Linking extreme precipitation during June in central eastern China to the East Asian jet stream changes

Extreme precipitation occurs under specific atmospheric circulation patterns. In this talk, we show the connection of extreme precipitation in central eastern China to the East Asian jet stream changes during June, the month with frequent occurrence of extreme precipitation. Two types of distinct East Asian jet stream configurations are detected for the occurrence of extreme precipitation. One is a latitudinal shift of the East Asian jet stream and the other is an intensification of the East Asian jet stream. The former corresponds to extreme precipitation to south of the Yangtze River and the latter corresponds to extreme precipitation along the Yangtze River. The changes in the location and intensity of the East Asian jet stream are associated with meridional wave patterns along East Asia and zonal wave patterns over mid-latitude Eurasia. The role of the western North Pacific subtropical high is robust but relatively larger for extreme precipitation south of the Yangtze River. The South Asian high plays an important role for extreme precipitation south of the Yangtze River, but its role is weak for extreme precipitation along the Yangtze River. Wind-induced temperature anomalies modulate the vertical change of the meridional height gradient over eastern China and thus contributes to the latitudinal shift and intensity change of the East Asian jet stream.