北半球冬季大气环流遥相关的长期变化及其与我国气候变化的关系

SECULAR VARIATION OF WINTER ATMOSPHERIC TELECONNECTION PATTERN IN THE NORTHERN HEMISPHERE AND ITS RELATION WITH CHINA’S CLIMATE CHANGE

中文关键词:  冬季遥相关型  年代际变化  突变  气候变化

英文关键词:Winter teleconnetion  Interdecadal change  Abrupt change  Climate change

中文摘要:

      研究北半球冬季大气环流遥相关型的长期变化发现:WA,PNA型有明显趋势变化及年代际变化。WA型有明显负趋势,PNA型有正趋势,它们的强度突变分别发生于1980年代初(WA型1983年由强转弱)及1970年代中(PNA型1976年由弱转强)。与此同时,亚洲地区、亚欧地区的经向环流强度于1983年突然减弱。大气环流及遥相关型强度的这种年代际变化是中国冬季气候变化的一个重要原因。

英文摘要:

      The secular variation of the winter atmosphere circulation teleconnection pattern is studide in this paper.It is shown that Western Atlantic (WA),Pacific/North American (PNA) pattern had clearly trend and interdecadal change.The significant negative trend of the WA intensity index was abserved.however.the intensity of the PNA pattern had positive trend.The abrupt change of their intensity occurred in the early 1980's when WA pattern changed fron strong to weak and in the middle 1970's when PNA pattern changed fron weak to strong,respectively.Almost at the same time,the winter meridional circulation intensity in the area of Asia and Eurasia abruptly weaked in 1983.This interdecadal change of the intensity indices of the atmospheric and teleconnection pattern may be an important reason that causes climatic warming over China in winter.