2017年7月6-9日九江市柴桑区晴空连续大风成因分析  

Chaisang District, Jiujiang City, July 6-9, 2017 Cause Analysis of Continuous Gale in Clear Sky

作　　者：何灵芬 徐韬 HE Lingfen;XU Tao(Meteorological Bureau of Chaisang District of Jiujiang,332100,Jiujiang,Jiangxi,PRC;Meteorological Bureau of Jinxian County of Nanchang,331700,Nanchang,PRC)

机构地区：[1]九江市柴桑区气象局,江西九江332100 [2]南昌市进贤县气象局,南昌331700

出　　处：《江西科学》2019年第6期930-934,共5页Jiangxi Science

摘　　要：对2017年7月6-9日柴桑区地面大风的影响机制进行了综合分析,主要结论有:此次晴空连续偏南大风的原因是6-9日夜间柴桑区高空和近地层出现强辐散,中层辐合,小尺度气压扰动,低空出现西南急流的脉动,动量下传,同时柴桑区的特殊地形,东倚庐山,西靠岷山,中间为盆地,形成东北-西南向的峡谷,南端德安县宽,北面柴桑区窄,如果吹西南风,柴桑区正处于喇叭口的出口处,有明显狭管效应。而东面庐山的阻挡与热力作用也会增强经过柴桑区的西南风,利于偏南大风的形成。This paper makes a comprehensive analysis of the influencing mechanism of the Surface Gale in Chaisang area from July 6 to 9, 2017. The main conclusions are as follows: the reason for the continuous South gale in the clear sky is the strong divergence, convergence in the middle layer, small-scale pressure disturbance, the fluctuation of southwest jet at low altitude and the downward transmission of momentum in the upper and near strata of Chaisang area during the night of June 9. At the same time, the special topography of Chai-Sang area, which relies on Lushan Mountain in the East and Minshan Mountain in the west, has a basin in the middle, forming a northeast-southwest canyon. The southern end of De’an County is wide, and the northern Chai-Sang area is narrow. If the southwest wind blows, Chai-Sang area is at the exit of the trumpet mouth, with obvious narrow tube effect. The blocking and thermodynamic effects of the Lushan Mountains on the East will also enhance the southwest wind passing through the Chaishang area, which is conducive to the formation of the southerly gale.

关 键 词：西南大风 特殊地形 狭管效应 辐合辐散 小尺度扰动 

分 类 号：P458.123[天文地球—大气科学及气象学]