Seasonally-reversed trends in the subtropical Northwestern Pacific linked to asymmetric AMO influences.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
23 Aug 2023
23 Aug 2023
Historique:
received:
18
03
2023
accepted:
19
08
2023
medline:
24
8
2023
pubmed:
24
8
2023
entrez:
23
8
2023
Statut:
epublish
Résumé
This study identifies seasonally-reversed trends in Kuroshio strength and sea surface temperatures (SSTs) within the western North Pacific (WNP) since the 1990s, specifically in the 22° N-28° N region. These trends are characterized by increases during summer and decreases during winter. The seasonally-reversed trends are a result of the asymmetric responses of the WNP to a shift towards the positive phase of the Atlantic multidecadal oscillation (AMO) around the same period. The positive AMO induces an anomalous descent over the North Pacific during summer, leading to the direct strengthening of the gyre. However, during winter, it triggers an anomalous descent over the tropical Pacific, which excites a poleward wavetrain impacting the WNP and causing gyre weakening. The associated responses of the East Asian monsoon and China Coastal Current contribute to the observed seasonally-reversed SST trends. It is noteworthy that the seasonally-reversed trends in gyre strength and SSTs are predominantly observed north of 20° N in the WNP. This limitation arises because the anomalous cyclone within the winter poleward wavetrain is located north of this latitude boundary. Specifically, the clearest trends in gyre strength are observed in the northern segment of the Kuroshio, while the manifestation of SST trends in the Taiwan Strait could potentially be attributed to the influence and enhancement of the East Asian monsoon and the China Coastal Current. Due to the limited length of observational data, statistical significance of some of the signals discussed is rather limited. A CESM1 pacemaker experiments is further conducted to confirm the asymmetric responses of the North Pacific to the AMO between the summer and winter seasons.
Identifiants
pubmed: 37612406
doi: 10.1038/s41598-023-40979-9
pii: 10.1038/s41598-023-40979-9
pmc: PMC10447491
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
13735Subventions
Organisme : US's Climate and Large-Scale Dynamics Program of National Science Foundation
ID : AGS-2109539
Organisme : Central Weather Bureau of Taiwan
ID : IISI-202924
Informations de copyright
© 2023. Springer Nature Limited.
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