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  Interaction between decadal-to-multidecadal oceanic variability and sudden stratospheric warmings

Ayarzaguena, B., Manzini, E., Calvo, N., & Matei, D. (2021). Interaction between decadal-to-multidecadal oceanic variability and sudden stratospheric warmings. Annals of the New York Academy of Sciences, early view. doi:10.1111/nyas.14663.

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Genre: Journal Article

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 Creators:
Ayarzaguena, Blanca1, Author
Manzini, Elisa2, Author              
Calvo, Natalia1, Author
Matei, Daniela2, Author              
Affiliations:
1external, ou_persistent22              
2Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913553              

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 Abstract: Major sudden stratospheric warmings (SSWs) are the most important phenomena of the wintertime boreal stratospheric variability. During SSWs, the polar temperature increases abruptly, and easterlies prevail in the stratosphere. Their effects extend farther from the polar stratosphere, affecting near-surface circulation. According to observations, SSWs are not equally distributed in time, with decades experiencing very few events, while others experiencing SSWs almost every winter. Some sources of this SSW multidecadal variability can be traced back to sea surface temperature changes. Here, we investigate the effects of Pacific decadal variability (PDV) and Atlantic multidecadal variability (AMV) on SSWs. We use for the first time a large ensemble of historical experiments to examine the modulation of the frequency, tropospheric precursors, and impact of SSWs by the PDV and AMV. We find a strong impact of the PDV on the occurrence of SSWs, with a higher SSW frequency for the positive phase of the PDV. This PDV influence is mediated by constructive interference of PDV anomalies with tropospheric stationary waves. The main effect of AMV is, instead, a modulation of the tropospheric response to SSWs, a finding that can be useful for predicting the tropospheric fingerprint of SSWs.

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Language(s): eng - English
 Dates: 20212021-07-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000672456100001
DOI: 10.1111/nyas.14663
 Degree: -

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Project name : Blue Action
Grant ID : 727852
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Annals of the New York Academy of Sciences
  Other : Ann. N.Y. Acad. Sci.
Source Genre: Journal
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Publ. Info: New York : New York Academy of Sciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: early view Identifier: ISSN: 0077-8923
CoNE: https://pure.mpg.de/cone/journals/resource/954926958894_2