Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2019, Vol. 35 ›› Issue (18): 95-102.doi: 10.11924/j.issn.1000-6850.casb18120131

Special Issue: 农业气象

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Strong Sandstorm in Inner Mongolia on May 3, 2017: Causes Analysis

  

  • Received:2018-12-30 Revised:2019-03-15 Accepted:2019-03-25 Online:2019-07-01 Published:2019-07-01

Abstract: By using conventional observation data and NCEP (1°×1°) reanalysis data, the strong sandstorm process in Middle-west Inner Mongolia on May 3-4, 2017 is analyzed, and a preliminary discussion about its formation cause is made in this paper. The results showed that: (1) The Strong sandstorm process belongs to the type of common effects of the surface cold front and the Mongolia cyclone. The 500hPa trough, the Mongolia cyclone, and the surface cold front were the main influences systems of the strong sandstorm process; (2) Vorticity advection(dynamic factor)and temperature advection(thermal factor)played a significant role in the development and eastward movement of the cyclone, by analyzing the field of temperature-pressure and vorticity advection on the higher and lower levels. (3) The helicity was negative at higher levels over the strong sandstorm area and positive at lower levels. This vertical distribution of helicity made great contribution to the formation and the development of the strong sandstorm.