carried out. A high correlation (R=0.89) between the CALIOP cirrus optical depth and AOD correction magnitude suggests potential applicability of the cirrus correction procedure to other MODIS-like sensors.
机构:
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Roskovensky, J. K.
;
Liou, K. N.
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Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
机构:
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Roskovensky, JK
;
Liou, KN
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机构:
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
机构:
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Roskovensky, J. K.
;
Liou, K. N.
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机构:
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
机构:
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA
Roskovensky, JK
;
Liou, KN
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Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA