全球环流异常特征及其与中国气候变化的关系  

Characteristics of global circulation anomaly and tis impact on the climate change in China

作　　者：孙杨青[1] 万仕全[1] 钱忠华[1] 

机构地区：[1]扬州大学物理科学与技术学院,江苏扬州225002

出　　处：《扬州大学学报（自然科学版）》2013年第1期27-32,共6页Journal of Yangzhou University：Natural Science Edition

基　　金：全球变化研究国家重大科学研究计划项目(2012CB955902);国家自然科学基金资助项目(40930952;41005041;41175067);公益性行业科研专项基金(GYHY201106016;GYHY201106015)

摘　　要：采用球谐函数展开方法对1948—2009年NCEP/NCAR(美国国家环境预报中心/美国国家大气研究中心)高度距平场再分析资料进行分析,通过"时间-高度"的二维坐标方式考察环流异常的立体结构特征,发现南、北半球大气环流在1980年前后发生了明显的正负位相(槽脊)突变.与中国冬季温度和夏季降水的相关分析表明:前期春、夏、秋季的北半球环流纬向正异常越强,华北地区的冬季气温越高,反之越低;前一年冬季环流异常与华北—河套地区的夏季降水呈现反相关,春季北半球均匀异常环流与华北及西南夏季降水呈现反相关;大气环流的纬向异常与华北—河套地区的夏季降水呈现正相关,而同期环流异常与华北东部、西南及江南北部的降水呈现负相关.In this paper, by using the method of spherical function analysis, the circulation feature of climate anomaly height field from 1948 to 2009 is analyzed. Based on the space-time coordinate, the author studies the three-dimensional structure of circulation anomalies. It is found that the phase （slot ridge） of circulation feature of climate anomaly height filed in both northern and southern hemispheres has changed obviously about 1980. By analyzing the delay-dependent correlations between the circulation anomalies and summer precipitation as well as winter temperature, it finds that the stronger of positive circulation anomalies, the higher of winter temperature. The results show that the relationship between zonal circulation anomalies in spring, summer and autumn in northern hemispheres and winter temperature in North China is positive correlation. For precipitation, summer precipitation in North China and the circulation anomalies during the previous winter, as well as the average circulation anomalies during spring, were negative correlation. While the relationship between the zonal circulation anomalies in spring and the summer precipitation in North China was positive correlation. The correlations between circulation anomalies and precipitation in summer were negative in east of the North China, southwest and south of the Yangtze River.

关 键 词：环流异常 球谐函数法 温度 降水 

分 类 号：P421.3[天文地球—大气科学及气象学]