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| Titel |
The fate of saharan dust across the atlantic and implications for a central american dust barrier |
| VerfasserIn |
E. Nowottnick, P. Colarco, A. Silva, D. Hlavka, M. McGill |
| 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 ; 11, no. 16 ; Nr. 11, no. 16 (2011-08-18), S.8415-8431 |
| Datensatznummer |
250010012
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| Publikation (Nr.) |
 copernicus.org/acp-11-8415-2011.pdf |
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| Zusammenfassung |
| Saharan dust was observed over the Caribbean basin during the summer 2007
NASA Tropical Composition, Cloud, and Climate Coupling (TC4) field
experiment. Airborne Cloud Physics Lidar (CPL) and satellite observations
from MODIS suggest a barrier to dust transport across Central America into
the eastern Pacific. We use the NASA GEOS-5 atmospheric transport model with
online aerosol tracers to perform simulations of the TC4 time period in
order to understand the nature of this barrier. Our simulations are driven
by the Modern Era Retrospective-Analysis for Research and Applications
(MERRA) meteorological analyses. Compared to observations from MODIS and
CALIOP, GEOS-5 reproduces the observed location and magnitude of observed
dust events, but our baseline simulation does not develop as strong a
barrier to dust transport across Central America as observations suggest.
Analysis of the dust transport dynamics and loss processes suggest that
while both mechanisms play a role in defining the dust transport barrier,
loss processes by wet removal of dust are about twice as important as
transport. Sensitivity analyses with our model showed that the dust barrier
would not exist without convective scavenging over the Caribbean. The best
agreement between our model and the observations was obtained when dust wet
removal was parameterized to be more aggressive, treating the dust as we do
hydrophilic aerosols. |
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