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Interaction Between Typhoon Vicente (1208) and the Western Pacific Subtropical High During the Beijing Extreme Rainfall of 21 July 2012
Authors:WEN Yongren  XUE Lin  LI Ying  WEI Na and L&#; Aimin
Affiliation:Yunnan Meteorological Service Center, Kunming 650034;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081;Shanghai Typhoon Institute, China Meteorological Administration, Shanghai 200030;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081;National Meteorological Center, China Meteorological Administration, Beijing 100081
Abstract:The heaviest rainfall in recent six decades fell in Beijing on 21 July 2012, reaching a record of 460 mm within 18 h. This rainfall was a typical remote precipitation event related to Typhoon Vicente (1208). Observational analysis indicates that Vicente influenced distant heavy rainfall by transporting water vapor northward to the Beijing area. This moisture transport was mainly driven by the interaction between Vicente and the western Pacific subtropical high (WPSH) associated with the formation of a low-level southeasterly moisture channel. A set of numerical sensitivity experiments were performed with prescribed typhoons of different intensities to investigate the interaction between Vicente and the WPSH and its effects on this rainstorm process. The results indicate that the WPSH interacting with typhoons of different intensities may exert varying degrees of influence on the development of a southeasterly moisture channel, resulting in a change in rain rate and location over the Beijing area. Specifically, in the presence of an enhanced typhoon, the WPSH shows remarkable withdrawal to the east, which is favorable for a northward extension of the southeasterly moisture channel, thereby increasing moisture supply for the rainstorm. The WPSH tends to stretch westward in a zonal pattern if the typhoon is weakened or removed, hindering the northward extension of the moisture channel. Thus, the rainfall area may be expected to expand or contract, with corresponding increases or decreases in rain rate over the Beijing area with a strengthened or weakened typhoon, respectively.
Keywords:typhoon  remote precipitation  subtropical high  moisture transport
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