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

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Title
Multidecadal Regime Shifts in North Pacific Subtropical Mode Water Formation in a Coupled Atmosphere-Ocean-Sea Ice Model
Author(s)
Kim, Sang-Yeob; Kwon, Young-Oh; Wonsun Park; Lee, Ho Jin
Publication Date
2022-10
Journal
GEOPHYSICAL RESEARCH LETTERS, v.49, no.19
Publisher
AMER GEOPHYSICAL UNION
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.
URI
https://pr.ibs.re.kr/handle/8788114/12652
DOI
10.1029/2022GL099406
ISSN
0094-8276
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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