Comparison of Key Convective Parameter Characteristics of Classified Heavy Precipitation in Qinghai in the last 18 Years
Using the 145 cases of short-term heavy precipitation in Qinghai counted by 50 national automatic stations during May-September from 2004 to 2021,which were classified into three categories according to the circulation situation,the characteristics of key convective parameters such as energy,water vapor,instability,and dynamics before the occurrence of heavy precipitation of different types were statistically compared,aiming to deepen the understanding of the characteristics of convective parameters of different types of heavy precipitation in Qinghai and to improve the forecasting and warning capability for this type of strong convective weather.The results showed that:(1)The 145 short-duration heavy precipitation events in Qinghai could be divided into 55 westerly flow-type,43 low vortex shear-type,and 47 subtropical high-pressure-type according to the circulation situation.The heavy precipitation of westerly flow-type was mainly distributed in the eastern agricultural area of Qinghai,the heavy precipitation of low vortex shear-type was centrally distributed in the south of Qingnan area,and the center of the heavy precipitation of subtropical high-pressure-type was distributed at 35.5 °N and decreases to the north and south.(2)The heavy precipitation of westerly flow-type had the highest convective effective potential energy and convective suppression energy.The heavy precipitation of low vortex shear-type required larger unstable layer junction conditions,namely,Shah's index,the maximum lifting index,and the temperature difference between 700hPa and 500hPa or 600hPa and 400hPa.The heavy precipitation of both westerly flow-type and low vortex shear-type could produce mixed strong convective weather with thunderstorms,gusty winds,and hail.The heavy precipitation of subtropical high-pressure-type,with higher water vapor conditions,resulted in strong convective weather dominated by short-term heavy precipitation.
QinghaiCirculation patternShort-term heavy precipitationConvective parameters
万方数据
维普
