Possible Impact of the Summer North Atlantic Oscillation on Extreme Hot Events in China  

作　　者：SUN Jian-Qi 

机构地区：[1]Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029, China

出　　处：《Atmospheric and Oceanic Science Letters》2012年第3期231-234,共4页大气和海洋科学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.40905041);the National Basic Research Program of China (Grant No. 2012CB955401);the "Strategic Priority Research Program-Climate Change: Carbon Budget and Relevant Issues" of the Chinese Academy of Sciences (Grant No. XDA05090306)

摘　　要：This paper reveals that the summer North Atlantic Oscillation (SNAO) is closely related to the extreme hot event (EHE) variability in China during the period of 1979 2009, with a positive-phase (negative-phase) SNAO corresponding to less (more) EHEs in northern China. The summer circulation anomalies associated with the SNAO give further confirmation of the above relationship. In a positive-phase (negative-phase) SNAO year, there is an anomalous cyclone (anticyclone) over central East Asia, which can increase (decrease) the total cloud cover over this region. Such changes of the total cloud cover can then decrease (increase) the solar radiation reaching the surface, which is consequently unfavorable (favorable) to the formation of EHEs over northern China.This paper reveals that the summer North Atlantic Oscillation （SNAO） is closely related to the extreme hot event （EHE） variability in China during the period of 1979 2009, with a positive-phase （negative-phase） SNAO corresponding to less （more） EHEs in northern China. The summer circulation anomalies associated with the SNAO give further confirmation of the above relationship. In a positive-phase （negative-phase） SNAO year, there is an anomalous cyclone （anticyclone） over central East Asia, which can increase （decrease） the total cloud cover over this region. Such changes of the total cloud cover can then decrease （increase） the solar radiation reaching the surface, which is consequently unfavorable （favorable） to the formation of EHEs over northern China.

关 键 词：summer North Atlantic Oscillation extreme hot events total cloud cover solar radiation 

分 类 号：P732.6[天文地球—海洋科学] P425.55