干旱区生态环境知识资源中心(Arid): 20092013年中国西南地区连续干旱的成因分析

Arid

	20092013年中国西南地区连续干旱的成因分析
其他题名	Analysis on Causes of Continuous Drought in Southwest China During 2009 2013
	胡学平; 王式功; 许平平; 尚可政
来源期刊	气象
ISSN	1000-0526
出版年	2014
卷号	40 期号:10 页码:1216-1229
中文摘要	2009年以来，中国西南地区连续4年秋、冬、春季出现严重干旱，持续时间长、影响范围大、干旱程度重，给旱区农林业生产和人民生活带来严重影响，造成巨大的经济损失。本文利用多种资料从大尺度大气环流、水汽输送、太平洋及印度洋海温、平流层极涡等方面分析了此次连续干旱的原因。结果表明：南支槽强度偏弱、孟加拉湾水汽输送偏少以及弱极涡背景下，异常波活动造成的AO负异常引起的冷空气路径偏东是这4年持续干旱的共同特点。热带海表温度的异常变化对西南地区干旱的影响也不容忽视，主要表现在对孟加拉湾和南海水汽输送的阻碍上。La Nina事件中，热带印度洋冬、春季海表温度的异常变化对干旱影响更为突出。冬、春季平流层和对流层的动力耦合作用结果使得AO位相发生变化，其中异常负位相的强度及持续时间对这4年西南地区秋、冬、春连旱的影响显著。
英文摘要	Severe droughts occurred in Southwest China continuously in 4 years’autumn, winter, spring beginning from 2009. Because of the long duration, large scope and heavy degrees,the drought has caused huge economic losses,seriously impacting on agroforestry production and people’s life in arid zones. In this paper, the causes of the continuous drought are analyzed from the impacts of the anomalies of large-scale atmospheric circulation, water vapor transportation, the Pacific and Indian Ocean SST, stratospheric polar vortex strength by analyzing a variety of data. The results show that the common backgrounds of the 4 years’ continuous drought are weaker south branch trough, less water vapor transport over the Bay of Bengal and easterly cold air mass caused by AO negative anomalies which are produced by abnormal wave activities during weak polar vortex. The abnormal changes of tropical SST during the drought over Southwest China play important roles in blocking water vapor transport over the Bay of Bengal and South China Sea. In the La Nina event, the effect of the tropical Indian Ocean SST changes in winter and spring is more outstanding. The phase of AO is always changed by the dynamic couple between stratosphere and tropo- sphere in winter and spring, and the intensity and duration of the abnormally negative phase of AO have significant effects on the drought that occurred in Southwest China in the autumn, winter and spring of 4 consecutive years.
中文关键词	连续干旱 ; 南支槽 ; 水汽输送 ; 热带海表温度 ; 极涡
英文关键词	continuous drought south branch trough water vapor transportation tropical sea surface temperature polar vortex
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:5273185
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231525
作者单位	兰州大学大气科学学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	胡学平,王式功,许平平,等. 20092013年中国西南地区连续干旱的成因分析[J]. 兰州大学,2014,40(10):1216-1229.
APA	胡学平,王式功,许平平,&尚可政.(2014).20092013年中国西南地区连续干旱的成因分析.气象,40(10),1216-1229.
MLA	胡学平,et al."20092013年中国西南地区连续干旱的成因分析".气象 40.10(2014):1216-1229.