Spatiotemporal distribution of thunderstorm gust in the central and western Bohai Sea from 2018 to 2021
Using observation data from automatic meteorological stations,ADTD lightning positioning,and Doppler radar,we analyzed the intensity,spatiotemporal distribution and synoptic patterns of thunderstorm gust over the central and western Bohai Sea from 2018 to 2021.Based on the ERA5 reanalysis data and observation data from automatic meteorological stations,we also studied the characteristics and reference thresholds of physical quantities before the occurrence of widespread thunderstorms gust.The results indicate that the thunderstorm gust in the cen-tral and western Bohai Sea were mainly within the levels of 8 to 9,mostly occurred in the western and southern coastal areas of Bohai Sea,in June and July and in the early night.Among the thunderstorm gust events that lasted for 4 hours or more,the widespread thunderstorm gust events accounted for 86%.The synoptic systems at 500 hPa triggering thunderstorm gust were classified as the cold vortex type(46%),the high-level trough type(37%),the subtropical high edge type(12%),and the northwesterly flow type(5%).There was an obvious dry layer in the middle troposphere before the occurrence of widespread thunderstorm gust.When applying physical parameter thresholds for forecasting,the impact of synoptic systems and seasonal climate features needs to be considered.
国家科技期刊平台
NSTL
万方数据
