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| Titel |
The comparison of MODIS-Aqua (C5) and CALIOP (V2 & V3) aerosol optical depth |
| VerfasserIn |
J. Redemann, M. A. Vaughan, Q. Zhang, Y. Shinozuka, P. B. Russell, J. M. Livingston, M. Kacenelenbogen, L. A. Remer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 6 ; Nr. 12, no. 6 (2012-03-28), S.3025-3043 |
| Datensatznummer |
250010949
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| Publikation (Nr.) |
 copernicus.org/acp-12-3025-2012.pdf |
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| Zusammenfassung |
| We assess the consistency between instantaneously
collocated level-2 aerosol optical depth (AOD) retrievals from MODIS-Aqua
(C5) and CALIOP (Version 2 & 3), comparing the standard MODIS AOD
(MYD04_L2) data to the AOD calculated from CALIOP aerosol extinction
profiles for both the previous release (V2) and the latest release (V3) of
CALIOP data. Based on data collected in January 2007, we investigate the
most useful criteria for screening the MODIS and CALIOP retrievals to
achieve the best agreement between the two data sets. Applying these
criteria to eight months of data (Jan, Apr, Jul, Oct 2007 and 2009), we
find an order of magnitude increase for the CALIOP V3 data density (by
comparison to V2), that is generally accompanied by equal or better
agreement with MODIS AOD. Differences in global, monthly mean, over-ocean
AOD (532 nm) between CALIOP and MODIS range between 0.03 and 0.04 for CALIOP
V3, with CALIOP generally biased low, when all available data from both
sensors are considered. Root-mean-squares (RMS) differences in
instantaneously collocated AOD retrievals by the two instruments are reduced
from values ranging between 0.14 and 0.19 using the unscreened V3 data to
values ranging from 0.09 to 0.1 for the screened data. A restriction to
scenes with cloud fractions less than 1% (as defined in the MODIS aerosol
retrievals) generally results in improved correlation (R2>0.5),
except for the month of July when correlations remain relatively lower.
Regional assessments show hot spots in disagreement between the two sensors
in Asian outflow during April and off the coast of South Africa in July. |
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