大气科学学报2012，Vol.35Issue(4)：448-457,10.
近50a来华北地区负积温变化特征
Characteristics of the negative accumulated temperature change in North China in recent 50 years
摘要
Abstract
Based on the observed daily temperature data from 62 stations in North China and NCEP/ NCAR reanalysis data from 1961 to 2008, the characteristics of negative accumulated temperature （NAT） change in North China and its circulation background were studied through methods such as EOF, REOF, and wavelet analysis. Results show that： 1 ） the NAT in North China increased consistent- ly, especially in Northern Shanxi Province ;2） The NAT in North China can be divided into two subdi- visions because the NAT increasing amplitudes were different in east and west. There were both abrupt changes in the west and east of North China, occurring in 1988 and 1986 respectively. A 3-6 years＇ cycle period was found in the west of North China while it was 2---4 years in the east of North China; 3 ） Changes of Northern Hemisphere winter atmospheric circulation had a close relation with the NAT anomalies in North China. Further composite analysis showed that cold periods were represented by stronger Siberian High, colder winter in North China and larger NAT＇ s absolute value near the ground while the main influence systems were the East Asian trough and Ural ridge in the middle troposphere.The stronger Ural ridge and the deeper East Asia trough made the cold air activity stronger in North China. In warm periods, it was the opposite situation.关键词
气候变化/负积温/突变/环流特征Key words
climate change/negative accumulated temperature/abrupt change/circulation features分类
天文与地球科学引用本文复制引用
高庆九,张荣,管兆勇..近50a来华北地区负积温变化特征[J].大气科学学报,2012,35(4):448-457,10.基金项目
公益性行业科研专项 （）
国家科技支撑计划项目 （）
江苏高校优势学科建设工程资助项目（PAPD）.国家自然科学基金会地球科学部南京信息工程大学大气资料服务中心提供NCEP/NCAR再分析资料 （）
中国气象局中国气象科学数据共享服务网提供相关数据.谨致谢忱! （）
