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Plateau Meteorology  2019, Vol. 38 Issue (5): 1082-1090    DOI: 10.7522/j.issn.1000-0534.2018.00129
    
Analysis on Dynamic Condition of Three Wind Speed Fluctuation Events during An Extreme Gale Process in the West of the Hexi Corridor
ZHANG Wenjun, LI Jian, YANG Qinghua, TIAN Qingming, WANG Haiyan
Jiuquan Meteorological Bureau, Jiuquan 735000, Gansu, China
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Abstract  Using the data of automatic weather stations, the conventional observation and NCAR/NCEP reanalysis data, the influence system configuration, the characteristics of three wind speed fluctuation and dynamic Condition have been analyzed, In order to provide experience for the prediction of gale in special terrain conditions in Western Hexi corridor. The main results are as follows:With the development and strengthening of blocking anticyclone and Cold vortex abnormal moving southward, cool advection and downward momentum transfer of high low altitude are the key factors for the formation of continued gale in the west of the Hexi Corridor; The first gale fluctuation is mainly related to the ground pressure-swing wind, and the momentum downward transmission plays an important role in the second and third gale fluctuations; The descending motion with convergent flow field at the center and left side of the upper jet stream exit region can effectively transmit the momentum of high altitude below 500 hPa, The momentum exchange in the development of unstable stratification and the vertical motion caused by the thermal and dynamic conditions in the lower layer make the momentum in the middle and lower levels move down to the near ground. During the transit of the high-level trough, the configuration of the negative vorticity advection at high level and positive vorticity advection at low level formed by the forward inclining trough is very beneficial to the momentum spreaded downward from higher level, the greater the vorticity advection gradient in the vertical direction and the lower the gradient of large value center, the more likely it is to cause the occurrence of extreme wind near the surface in the west of the Hexi Corridor.
Key words:  Extreme gale      dynamic condition      isallobar wind      unstable stratification      momentum transportation downward     
Received:  08 October 2018      Published:  17 October 2019
ZTFLH:  P456.1  

Cite this article: 

ZHANG Wenjun, LI Jian, YANG Qinghua, TIAN Qingming, WANG Haiyan. Analysis on Dynamic Condition of Three Wind Speed Fluctuation Events during An Extreme Gale Process in the West of the Hexi Corridor. Plateau Meteorology, 2019, 38(5): 1082-1090.

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http://www.gyqx.ac.cn/EN/10.7522/j.issn.1000-0534.2018.00129     OR     http://www.gyqx.ac.cn/EN/Y2019/V38/I5/1082

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