Characteristics of Three Kinds of Typical Extreme Precipitation in Northeast Hubei in Spring
Based on the analysis of precipitation data from 1961 to 2020,in conjunction with NCEP/NCAR and ERA5 datasets,the study examines the correlation between the area of precipitation,the abnormality of the weather system,and physical quantities related to spring's extremely heavy precipitation events in northeast Hubei.The research categorizes and compares the relationship,yielding the following findings:(1)Three primary scenarios typify instances of extremely heavy precipitation:ground inverted trough,cold front,and warm low-pressure systems.Across all three types,the 500 hPa south branch trough moves sluggishly eastward.Abnormally robust high-pressure systems or high-pressure ridges are observed from the eastern regions of Hubei and northeast China to Japan.The interplay of the eastern high-pressure system and western low-pressure conditions contributes to prolonged precipitation.Additionally,the 850 hPa southerly jet exhibits exceptional strength,positioning northeast Hubei in the zone of shear convergence.Before the onset of heavy precipitation,abnormal ground heating and the development of low pressure create a conducive environment for the occurrence of extremely heavy precipitation.(2)The majority of spring's extremely heavy precipitation in northeast Hubei demonstrates a close association with anomalies in low-level water vapor and low-level vertical velocity.Particularly,the northeastern and surrounding areas of Hubei manifest an extensive area characterized by the summation of the negative values of low-level water vapor convergence and vertical velocity anomalies.
springextremely heavy precipitationabnormal degree
万方数据
维普
