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| Titel |
Evaluation of aerosol distributions in the GISS-TOMAS global aerosol microphysics model with remote sensing observations |
| VerfasserIn |
Y. H. Lee, P. J. Adams |
| 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 ; 10, no. 5 ; Nr. 10, no. 5 (2010-03-01), S.2129-2144 |
| Datensatznummer |
250008160
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| Publikation (Nr.) |
 copernicus.org/acp-10-2129-2010.pdf |
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| Zusammenfassung |
| The Aerosol Optical Depth (AOD) and Angstrom Coefficient (AC) predictions in
the GISS-TOMAS model of global aerosol microphysics are evaluated against
remote sensing data from MODIS, MISR, and AERONET. The model AOD agrees well
(within a factor of two) over polluted continental (or high sulfate), dusty,
and moderate sea-salt regions but less well over the equatorial, high
sea-salt, and biomass burning regions. Underprediction of sea-salt in the
equatorial region is likely due to GCM meteorology (low wind speeds and high
precipitation). For the Southern Ocean, overprediction of AOD is very likely
due to high sea-salt emissions and perhaps aerosol water uptake in the
model. However, uncertainties in cloud screening at high latitudes make it
difficult to evaluate the model AOD there with the satellite-based AOD. AOD
in biomass burning regions is underpredicted, a tendency found in other
global models but more severely here. Using measurements from the LBA-SMOCC
2002 campaign, the surface-level OC concentration in the model are found to
be underpredicted severely during the dry season while much less severely
for EC concentration, suggesting the low AOD in the model is due to
underpredictions in OM mass. The potential for errors in emissions and wet
deposition to contribute to this bias is discussed. |
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