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川渝地区夏季干旱气候特征及成因分析
Authors
刘晓东
方建刚
易俊莲
Publication date
1 January 2013
Publisher
Abstract
利用1979—2011年英国东英吉利大学气候研究中心(CRU)整理的地面月降水资料和日本气象厅(JMA)加工的全球高空等压面月平均气象场再分析资料,采用标准化降水指数(SPI),确定了川渝地区典型干旱年,讨论了川渝地区夏季典型干旱的气候特征及其大气环流特征。结果表明:川渝地区夏季典型干旱年具有气温高、降水少的气候特征;东亚中纬度盛行纬向气流,西风锋区偏北,冷空气多偏北东移,川渝地区及其我国北方大部分地区受大陆带状高压控制。500hPa带状高压与100hPa南亚高压中心位置基本一致,且500hPa高压中心与温度场的暖中心相对应,是持续性川渝夏季干旱具有近似正压结构的典型环流特征;同时川渝地区夏季干旱年对流层低层从云贵高原到四川盆地的西南气流明显偏弱,风场距平合成表明,云贵高原到川渝地区为东北距平风,距平风场上华南地区为明显的气旋式环流;川渝地区夏季典型干旱年整层西南气流水汽输送与常年比较明显偏小
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Last time updated on 03/02/2019