| DOI: | 10.1175/JCLI-D-16-0230.1
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| Scopus记录号: | 2-s2.0-85001103519
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| 论文题名: | The stratospheric pathway of La Niña |
| 作者: | Iza M.; Calvo N.; Manzini E.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2016
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| 卷: | 29, 期:24 | | 起始页码: | 8899
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| 结束页码: | 8914
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| 语种: | 英语
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| Scopus关键词: | Climatology
; Dynamics
; Upper atmosphere
; Arctic Oscillation
; Destructive interference
; ENSO
; La nina
; Planetary wave activity
; Quasi-biennial oscillation
; Stratospheric circulations
; Stratospheric sudden warmings
; Nickel
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| 英文摘要: | A Northern Hemisphere (NH) polar stratospheric pathway for La Niña events is established during wintertime based on reanalysis data for the 1958-2012 period. A robust polar stratospheric response is observed in the NH during strong La Niña events, characterized by a significantly stronger and cooler polar vortex. Significant wind anomalies reach the surface, and a robust impact on the North Atlantic-European (NAE) region is observed. A dynamical analysis reveals that the stronger polar stratospheric winds during La Niña winters are due to reduced upward planetary wave activity into the stratosphere. This finding is the result of destructive interference between the climatological and the anomalous La Niña tropospheric stationary eddies over the Pacific-North American region. In addition, the lack of a robust stratospheric signature during La Niña winters reported in previous studies is investigated. It is found that this is related to the lower threshold used to detect the events, which signature is consequently more prone to be obscured by the influence of other sources of variability. In particular, the occurrence of stratospheric sudden warmings (SSWs), partly linked to the phase of the quasi-biennial oscillation, modulates the observed stratospheric signal. In the case of La Niña winters defined by a lower threshold, a robust stratospheric cooling is found only in the absence of SSWs. Therefore, these results highlight the importance of using a relatively restrictive threshold to define La Niña events in order to obtain a robust surface response in the NAE region through the stratosphere. © 2016 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/50129
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Departamento de Física de la Tierra II, Universidad Complutense de Madrid, Madrid, Spain; Max Planck Institute for Meteorology, Hamburg, Germany
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| Recommended Citation: | |
Iza M.,Calvo N.,Manzini E.. The stratospheric pathway of La Niña[J]. Journal of Climate,2016-01-01,29(24)
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