Physical Mechanism of the Impacts of the Tropical Atlantic Sea Surface Temperature on the Decadal Change of the Summer North Atlantic Oscillation  

作　　者：SUN Jian-Qi 

机构地区：[1]Nansen-Zhu International Research Centre,Institute of Atmospheric Physics, Chinese Academy of Sciences [2]Climate Change Research Center,Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2013年第5期365-368,共4页大气和海洋科学快报（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2012CB955401);the National Natural Science Foundation of China(Grant No.40905041)

摘　　要：In this study,physical mechanism of the impacts of the tropical Atlantic sea surface temperature(SST)on decadal change of the summer North Atlantic Oscillation(SNAO)was explored using an atmospheric general circulation model(AGCM)developed at the International Centre for Theoretical Physics(ICTP).The simulation results indicate that the decadal warming of the SST over the tropical Atlantic after the late 1970s could have significantly enhanced the convection over the region.This enhanced convection would have strengthened the local meridional circulation over the Eastern Atlantic-North Africa-Western Europe region,exciting a meridional teleconnection.This teleconnection might have brought the signal of the tropical Atlantic SST to the Extratropics,consequently activating the variability of the eastern part of the SNAO southern center,which led to an eastward shift of the SNAO southern center around the late 1970s.Such physical processes are highly consistent with the previous observations.In this study,physical mechanism of the impacts of the tropical Atlantic sea surface temperature （SST） on decadal change of the summer North Atlantic Oscillation （SNAO） was explored using an atmospheric general circulation model （AGCM） developed at the International Centre for Theoretical Physics （ICTP）.The simulation results indicate that the decadal warming of the SST over the tropical Atlantic after the late 1970s could have significantly enhanced the convection over the region.This enhanced convection would have strengthened the local meridional circulation over the Eastern Atlantic-North Africa-Western Europe region,exciting a meridional teleconnection.This teleconnection might have brought the signal of the tropical Atlantic SST to the Extratropics,consequently activating the variability of the eastern part of the SNAO southern center,which led to an eastward shift of the SNAO southern center around the late 1970s.Such physical processes are highly consistent with the previous observations.

关 键 词：summer North Atlantic Oscillation tropical Atlantic sea surface temperature TELECONNECTION decadal change SIMULATION 

分 类 号：P732[天文地球—海洋科学]