1954-2005年长江以北地区初霜期变化趋势  

Characteristics of Interdecadal Variations in First-Frost Date in Northern China During 1954-2005

作　　者：李想[1,2,3] 陈丽娟[1] 张培群[1] 

机构地区：[1]中国气象局国家气候中心,北京100081 [2]中国气象科学研究院,北京100081 [3]中国科学院研究生院,北京100049

出　　处：《气候变化研究进展》2008年第1期21-25,共5页Climate Change Research

基　　金：中国气象局气象新技术推广项目(CMATG2007M04);中国气象局多轨道业务建设项目“气候模式产品在区域气候预测业务中的应用”资助

摘　　要：采用长江以北地区65个测站1954—2005年秋冬季逐日地面最低温度资料,计算分析长江以北地区初霜出现日期的年代际时空变化特征。结果表明:中国北方地区初霜是由北向南逐渐出现的,初霜发生日期具有明显的年代际变化特征,在20世纪90年代之后,大部分地区初霜日期偏晚的年份逐渐增多。中国北方地区初霜发生日期的早晚与北极涛动的强弱密切相关:当北极涛动处于正位相时,北半球以纬向型环流为主,中国北方大部分地区的初霜期偏晚;反之,当北极涛动处于负位相时,北半球以经向型环流为主,中国北方大部分地区的初霜期偏早。The daily minimum temperature data at 65 stations from 1954 to 2005 and the definition of first-frost date （first day in autumn and winter when the ground surface minimum temperature is equal or less than 0℃ ） were used to study the characteristics of interdecadal variations in the first-frost date over northern China. Results show that the first-frost in northern China occurred successively from north to south and the date of the first-frost had remarkably interdecadal variation characteristics, which were not totally identical in the different regions. After the 1990s, the late first-frost years have increased in most regions. Further analysis show that there was a close relationship between first-frost date and Arctic Oscillation Index （AOI）. If the AOI was in a positive phase, then the zonally atmospheric circulation dominated in the Northern Hemisphere, and the first-frost was frequently later than normal, and vice versa.

关 键 词：初霜期 年代际变化 北极涛动 长江以北 

分 类 号：P467[天文地球—大气科学及气象学]