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| Titel |
Intercomparison of column aerosol optical depths from CALIPSO and MODIS-Aqua |
| VerfasserIn |
C. Kittaka, D. M. Winker, M. A. Vaughan, A. Omar, L. A. Remer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 2 ; Nr. 4, no. 2 (2011-02-01), S.131-141 |
| Datensatznummer |
250001666
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| Publikation (Nr.) |
 copernicus.org/amt-4-131-2011.pdf |
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| Zusammenfassung |
| The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) is carried on
the CALIPSO satellite and has acquired global aerosol profiles since June
2006. CALIPSO is flown in formation with the Aqua satellite as part of the
A-train satellite constellation, so that a large number of coincident
aerosol observations are available from CALIOP and the MODIS-Aqua
instrument. This study compares column aerosol optical depth at 0.532 μm
derived from CALIOP aerosol profiles with MODIS-Aqua 0.55 μm aerosol
optical depth over the period June 2006 through August 2008. The study is
based on the CALIOP Version 2 Aerosol Layer Product and MODIS Collection 5.
While CALIOP is first and foremost a profiling instrument, this comparison
of column aerosol optical depth provides insight into quality of CALIOP
aerosol data. It is found that daytime aerosol optical depth from the CALIOP
Version 2 product has only a small global mean bias relative to MODIS
Collection 5. Regional biases, of both signs, are larger and biases are seen
to vary somewhat with season. Good agreement between the two sensors in ocean regions with low
cloudiness suggests that the selection of lidar ratios used in the
CALIOP aerosol retrieval is sufficient to provide a regional mean AOD
consistent with that retrieved from MODIS. Although differences over land are observed to
be larger than over ocean, the bias between CALIOP and MODIS AOD on a
regional-seasonal basis is found to be roughly within the envelope of the
MODIS expected uncertainty over land and ocean. This work forms a basis for
further comparisons using the recently released CALIOP Version 3 data. |
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