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| Titel |
MODIS 3 km aerosol product: algorithm and global perspective |
| VerfasserIn |
L. A. Remer, S. Mattoo, R. C. Levy, L. A. Munchak |
| 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 ; 6, no. 7 ; Nr. 6, no. 7 (2013-07-31), S.1829-1844 |
| Datensatznummer |
250017930
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| Publikation (Nr.) |
 copernicus.org/amt-6-1829-2013.pdf |
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| Zusammenfassung |
| After more than a decade of producing a nominal 10 km aerosol product based
on the dark target method, the MODerate resolution Imaging Spectroradiometer (MODIS) aerosol team will be releasing a nominal
3 km product as part of their Collection 6 release. The new product differs
from the original 10 km product only in the manner in which reflectance
pixels are ingested, organized and selected by the aerosol algorithm.
Overall, the 3 km product closely mirrors the 10 km product. However, the
finer resolution product is able to retrieve over the ocean closer to islands and
coastlines, and is better able to resolve fine aerosol features such as smoke
plumes over both ocean and land. In some situations, it provides retrievals
over entire regions that the 10 km product barely samples. In situations
traditionally difficult for the dark target algorithm such as over bright or
urban surfaces, the 3 km product introduces isolated spikes of artificially
high aerosol optical depth (AOD) that the 10 km algorithm avoids. Over land,
globally, the 3 km product appears to be 0.01 to 0.02 higher than the 10 km
product, while over ocean, the 3 km algorithm is retrieving a proportionally
greater number of very low aerosol loading situations. Based on collocations
with ground-based observations for only six months, expected errors
associated with the 3 km land product are determined to be greater than that
of
the 10 km product: ± 0.05 ± 0.20 AOD. Over ocean, the suggestion is
for expected errors to be the same as the 10 km product: ± 0.03 ±
0.05 AOD, but slightly less accurate in the coastal zone. The advantage of
the product is on the local scale, which will require continued evaluation
not addressed here. Nevertheless, the new 3 km product is expected to
provide important information complementary to existing satellite-derived
products and become an important tool for the aerosol community. |
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