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| Titel |
Coherent uncertainty analysis of aerosol measurements from multiple satellite sensors |
| VerfasserIn |
M. Petrenko, C. Ichoku |
| 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. 14 ; Nr. 13, no. 14 (2013-07-22), S.6777-6805 |
| Datensatznummer |
250018766
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| Publikation (Nr.) |
 copernicus.org/acp-13-6777-2013.pdf |
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| Zusammenfassung |
| Aerosol retrievals from multiple spaceborne sensors, including MODIS (on
Terra and Aqua), MISR, OMI, POLDER, CALIOP, and SeaWiFS – altogether, a
total of 11 different aerosol products – were comparatively analyzed using
data collocated with ground-based aerosol observations from the Aerosol
Robotic Network (AERONET) stations within the Multi-sensor Aerosol Products
Sampling System (MAPSS, http://giovanni.gsfc.nasa.gov/mapss/
and http://giovanni.gsfc.nasa.gov/aerostat/. The analysis was
performed by comparing quality-screened satellite aerosol optical depth or
thickness (AOD or AOT) retrievals during 2006–2010 to available collocated
AERONET measurements globally, regionally, and seasonally, and deriving a
number of statistical measures of accuracy. We used a robust statistical
approach to detect and remove possible outliers in the collocated data that
can bias the results of the analysis. Overall, the proportion of outliers in
each of the quality-screened AOD products was within 7%. Squared
correlation coefficient (R2) values of the satellite AOD retrievals
relative to AERONET exceeded 0.8 for many of the analyzed products, while
root mean square error (RMSE) values for most of the AOD products were
within 0.15 over land and 0.07 over ocean. We have been able to generate
global maps showing regions where the different products present advantages
over the others, as well as the relative performance of each product over
different land cover types. It was observed that while MODIS, MISR, and
SeaWiFS provide accurate retrievals over most of the land cover types,
multi-angle capabilities make MISR the only sensor to retrieve reliable AOD
over barren and snow/ice surfaces. Likewise, active sensing enables CALIOP
to retrieve aerosol properties over bright-surface closed shrublands more
accurately than the other sensors, while POLDER, which is the only one of
the sensors capable of measuring polarized aerosols, outperforms other
sensors in certain smoke-dominated regions, including broadleaf evergreens
in Brazil and South-East Asia. |
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