摘要
利用NCEP/NCAR再分析资料和华北夏季降水资料,研究了北极涛动的年代际变化及其与大气环流的关系,进而研究与华北夏季降水异常变化的联系。结果表明,北极涛动具有明显的年代际变化,并在1969年发生了气候突变。北极涛动年代际异常与亚洲中纬度高度场异常、850 hPa风场的年代际异常具有很好的一致性。在年代际尺度上,北极涛动与贝加尔湖地区阻塞高压发生频率、东亚夏季风强度和华北夏季降水的关系较为密切。
Using the NCEP/NCAR re-analytical dataset and summer precipitation data over North China, we define the Arctic Oscillation index according to the conception of Arctic oscillation proposed by Thompson and Wallace,and study the inter-decadal variation of Arctic oscillations and its relation with the general circulation of the atmosphere and the summer precipitation data over North China. Results show that the Arctic oscillation had obviously inter-decadal variation and an abrupt change in 1969. The inter-decadal variation of Arctic oscillation was in good agreement with the inter-decadal variations of the mid-latitude potential height anomaly field and the 850 hPa wind field over Asia. The Arctic oscillation was close related with the frequency of blocking high over the Baikal Lake area and the intensity of East Asian summer monsoon and summer precipitation over North China.
出处
《南京气象学院学报》
CSCD
北大核心
2005年第6期755-762,共8页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金资助项目(40170192)
江苏省气象灾害重点实验室(南京信息工程大学)开放课题(KLME0508)
关键词
北极涛动
大气环流
阻塞高压
东亚夏季风
华北夏季降水
年代际变化
Arctic oscillation
general circulation of atmosphere
blocking high
East Asian monsoon
summer precipitation over North China
inter-decadal variation
