| 天气与气候 |
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| Physical Parameter Fields Structure of Dust-Storm Event in Late Spring to Early Summer in Margin Region of Mu Us Desert |
| HE Hao; LIU Yu; TENG Yue; HUANG Bao-xia |
| Shaanxi Specialized Meteorological Observatory, Xian 710014, China |
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Abstract Dust storm event is a kind of proper harmful weather phenomenon in late spring to early summer in the margin region of Mu Us desert. Based on the ECMWF re-analysis data of fields of pressure and physical parameters and the data of five dust-storm cases, the characteristics of pressure field and spatial structure of physical parameter fields at different layers during the dust-storm event are analyzed. The results show that Mongolia anticyclone is the main synoptic system impacting dust-storm. During the dust-storm event, the front of Mongolia anticyclone is controlled by the wide strong northwest wind from surface to 200 hPa. The physical property of it is dry and cold. The front of Mongolia anticyclone is the northeast-southwest frontal surface, which is not only a dense belt but also a sensitive region of the physical parameters. In this region, the vertical velocity field is upward, the field of vorticity is positive and the field of divergence difference between 200 hPa and 850 hPa is positive. All these physical parameters have a promotive and fortified effect on the occurrence of dust-storm.
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Received: 01 January 1900
Published: 20 November 2007
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2007, Vol. 27 
