文献类型：期刊文献

中文题名：2011年11月我国降水异常特征及成因分析

英文题名：Analysis of rainfall anomaly and its cause in November 2011 in China

作者：王艳姣[1,2] 闫峰[3]

第一作者：王艳姣

机构：[1]中国气象局农业气象保障与应用技术重点开放实验室;[2]中国气象局国家气候中心;[3]中国林业科学研究院荒漠化研究所

年份：2014

卷号：23

期号：1

起止页码：100-107

中文期刊名：自然灾害学报

外文期刊名：Journal of Natural Disasters

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：中国气象局农业气象保障与应用技术重点开放实验室开放基金项目(AMF201204;AMF201107);国家自然科学基金项目(41301458);中国气象局公益性行业专项(GYHY201206013)

语种：中文

中文关键词：降水异常;北极涛动;拉尼娜

外文关键词：rainfall anomaly, arctic oscillation; La Nina

分类号：P46

摘要：利用NCEP再分析资料和我国723个台站月降水量等资料,分析了2011年11月我国降水异常偏多和大尺度环流特征,重点分析了拉尼娜事件和北极涛动(AO)对我国降水和大气环流异常的影响。结果表明,受拉尼娜和AO持续正异常的影响,2011年11月欧亚地区大气环流出现异常,一方面印缅槽偏强、西太平洋副高西伸,这加强了来自孟加拉湾、南海和西太平洋的水汽向我国内陆输送;另一方面副热带西风急流加强,急流轴断裂,导致我国华西东北部至华北、华南沿海地区处于急流南侧的高层辐散区,加强了这两个地区高空的辐散和低空的辐合。由于水汽条件比较充足,加之环流异常提供了较好的水汽辐合抬升的动力条件,造成我国华西东北部至华北及华南沿海地区降水异常偏多。
Based on the NCEP reanalysis data and the monthly precipitation data of 723 meteorological stations,the characteristics of the rainfall anomalies in China in Nov. 2011 and the related large-scale atmosphere circulation over the Eurasia region were analyzed, and the effects of the La Nina event and Arctic oscillation on anomalies of rainfall and atmosphere circulation in China were studied. Results show that, affected by the La Nina event and the Arctic oscillation, atmosphere circulation over the Eurasia region appeared abnormal in November 2011. On one hand, the Indian Burma trough deepens and the west Pacific subtropical high extends westward, which strengthenes the transportation of the wet-warm air from the Bay of Bengal to the South China Sea and the west Pacific Ocean to inland of China. On the other hand, the strengthening of the subtropical westerly jet and the jet axis fracture make the regions from the northeastern West China to North China and coastal areas of South China lie in the high-level divergence regions of jet south side, which strengthens the divergence of upper air and convergence of lower air in these regions. Due to the enough vapor conditions combined with a better uplifting conditions of vapor, the precipitation is more than normal in these two regions.