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| Titel |
The global 3-D distribution of tropospheric aerosols as characterized by CALIOP |
| VerfasserIn |
D. M. Winker, J. L. Tackett, B. J. Getzewich, Z. Liu, M. A. Vaughan, R. R. Rogers |
| 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 ; 13, no. 6 ; Nr. 13, no. 6 (2013-03-25), S.3345-3361 |
| Datensatznummer |
250018536
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| Publikation (Nr.) |
 copernicus.org/acp-13-3345-2013.pdf |
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| Zusammenfassung |
| The CALIOP lidar, carried on the CALIPSO satellite, has been acquiring global
atmospheric profiles since June 2006. This dataset now offers the opportunity
to characterize the global 3-D distribution of aerosol as well as seasonal
and interannual variations, and confront aerosol models with observations in
a way that has not been possible before. With that goal in mind, a monthly
global gridded dataset of daytime and nighttime aerosol extinction profiles
has been constructed, available as a Level 3 aerosol product. Averaged aerosol profiles for cloud-free and all-sky
conditions are reported separately. This 6-yr dataset characterizes the
global 3-dimensional distribution of tropospheric aerosol. Vertical
distributions are seen to vary with season, as both source strengths and
transport mechanisms vary. In most regions, clear-sky and all-sky mean
aerosol profiles are found to be quite similar, implying a lack of
correlation between high semi-transparent cloud and aerosol in the lower
troposphere. An initial evaluation of the accuracy of the aerosol extinction
profiles is presented. Detection limitations and the representivity of
aerosol profiles in the upper troposphere are of particular concern. While
results are preliminary, we present evidence that the monthly-mean CALIOP
aerosol profiles provide quantitative characterization of elevated aerosol
layers in major transport pathways. Aerosol extinction in the free troposphere
in clean conditions, where the true aerosol extinction is typically
0.001 km−1 or less, is generally underestimated, however. The work
described here forms an initial global 3-D aerosol climatology which we plan
to extend and improve over time. |
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