Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate

Abstract Quasi-decadal climate of the Kuroshio Extension (KE) is pivotal to understanding the North Pacific coupled ocean–atmosphere dynamics and their predictability. Recent observational studies suggest that extratropical-tropical coupling between the KE and the central tropical Pacific El Niño So...

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Autores principales:	Youngji Joh, Emanuele Di Lorenzo, Leo Siqueira, Benjamin P. Kirtman
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/759948bdcbdb4101911b3ea888e8f9f1
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spelling	oai:doaj.org-article:759948bdcbdb4101911b3ea888e8f9f12021-12-02T16:30:46ZEnhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate10.1038/s41598-021-85582-y2045-2322https://doaj.org/article/759948bdcbdb4101911b3ea888e8f9f12021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85582-yhttps://doaj.org/toc/2045-2322Abstract Quasi-decadal climate of the Kuroshio Extension (KE) is pivotal to understanding the North Pacific coupled ocean–atmosphere dynamics and their predictability. Recent observational studies suggest that extratropical-tropical coupling between the KE and the central tropical Pacific El Niño Southern Oscillation (CP-ENSO) leads to the observed preferred decadal time-scale of Pacific climate variability. By combining reanalysis data with numerical simulations from a high-resolution climate model and a linear inverse model (LIM), we confirm that KE and CP-ENSO dynamics are linked through extratropical-tropical teleconnections. Specifically, the atmospheric response to the KE excites Meridional Modes that energize the CP-ENSO (extratropicstropics), and in turn, CP-ENSO teleconnections energize the extratropical atmospheric forcing of the KE (tropicsextratropics). However, both observations and the model show that the KE/CP-ENSO coupling is non-stationary and has intensified in recent decades after the mid-1980. Given the short length of the observational and climate model record, it is difficult to attribute this shift to anthropogenic forcing. However, using a large-ensemble of the LIM we show that the intensification in the KE/CP-ENSO coupling after the mid-1980 is significant and linked to changes in the KE atmospheric downstream response, which exhibit a stronger imprint on the subtropical winds that excite the Pacific Meridional modes and CP-ENSO.Youngji JohEmanuele Di LorenzoLeo SiqueiraBenjamin P. KirtmanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Youngji Joh Emanuele Di Lorenzo Leo Siqueira Benjamin P. Kirtman Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate
description	Abstract Quasi-decadal climate of the Kuroshio Extension (KE) is pivotal to understanding the North Pacific coupled ocean–atmosphere dynamics and their predictability. Recent observational studies suggest that extratropical-tropical coupling between the KE and the central tropical Pacific El Niño Southern Oscillation (CP-ENSO) leads to the observed preferred decadal time-scale of Pacific climate variability. By combining reanalysis data with numerical simulations from a high-resolution climate model and a linear inverse model (LIM), we confirm that KE and CP-ENSO dynamics are linked through extratropical-tropical teleconnections. Specifically, the atmospheric response to the KE excites Meridional Modes that energize the CP-ENSO (extratropicstropics), and in turn, CP-ENSO teleconnections energize the extratropical atmospheric forcing of the KE (tropicsextratropics). However, both observations and the model show that the KE/CP-ENSO coupling is non-stationary and has intensified in recent decades after the mid-1980. Given the short length of the observational and climate model record, it is difficult to attribute this shift to anthropogenic forcing. However, using a large-ensemble of the LIM we show that the intensification in the KE/CP-ENSO coupling after the mid-1980 is significant and linked to changes in the KE atmospheric downstream response, which exhibit a stronger imprint on the subtropical winds that excite the Pacific Meridional modes and CP-ENSO.
format	article
author	Youngji Joh Emanuele Di Lorenzo Leo Siqueira Benjamin P. Kirtman
author_facet	Youngji Joh Emanuele Di Lorenzo Leo Siqueira Benjamin P. Kirtman
author_sort	Youngji Joh
title	Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate
title_short	Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate
title_full	Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate
title_fullStr	Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate
title_full_unstemmed	Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate
title_sort	enhanced interactions of kuroshio extension with tropical pacific in a changing climate
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/759948bdcbdb4101911b3ea888e8f9f1
work_keys_str_mv	AT youngjijoh enhancedinteractionsofkuroshioextensionwithtropicalpacificinachangingclimate AT emanueledilorenzo enhancedinteractionsofkuroshioextensionwithtropicalpacificinachangingclimate AT leosiqueira enhancedinteractionsofkuroshioextensionwithtropicalpacificinachangingclimate AT benjaminpkirtman enhancedinteractionsofkuroshioextensionwithtropicalpacificinachangingclimate
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Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate

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