大气科学2012，Vol.36Issue(5)：974-984,11.DOI:10.3878/j.issn.1006-9895.2012.11209
华南6月降水异常及其与东亚—太平洋遥相关的关系
Variation of South China Rainfall in June and Its Association with the East Asia-Pacific Teleconnection
摘要
Abstract
Based on the atmospheric circulation and rainfall data from 1959 to 2010, the variations of summer monsoon rainfall in the pre-rainy season in South China, i.e., rainfall in June, are analyzed in this study. The results show that the South China rainfall anomaly in June is significantly related to the East Asia-Pacific (EAP) teleconnection pattern with a correlation coefficient of 0.35. When the EAP index is positive, above-normal rainfall occurs over the areas south of the middle and lower reaches of the Yangtze River, and below-normal rainfall occurs over the areas between the Yangtze River and the Yellow River.Furthermore, the South China rainfall in June is divided into two time series: one is dependent on the EAP pattern and the other is independent of the EAP pattern. Comparisons between the two corresponding atmospheric circulation anomalies are followed up. The atmospheric circulation anomalies corresponding to rainfall time series dependent on the EAP pattern are similar to the distributions of EAP related circulation anomalies. When the EAP rainfall is above-normal, there is a combination of anti-cyclonic, cyclonic, and anti-cyclonic anomalies from low latitudes to high latitudes over the tropical western North Pacific and East Asia in the lower troposphere. The southerly and northerly anomalies meet over South China, leading to above-normal rainfall there. Meanwhile, the Huaihe River basin is occupied by northerly anomalies, resulting in below-normal rainfall. By contrast, the atmospheric anomalies corresponding to the above-normal rainfall time series that is independent of the EAP pattern are characterized by an obvious anti-cyclonic anomaly over the tropical western North Pacific and southwesterly anomalies over South China, which favor water vapor transportation and resultant above-normal rainfall.关键词
华南前汛期季风降水/东亚—太平洋遥相关/年际变化/环流异常Key words
summer monsoon rainfall in the pre-rainy season in South China, East Asia-Pacific teleconnection, interannual variation, circulation anomaly分类
天文与地球科学引用本文复制引用
陈锐丹,温之平,陆日宇,吴丽姬..华南6月降水异常及其与东亚—太平洋遥相关的关系[J].大气科学,2012,36(5):974-984,11.基金项目
国家自然科学基金资助项目40730951,国家重点基础研究发展规划项目2009CB421404,公益性行业(气象)科研专项GYHY201006021,国家自然科学基金资助项目40905025 （气象）
