WP和NAO对中国东南部冬季温度的协同影响  

Synergistic effects of WP and NAO on winter surface temperature in southeastern China

作　　者：施春华[1] 孙伟佳[1] 郭栋[1] SHI Chunhua;SUN Weijia;GUO Dong(Key Laboratory of Meteorological Disaster,Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心,江苏南京210044

出　　处：《大气科学学报》2021年第3期394-404,共11页Transactions of Atmospheric Sciences

基　　金：国家重点研发计划项目(2018YFC1505602);国家自然科学基金资助项目(41875048,41675039)。

摘　　要：利用NCEP/NCAR和ERA-Interim再分析资料,通过多元线性回归等分析方法,研究了西太平洋遥相关型(Western Pacific teleconnection,WP)和北大西洋涛动(North Atlantic Oscillation,NAO)的不同配置对中国东南部冬季气温的影响。结果表明:WP正位相年,中低纬太平洋被异常暖性高压控制,其局地作用使得中国东南部温度偏高;NAO正位相年,其遥相关作用通过南、北两支波列,分别调控南、北支槽系统,协同作用使得中国东南部30°N附近温度偏低。考虑这两种遥相关型的共同作用,当WP和NAO同位相时,两者作用部分抵消,中国东南部温度变化不显著;当WP正位相、NAO负位相时,两者同步的加热效应使得中国东南部显著暖异常;当WP负位相、NAO正位相时,两者同步的冷却效应使得中国东南部显著冷异常。Based on the NCEP/NCAR and ERA-Interim reanalysis data,the multiple linear regression analysis is used to study impacts of different configurations of Western Pacific teleconnection(WP)and North Atlantic Oscillation(NAO)on winter surface temperature in southeastern China.Results show that in the positive phase year of WP,the middle and low latitudes Pacific Ocean is controlled by abnormal warm high,whose local effects make a warmer winter in southeastern China.In the positive phase year of NAO,the north and south teleconnection wave trains regulate the north and south branch troughs systems respectively,which synergistically make a colder winter around 30°N in southeastern China.Considering the interaction of the two teleconnection patterns,when WP and NAO are in the same phase,their opposite effects are partially offset,and the temperature change in southeastern China in winter is not significant.In positive WP phase and negative NAO phase,the synchronous heating effects make a warmer winter in southeastern China.In negative WP phase and positive NAO phase,the synchronous cooling effects make a colder winter in southeastern China.

关 键 词：WP NAO 中国东南部 冬季气温 

分 类 号：P73[天文地球—海洋科学]