Cause Analysis of a Heavy Sandstorm

doi:10.11924/j.issn.1000-6850.casb15120118

Abstract

Abstract: In order to study the development mechanism of strong sandstorms in Hexi Corridor, according to the conventional meteorological data and data from NECP/NCAR, the authors analyzed the heavy sandstorm which occurred in April 23- 24, 2014 from the perspective of climate background, weather condition, the characteristic of ground meteorological elements of strong sandstorm and related physical factors. The results showed that: the strong cold air activity was an important reason for the sandstorm. The occurrence of sandstorm was accompanied by the dramatic cooling of ground, air pressure surge, and wind speed surge. A consistent upward movement appeared from the lower to the upper level when the sandstorm occurred, the vertical velocity from strong to weak and the sandstorm development process changing from outbreak to decline had a good corresponding relationship. The upper level jet stream center had a significant spread to the lower layer. The descent of the upper jet stream was an important symbol of momentum. There was a marked negative and positive characteristic of the vertical screw. Before the sandstorm occurred, the surface layer had an inversion layer, which was good to produce dry convection.

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