ENSO-driven abrupt phase shift in North Atlantic oscillation in early January
Abstract El Niño-Southern Oscillation (ENSO) teleconnections exhibit a strong dependency on seasonally and intraseasonally varying mean states, leading to impactful short-term variations in regional climate. The North Atlantic Oscillation (NAO)-ENSO relation is a typical example, in that its phase r...
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ftdoajarticles:oai:doaj.org/article:1b15a9b1b9324d9193f54c00e66147c6 2023-07-30T04:05:12+02:00 ENSO-driven abrupt phase shift in North Atlantic oscillation in early January Xin Geng Jiuwei Zhao Jong-Seong Kug 2023-07-01T00:00:00Z https://doi.org/10.1038/s41612-023-00414-2 https://doaj.org/article/1b15a9b1b9324d9193f54c00e66147c6 EN eng Nature Portfolio https://doi.org/10.1038/s41612-023-00414-2 https://doaj.org/toc/2397-3722 doi:10.1038/s41612-023-00414-2 2397-3722 https://doaj.org/article/1b15a9b1b9324d9193f54c00e66147c6 npj Climate and Atmospheric Science, Vol 6, Iss 1, Pp 1-8 (2023) Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1038/s41612-023-00414-2 2023-07-16T00:38:39Z Abstract El Niño-Southern Oscillation (ENSO) teleconnections exhibit a strong dependency on seasonally and intraseasonally varying mean states, leading to impactful short-term variations in regional climate. The North Atlantic Oscillation (NAO)-ENSO relation is a typical example, in that its phase relationship reverses systematically between the early and late winter. Here based on observations and an ensemble of atmosphere-only climate model simulations, we reveal that this NAO phase reversal occurs synchronously in early January, showing strong abruptness. We demonstrate that this abrupt NAO phase reversal is caused by the change in ENSO-induced Rossby wave-propagating direction from northeastward to southeastward over the northeastern North American region, which is largely governed by a climatological alteration of the local jet meridional shear. We also provide evidence that the North Atlantic intrinsic eddy–low-frequency flow feedback further amplifies the NAO responses. This ENSO-related abrupt NAO change offers an avenue for intraseasonal climate forecasting in the Euro-Atlantic region. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles npj Climate and Atmospheric Science 6 1 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Xin Geng Jiuwei Zhao Jong-Seong Kug ENSO-driven abrupt phase shift in North Atlantic oscillation in early January |
topic_facet |
Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Abstract El Niño-Southern Oscillation (ENSO) teleconnections exhibit a strong dependency on seasonally and intraseasonally varying mean states, leading to impactful short-term variations in regional climate. The North Atlantic Oscillation (NAO)-ENSO relation is a typical example, in that its phase relationship reverses systematically between the early and late winter. Here based on observations and an ensemble of atmosphere-only climate model simulations, we reveal that this NAO phase reversal occurs synchronously in early January, showing strong abruptness. We demonstrate that this abrupt NAO phase reversal is caused by the change in ENSO-induced Rossby wave-propagating direction from northeastward to southeastward over the northeastern North American region, which is largely governed by a climatological alteration of the local jet meridional shear. We also provide evidence that the North Atlantic intrinsic eddy–low-frequency flow feedback further amplifies the NAO responses. This ENSO-related abrupt NAO change offers an avenue for intraseasonal climate forecasting in the Euro-Atlantic region. |
format |
Article in Journal/Newspaper |
author |
Xin Geng Jiuwei Zhao Jong-Seong Kug |
author_facet |
Xin Geng Jiuwei Zhao Jong-Seong Kug |
author_sort |
Xin Geng |
title |
ENSO-driven abrupt phase shift in North Atlantic oscillation in early January |
title_short |
ENSO-driven abrupt phase shift in North Atlantic oscillation in early January |
title_full |
ENSO-driven abrupt phase shift in North Atlantic oscillation in early January |
title_fullStr |
ENSO-driven abrupt phase shift in North Atlantic oscillation in early January |
title_full_unstemmed |
ENSO-driven abrupt phase shift in North Atlantic oscillation in early January |
title_sort |
enso-driven abrupt phase shift in north atlantic oscillation in early january |
publisher |
Nature Portfolio |
publishDate |
2023 |
url |
https://doi.org/10.1038/s41612-023-00414-2 https://doaj.org/article/1b15a9b1b9324d9193f54c00e66147c6 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
npj Climate and Atmospheric Science, Vol 6, Iss 1, Pp 1-8 (2023) |
op_relation |
https://doi.org/10.1038/s41612-023-00414-2 https://doaj.org/toc/2397-3722 doi:10.1038/s41612-023-00414-2 2397-3722 https://doaj.org/article/1b15a9b1b9324d9193f54c00e66147c6 |
op_doi |
https://doi.org/10.1038/s41612-023-00414-2 |
container_title |
npj Climate and Atmospheric Science |
container_volume |
6 |
container_issue |
1 |
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1772816974772961280 |