摘要
用多种方法对近45年来广西秋季降水的异常变化特征及其气候背景进行了分析,并以此为基础,讨论了广西秋季异常干旱的形成原因及其影响因子。研究表明:秋季大陆副高强度偏强是导致广西秋季异常干旱的重要原因;广西秋季降水存在着年代际和年际两个显著振荡周期;以ENSO事件为代表的赤道太平洋地区热力振荡和太阳活动的周期性变化是这两种振荡的重要影响因子。
This paper uses synthesis, wavelet analysis and so on to conduct the climate conditions and characteristic analysis of the last 45a autunm precipitation, and discuss the possible causes and factors of the abnormal autumn drought in Guangxi. Result indicates that the Asia continent subtropical high intensified abnormally maybe the main reason that causes severe autumn drought in Guangxi. There are two distinct oscillations in the seasonal precipitation time serial. The ENSO event as the representation of the thennal oscillation in tropical Pacific Ocean, and the periodicity of the solar activity is important influence factors in these two kinds of oscillations.
出处
《自然灾害学报》
CSCD
北大核心
2008年第5期101-107,共7页
Journal of Natural Disasters
关键词
秋旱
气候背景
成因
突变
ENSO
太阳黑子
autumn drought
climatic background
cause of formation
abrupt change
ENSO
sunspot
