| 天气与气候 |
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| Diagnostic Analysis and Weather Radar Observation of a Sand dust Storm in Autumn |
| WANG Fu cun; FU You zhi; LI Hong |
| 1.Lanzhou Institute of Arid Meteorology, China Meteorological Administration & Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province, Lanzhou 730020, China; 2.Zhangye Meteorological Bureau, Zhangye 734000, Gansu, China |
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Abstract Based on the reanalysis data of NCEP 1°×1°, the diagnostic analysis on potential vorticity, dry intrusion and vertical helicity of a sand-dust storm process occurred in the west of Gansu and Inner Mongolia and the south of Mongolia during period from Oct.5, 2006 to Oct.6, 2006 was conducted. The high potential vorticity air from upper level of troposphere extended downwards and southwards, its vertical component increased rapidly at steep of iso-entropy plane, promoting the rapid development of the cyclone and resulting in a low level jet; at the same time, the upper level dry air intruded southeastwards, leading to the intensive and long-lasting gale and sand-dust storm from west to east in the south of Mongolia. Whereas, the gale and sand-dust storm occurred in Hexi corridor and west of Inner Mongolia are resulted from sliding upwards cold-front, lasting short period and behaving relatively weak intensity. There is certain corresponding relation between the evolution of the vertical helicity and the occurrence of sand-dust storm. The vertical distribution of helicity over the sand-dust storm area is the negative value in the upper levels and the positive value in the low levels. The centre of intensive sand-dust storm is just down the maximum value of helicity. In addition, making use of the observational data by CINRAD-CC weather radar we have analyzed the β-medium scale double gust-front structure that resulted in sand-dust storm in Zhangye of Gansu. It was concluded that the genesis of the dust-storm in study region is generated form the second gust-front.
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Received: 29 April 2007
Published: 20 January 2008
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2008, Vol. 28 
