四川盆地东北部三次持续性暴雨过程水汽输送特征分析  

Analysis of water vapor transport characteristics of the three persistent rainstorm processes in northeastern Sichuan basin

作　　者：李晓容 高青云[1,2] 付世军 LI Xiaorong;GAO Qingyun;FU Shijun(Heavy Rain and Drought-Flood Disaters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072;Nanchong Meteorological Bureau,Nanchong 637000)

机构地区：[1]高原与盆地暴雨旱涝灾害四川省重点实验室,成都610072 [2]四川省南充市气象局,南充637000

出　　处：《暴雨灾害》2020年第3期234-240,共7页Torrential Rain and Disasters

基　　金：四川省重点实验室青年基金(2017-青年-20);南充市重大气象灾害预警与评估协同创新团队项目(2016-02)。

摘　　要：采用欧拉方法分析盆地东北部夏季3例持续性暴雨过程的水汽输送及其异常特征,并利用拉格朗日轨迹模式模拟计算了影响川东北的主要水汽输送通道,结果表明:(1)不同纬度多系统相互作用对水汽输送的加强,是造成2007年和2010年两例持续性暴雨水汽强度异常大的重要原因。2012年持续性暴雨个例中异常水汽主要源于孟加拉湾和南海两支水汽的共同作用。(2)水汽源地可追溯至孟加拉湾、南海、西太平洋和阿拉伯海。边界层的水汽输送更多是自南海沿华南地区进入川东北;中低层水汽输送路径,或以孟加拉湾进入川东北,或以南海进入川东北,或两者共同作用。在垂直方向上,多条水汽输送通道的相互叠加,促使川东北产生强的水汽通量。(3)每条水汽输送通道在不同的个例中主次作用不一致。同一个例的水汽输送通道并非固定不变,不同降雨阶段可能与不同水汽输送通道对应。In this paper,the Eulerian method is used to analyze the water vapor transport and its anomalous characteristics in three persistent rainstorms in the northeastern part of the basin in summer.The main water vapor transport channels affecting northeastern Sichuan are then simulated using Lagrangian trajectory model.The results show that:(1)The enhancement of water vapor transport by multi-system interaction at different latitudes is an important cause for the abnormal water vapor intensity of two persistent rainstorms in 2007 and 2010.In the case of the persistent heavy rain in 2012,the abnormal water vapor mainly originates from the interaction of the two vapor sources in the Bay of Bengal and the South China Sea.(2)The source of water vapor can be traced back to the Bay of Bengal,the South China Sea,the Western Pacific and the Arabian Sea.Water vapor transport in boundary layer is primarily from the South China Sea along the Southern China area in northeastern Sichuan Basin.The water vapor transport path in the lower and middle layers is either the Bay of Bengal to the northeast of Sichuan,or the South China Sea to the northeast of Sichuan,or both.During the persistent rainstorm,the superposition of several water vapor transport channels in the vertical direction promotes the strong water vapor flux in northeastern Sichuan.(3)Each water vapor transport channel has different functions in different events.The water vapor transport channel in the same event is not fixed,and different rainfall stages correspond to different water vapor transport channels.

关 键 词：水汽输送 持续性暴雨 盆地东北部 

分 类 号：P458.121.1[天文地球—大气科学及气象学]