globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-016-3340-z
Scopus记录号: 2-s2.0-84984878627
论文题名:
Lessened response of boreal winter stratospheric polar vortex to El Niño in recent decades
作者: Hu J.; Li T.; Xu H.; Yang S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期:2017-01-02
起始页码: 263
结束页码: 278
语种: 英语
英文关键词: Decadal variation ; El Niño teleconnection ; Planetary wave activity ; Stratospheric response
英文摘要: The decadal change of El Niño teleconnection and the corresponding response of the boreal winter stratospheric polar vortex are investigated through the composite analysis of El Niño events during the two periods 1958–78 and 1979–2015. It is found that, during the period 1958–78, El Niño generates an anomalous Aleutian low in the mid troposphere extending from northeastern Eurasia to the northeastern Pacific with the most significant center in the northwestern Pacific. The anomalous Aleutian low results in a marked increase in planetary wavenumber 1 but a weak decrease in wavenumber 2 from the upper troposphere to lower stratosphere. The Eliassen–Palm (EP) flux of planetary waves converges at the high latitudes in the stratosphere and brings about a significantly weakened polar vortex. In contrast, during the period 1979–2015, the wintertime El Niño-related Aleutian low shifts eastward into the northeastern Pacific. This variation in tropospheric El Niño teleconnection leads to a dramatic decrease in planetary wavenumber 2 but a relatively weak increase in wavenumber 1. Furthermore, the magnitude of the decrease of wavenumber-2 EP flux is comparable to the increase of wavenumber-1 EP flux in the stratosphere. Consequently, the stratospheric response lessens dramatically, showing a less disturbed and slightly enhanced polar vortex. The lessened stratospheric response is quite obvious in the stratosphere below 10 hPa regardless of the long-term trend being removed or not, indicating a dominant role of El Niño in the wintertime variability of lower polar stratosphere. © 2016, Springer-Verlag Berlin Heidelberg.
资助项目: NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53157
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作者单位: Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC–FEMD), Nanjing University of Information Science and Technology, Nanjing, China; International Pacific Research Center and Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, HI, United States

Recommended Citation:
Hu J.,Li T.,Xu H.,et al. Lessened response of boreal winter stratospheric polar vortex to El Niño in recent decades[J]. Climate Dynamics,2017-01-01,49(2017-01-02)
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