The changing relationship between the December North Atlantic Oscillation and the following February East Asian trough before and after the late 1980s
The changing relationship between the December North Atlantic Oscillation and the following February East Asian trough before and after the late 1980s
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20世纪80年代末前后12月北大西洋涛动与随后2月东亚低谷之间关系的变化
DOI：
10.1007/s00382-018-4165-8
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发表时间：
2018-12
期刊：
影响因子：
--
通讯作者：
Shaobo
中科院分区：
文献类型：
--
作者：
Feng;Guolin;Zhi;Rong;Gong;Zhiqiang;Zou;Meng;Qiao;Shaobo
本研究调查了过去60年中12月北大西洋涛动（NAO）与次年2月东亚大槽（EAT）之间不断变化的关系。我们发现12月NAO与后续……之间的关系
This study investigates the changing relationship between the December North Atlantic Oscillation (NAO) and the following February East Asian trough (EAT) throughout the past 60 years. We found that the relationship between the December NAO and the following February EAT is significantly enhanced after the late 1980s compared with the period before the late 1980s. The changing relationship mainly results from the enhanced relationship between the December NAO and the following February North Atlantic mid-latitudes’ sea surface temperature (SST) anomalies (NAMA) during the same period. During the period after the late 1980s, the persistent positive (negative) NAO pattern from December to the following January contributes to a positive (negative) NAMA, which reaches its maximum magnitude in the following February and excites an anomalous wave train along the North Atlantic and northern Eurasia, and significantly impacts the EAT. During the period before the late 1980s, the positive (negative) NAO pattern during December cannot persist into the following January, and the related positive (negative) NAMA is insignificant during the following February, causing the response of the simultaneous EAT to be insignificant as well. Moreover, there exists a significant impact of the December NAO on the December–January NAMA after the late 1980s, while the December–January NAMA is relatively less affected by the December NAO before the late 1980s. As a result, the simultaneous response of the atmospheric circulation anomalies to the December–January NAMA are evident before the late 1980s, and the positive (negative) NAMA can excite an anomalous wave train along the North Atlantic and northern Eurasia and significantly deepen (shallow) the downstream EAT. By contrast, after involving a feature of atmosphere forcing of SST, the simultaneous feedback of the December–January NAMA on EAT is significantly decreased after the 1980s.
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