气象研究与应用2018，Vol.39Issue(1)：38-45,8.
广西一次槽前型暖区飑线的中尺度分析
A mesoscale analysis on a warm-sector squall line in front of the trough occurred in Guangxi
摘要
Abstract
By using intensive observation data of automatic station, conventional observation data, NCEP data, FY2G data, and radar data, the warm-sector squall line occurred in Guangxi on April 22, 2016 was analyzed. The results showed as follows: the squall line occurred in the front of high-level trough, areas near low-level jet and warm-sector areas were far away from ground stationary front. (1) The squall line moved at a high speed (100 km/h), which caused wet convection weather (thunderstorm gale and short-term heavy rain). Pressure reduced before the squall line crossed; the temperature and dew point plunged, pressure surged, wind shifted, and wind speed jumped when the squall line passed however, the pressure reduced again after it passed. The squall line showed other characteristics of squall line mesosystem such as wake low, thunderstorm high, squall front, and pre-squall low. (2) The squall line occurred when the 500hPa high-level trough eastward was steepening. The trigger of initial convections of squall-A closely related to surface convergence line ahead of the Yungui quasi-stationary front, while initial convections of squall -B were triggered by dew -point front situated between Yuxi and Honghe,convergence line of southwest, and southeast wind ahead of the front. After that, the convections moved southeastward along with high -level trough and middle -level basic flow then influenced Guangxi. (3)Although moving without cold front, this warm-sector squall line maintained in favorable environment,such as strong vertical wind shear, high CAPE, "trumpet" shape of stratification curve, and dew-point curve composing (convective instability). Additionally, surface convergence line and warm shear on the boundary layer were also important for developing and maintaining of the squall line.关键词
暖区/飑线/地面辐合线/云贵准静止锋Key words
warm-sector Area/squall line/surface convergence line/Yungui Quasi-Stationary Front分类
天文与地球科学引用本文复制引用
林确略,邓雅倩,陈明璐,陆秋霖,苏尉宣..广西一次槽前型暖区飑线的中尺度分析[J].气象研究与应用,2018,39(1):38-45,8.基金项目
玉林市气象局自立项目(2016[01])和中国气象局预报员专项(CMAYBY2015-057). （2016[01]）
