大气科学2012，Vol.36Issue(2)：283-296,14.DOI:10.3878/j.issn.1006-9895.2011.11044
20世纪70年代末前后北半球冬季对流层遥相关的时空演变研究
Temporal and Spatial Evolution of Teleconnection in the Troposphere during the Northern Hemisphere Winter at the End of the 1970s
摘要
Abstract
Using the NOAA monthly reanalysis geopotential height on 500 hPa, the sea surface temperature (SST) , the Pacific decadal oscillation (PDO) index and the triple mode of North Atlantic SST anomaly (ATM)index from 1950 to 2008, the temporal and spatial evolution of teleconnection in the troposphere during the Northern Hemisphere winter at the end of the 1970s is studied with correlation analysis method, Mann-Kendall analysis method, and coherence wavelet analysis method. The results indicate that the spatial distributions and temporal evolutions of Pacific - North American (PNA) , Eurasia - Pacific (EUP) , West Pacific (WP) , and West Atlantic (WA) teleconnection patterns change significantly at the end of the 1970s. The spatial distribution changes are found in the intensity and range of abnormal centers of these teleconnection patterns. On temporal evolution, the upward tendency of PNA and WP indexes and the downward tendency of EUP and WA indexes are also found. After the end of the 1970s, the key SST areas impacting on the 5 teleconnection patterns during the Northern Hemisphere winter have changed, in which those areas impacting on the EUP, and those areas in the Pacific impacting on WA have significantly decreased; those areas in the middle and southern Atlantic impacting on EA have obviously changed. On the time scale above 16 years, the variation of PDO is the main reason which leads to the variation of PNA, EUP, WP, and WA teleconnection patterns; the variation of ATM is the main reason which leads to the variation of WA and EA teleconnection patterns during the Northern Hemisphere winter.关键词
20世纪70年代末/北半球大气遥相关/时空演变/海表温度Key words
end of the 1970s/ atmospheric teleconnection in the Northern Hemisphere/ spatial - temporal evolution/ sea surface temperature分类
天文与地球科学引用本文复制引用
曹杰,李湘瑞,应俊..20世纪70年代末前后北半球冬季对流层遥相关的时空演变研究[J].大气科学,2012,36(2):283-296,14.基金项目
国家自然科学基金资助项目40875054、40725016,云南省自然科学基金重点项目2009CC002 （）
