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| Titel |
Trans-pacific dust transport: integrated analysis of NASA/CALIPSO and a global aerosol transport model |
| VerfasserIn |
K. Eguchi, I. Uno, K. Yumimoto, T. Takemura, A. Shimizu, N. Sugimoto, Z. Liu |
| 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 ; 9, no. 9 ; Nr. 9, no. 9 (2009-05-14), S.3137-3145 |
| Datensatznummer |
250007277
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| Publikation (Nr.) |
 copernicus.org/acp-9-3137-2009.pdf |
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| Zusammenfassung |
| Detailed 3-D structures of Trans-Pacific Asian dust transport occurring
during 5–15 May 2007 were investigated using the NASA/CALIOP
vertical-resolved measurements and a three-dimensional aerosol model
(SPRINTARS). Both CALIOP and SPRINTARS dust extinctions showed a good
agreement along the way of the transport from the dust source regions across
North Pacific into North America. A vertically two-layered dust distribution
was observed over the northeastern Pacific and North America. The lower dust
layer originated from a dust storm generated in the Gobi Desert on 5 May. It
was transported at an altitude of around 4 km MSL and has mixed with Asian
anthropogenic air pollutants during the course of transport. The upper dust
layer mainly originated from a dust storm that occurred in the Taklimakan
Desert 2–3 days after the Gobi dust storm generation. The upper dust cloud
was transported in higher altitudes above the major clouds layer during the
Trans-Pacific transport. It therefore has remained unmixed with the Asian
air pollutants and almost unaffected by wet removal. The decay of its
concentration level was small (only one-half after its long-distance
transport crossing the Pacific). Our dust budget analysis revealed that the
Asian dust flux passing through the longitude plane of 140° E was 2.1 Tg,
and one third of that arrived North America. The cases analyzed in this
study revealed that, while the Gobi Desert is an important source that can
contribute to the long-range dust transport, the Taklimakan Desert appears
to be another important source that can contribute to the dust transport
occurring particularly at high altitudes. |
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