Characteristics and Synoptic Patterns of Regional Extreme Rainfall over the Central and Eastern Tibetan Plateau in Boreal Summer

In this research, the observation datasets from 106 gauge stations over central and eastern areas of Tibetan Plateau (TP) ERA (ECMWF Re-Analysis)-Interim reanalysis in summers 1981–2016 are used to study characteristics synoptic patterns extreme precipitation events TP. By using a modern statistical method, abnormal circulation at high, middle, low latitudes Northern Hemisphere during central-eastern discussed, physical mechanisms related investigated. The results show that largest amount is found southern TP, where frequency daily rainfall (exceeding 25 mm) all both obvious quasi-biweekly oscillation. When event threshold TP met more than 5 same time, with least three them being adjacent each other, determined as regional event. As such, 33 occur summer periods 1981–2016. According influence system, can be divided into types, namely plateau trough type, shear line vortex type. For South Asian high anomalously strong 100 hPa. other two slightly weaker usual. development dynamic disturbance strongest, reaching 200 type water vapor transported by westerly belt southwesterly flow Bay Bengal.