Multidecadal Regime Shifts in North Pacific Subtropical Mode Water Formation in a Coupled Atmosphere‐Ocean‐Sea Ice Model.

Kim, Sang‐Yeob, Kwon, Young‐Oh, Park, Wonsun and Lee, Ho Jin (2022) Multidecadal Regime Shifts in North Pacific Subtropical Mode Water Formation in a Coupled Atmosphere‐Ocean‐Sea Ice Model. Geophysical Research Letters, 49 (19). Art.Nr. e2022GL099406. DOI 10.1029/2022GL099406.

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Supplementary data:

Abstract

A regime shift in the formation mechanisms of the North Pacific subtropical mode water (NPSTMW) and its causes were investigated using a 2,000-year-long pre-industrial control simulation of a fully coupled atmosphere-ocean-sea ice model. The volume budget analysis revealed that the air-sea flux and ocean dynamics (OD) were the two primary driving mechanisms for NPSTMW formation, but their relative importance has periodically alternated in multidecadal timescales of approximately 50–70 years. The regime shift of the NPSTMW formation was closely related to the meridional (50 years) and zonal (70 years) movements of the Aleutian Low (AL). When AL shifted to the south or east, it induces the sea surface height anomalies propagating westward from the central North Pacific and preconditions the NPSTMW formation, thus the OD become relatively more important.

Key Points:
- Driving mechanisms for the North Pacific subtropical mode water formation exhibit a regime shift with a periodicity of about 50–70 years
- Multidecadal regime shifts are associated with meridional and zonal shifts in the Aleutian Low (AL)
- Position shift of the AL affects the variability of the local air-sea flux and remotely driven oceanic dynamics

Document Type: Article
Keywords: Atmosphere-Ocean; sea ice; model
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Woods Hole
Main POF Topic: PT2: Ocean and Cryosphere
Refereed: Yes
Open Access Journal?: No
Publisher: Wiley, AGU (American Geophysical Union)
Related URLs:
Expeditions/Models/Experiments:
Date Deposited: 11 Oct 2022 08:34
Last Modified: 07 Feb 2024 15:42
URI: https://oceanrep.geomar.de/id/eprint/57105

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