Observed Long-and Short-lived North Atlantic Oscillation Events:Role of the Stratosphere  被引量:1

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作  者:Jie SONG Jingjing ZHAO 

机构地区:[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [2]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出  处:《Advances in Atmospheric Sciences》2020年第12期1338-1358,共21页大气科学进展(英文版)

基  金:This work was supported by National Natural Science Foundation of China(Grant No.41790473).

摘  要:Utilizing three different sets of reanalysis data,this study examines the long-and short-lived observed positive North Atlantic Oscillation(NAO)events(referred to as NAO+_LE and NAO+_SE)and long-and short-lived observed negative NAO events(referred to as NAO−_LE and NAO−_SE).Composite results indicate that the NAO-like circulation anomalies associated with the long-lived NAO events can reach the stratosphere,while they are primarily confined to the troposphere in the short-lived NAO events.Thus,the coupling/connection of stratospheric and tropospheric circulation anomalies is much better(worse)in the long-lived(short-lived)NAO events.A series of modified stratospheric initial-value experiments conducted with a simplified model indicate that a better(worse)connection between stratospheric and tropospheric circulation anomalies in the initial-value fields tend to gradually induce the NAO-like tropospheric circulation anomalies in the troposphere on the subsequent days,and thus naturally elongate(reduce)the lifetimes of the original NAO events by altering the tropospheric synoptic eddy vorticity flux over the North Atlantic region.

关 键 词:North Atlantic Oscillation LIFETIMES STRATOSPHERE eddy forcing 

分 类 号:P732[天文地球—海洋科学]

 

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