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  The stratospheric pathway of La Niña

Iza, M., Calvo, N., & Manzini, E. (2016). The stratospheric pathway of La Niña. Journal of Climate, 29, 8899-8914. doi:10.1175/JCLI-D-16-0230.1.

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資料種別: 学術論文

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 作成者:
Iza, M., 著者
Calvo, N., 著者
Manzini, Elisa1, 著者           
所属:
1Minerva Research Group Stratosphere and Climate, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_2301693              

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キーワード: Climatology; Dynamics; Upper atmosphere, Arctic Oscillation; Destructive interference; ENSO; La nina; Planetary wave activity; Quasi-biennial oscillation; Stratospheric circulations; Stratospheric sudden warmings, Nickel
 要旨: 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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言語: eng - English
 日付: 2016
 出版の状態: 出版
 ページ: -
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 査読: 査読あり
 識別子(DOI, ISBNなど): DOI: 10.1175/JCLI-D-16-0230.1
 学位: -

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出版物 1

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出版物名: Journal of Climate
種別: 学術雑誌
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出版社, 出版地: American Meteorological Society
ページ: - 巻号: 29 通巻号: - 開始・終了ページ: 8899 - 8914 識別子(ISBN, ISSN, DOIなど): ISSN: 08948755