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| Titel |
Sand/dust storm processes in Northeast Asia and associated large-scale circulations |
| VerfasserIn |
Y. Q. Yang, Q. Hou, C. H. Zhou, H. L. Liu, Y. Q. Wang, T. Niu |
| 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 ; 8, no. 1 ; Nr. 8, no. 1 (2008-01-07), S.25-33 |
| Datensatznummer |
250005333
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| Publikation (Nr.) |
 copernicus.org/acp-8-25-2008.pdf |
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| Zusammenfassung |
| This paper introduces a definition of sand/dust storm process as a new standard
and idea of sand/dust storm (SDS) groups a number of SDS-events in Northeast
Asia. Based on the meteorological data from WMO/GOS network, 2456 Chinese surface stations and NCEP-NCAR reanalysis, the sand/dust storm
processes in Northeast Asia in spring 2000–2006 are investigated. And the
evolutions of anomalies of general circulation in the troposphere are
analyzed by comparing the spring having most and least occurrences of SDS in
year 2006 and 2003. Associated with the noticeably increased occurrence of
SDS processes in spring 2006, the anomalies in 3-D structure of general
circulation especially in the mid-and high latitudes of the Northen
Hemisphere (NH) are revealed. The transition period from the winter of 2005
to spring 2006 has witnessed a fast-developed high center over the
circumpolar vortex area in the upper troposphere, which pushes the polar
vortex more southwards to mid-latitudes with a more extensive area over the
east NH. In spring 2006, there are the significant circulation anomalies in
the middle troposphere from the Baikal Lake to northern China with a
stronger southward wind anomaly over Northeast Asia. Compared with a normal
year, stronger meridional wind with a southward wind anomaly also in the
lower troposphere prevail over the arid and semiarid regions in Mongolia and
northern China during spring 2006. The positive anomalies of surface high
pressure registered an abnormal high of 4–10 hPa in the Tamil Peninsular
make a stronger cold air source for the repeated cold air outbreak across
the desert areas in spring 2006 resulting in the most frequent SDS seasons
in the last 10 years in Northeast Asia. |
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