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Parallel Comparison of the 1982/83, 1997/98 and 2015/16 Super El Nifios and Their Effects on the Extratropical Stratosphere 预览

Parallel Comparison of the 1982/83, 1997/98 and 2015/16 Super El Nifios and Their Effects on the Extratropical Stratosphere
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摘要 这研究使用多重海表面温度(SST ) 执行三超级 El Ni 的平行比较的数据集 ? 平流层上的 os 和他们的效果。结果显示出那,与平常的 El Ni 不同 ? os,温暖的 SST 异例在西方的热带太平洋最早出现并且先于超级 El Ni ? 到超过 18 个月的 o 山峰。在以前的冬季,相对 El Ni 的成熟阶段 ? o 作为一位先锋,向北和平的像摆动的发行量异例被观察。和平北方的美洲(PNA ) teleconnection 在成熟阶段期间出现在热带以外的对流层,尽管有紧张,以及带的位置之间的微妙的差别, PNA 脑叶。与在热带印度洋上的否定降雨反应有关,在 1997/98 的冬季的 PNA teleconnection 在三超级 El Ni 之中是最强壮的 ? os。北冬季平流层在极的帽子温度显示出大异例并且围绕天极西,如果从另外的因素的干扰线性地从发行量数据被过滤。在超级 El Ni 与积极 PNA 反应联系了 ? o 冬季,积极极的帽子温度异例并且围绕天极在东方异例在预定不同,也在三超级 El Ni 的成熟冬季被观察 ? os。在相对 1982/83 和 1997/98 事件的下一冬季的同温层的极的旋涡也反常地更弱、更温暖,并且同温层的发行量条件在跟随 2015/16 事件的成熟阶段的冬天尚待分晓。 This study uses multiple sea surface temperature (SST) datasets to perform a parallel comparison of three super El Nifios and their effects on the stratosphere. The results show that, different from ordinary El Nifios, warm SST anomalies appear earliest in the western tropical Pacific and precede the super El Nifio peak by more than 18 months. In the previous winter, relative to the mature phase of El Nifio, as a precursor, North Pacific Oscillation-like circulation anomalies are observed. A Pacific-North America (PNA) teleconnection appears in the extratropical troposphere during the mature phase, in spite of the subtle differences between the intensities, as well as the zonal position, of the PNA lobes. Related to the negative rainfall response over the tropical Indian Ocean, the PNA teleconnection in the winter of 1997/98 is the strongest among the three super El Nifios. The northern winter stratosphere shows large anomalies in the polar cap temperature and the circumpolar westerly, if the interferences from other factors are linearly filtered from the circulation data. Associated with the positive PNA response in a super El Nino winter, positive polar cap temperature anomalies and circumpolar easterly anomalies, though different in timing, are also observed in the mature winters of the three super El Nifios. The stratospheric polar vortex in the next winter relative to the 1982/83 and 1997/98 events is also anomalously weaker and warmer, and the stratospheric circulation conditions remain to be seen in the coming winter following the mature phase of the 2015/16 event.
作者 Jian RAO Rongcai REN Jian Rao[1]; Rongcai Ren[1][2]
出处 《大气科学进展:英文版》 SCIE CAS CSCD 2017年第9期1121-1133,共13页 Advances in Atmospheric Sciences
基金 supported by the Startup Foundation for Introducing Talent of Nanjing University of Information Science and Technology (Grant No. 2016r060) the National Key Research and Development Program (Grant No. 2016YFA0602104) the National Natural Science Foundation of China (Grant Nos. 41575041, 41430533 and 91437105) the Chinese Academy of Sciences (Grant No. XDA11010402) the China Meteorological Administration Special Public Welfare Research Fund (Grant No. GYHY201406001)
关键词 厄尔尼诺 平流层 温带 热带西太平洋 海温异常 成熟阶段 北太平洋涛动 阳性反应 super El Nifio, Pacific-North America (PNA) teleconnection, stratosphere, proceeding winter
作者简介 Corresponding author: Rongcai REN Email: rrc@lasg.iap.ac.cn
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