摘要
用Mann-Kendall突变检验方法对北太平洋涛动10 a际气候突变进行的研究指出,在1976年左右存在着一次明显的气候突变,而突变前后大气环流场及遥相关型均发生了显著的变化.进而研究了北太平洋涛动突变前后我国冬季天气气候的变化特征.结果表明,突变前(后),我国冬季气温一致性偏低(高),且北方地区的变化明显大于南方;而降水则呈现出长江中下游地区偏多(少)和华南偏少(多)的反相特征.此外,冬季NPO突变前,北太平洋涛动以3 a和6～7 a的周期为主;突变后,3 a周期仍然存在,但5 a和10 a左右的周期开始占主导地位.
By use of Mann-Kendall abrupt change test,interdecadal abrupt climatic change of North Pacific oscillations(NPO) is studied.It is indicated that an obvious abrupt climate change occurred in 1976,and both the general circulation field and the teleconnection pattern changed remarkably before and after the abrupt change.Correspondingly,characters of wintertime weather and climate in China are also studied.Results show that before(after) the abrupt change,winter temperature in China was lower(higher) with changes in northern China larger than in southern China,and winter precipitation showed an out-of-phase character with more(less) rainfall in the middle-lower reaches of the Yangtze River and less(more) rainfall in South China.Besides,it is also pointed out that 3-year and 6-~7-year periods dominated before the NPO abrupt change,while 5-year and 10-year periods have begun to dominate after the abrupt change although 3-year period still exists.
出处
《南京气象学院学报》
CSCD
北大核心
2005年第2期180-188,共9页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金重点资助项目(40331010)
关键词
北太平洋涛动
大气环流
气候变化
突变
North Pacific Oscillation
general circulation
climate change
abrupt change
