Low-frequency variability enhancement of the midlatitude climate in an eddy-resolving coupled ocean-atmosphere model-part II: ocean mechanisms
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Published version
Author(s)
Kurashina, Ryosuke
Berloff, Pavel
Type
Journal Article
Abstract
This paper investigates the spatial inhomogeneity of the time-averaged, quasigeostrophic, double-gyre circulation response to fixed, realistic, large-scale modes of wind-stress forcing. While the companion paper of this study focused on understanding the anatomy of low-frequency, midlatitude climate variability in an idealised, eddy-resolving coupled model, this paper looked at understanding the nature of the wind-induced ocean gyre response using an ocean-only configuration of the same model. Our analysis revealed two, time-averaged responses to an east–west dipole, wind-stress curl anomaly in the ocean basin. Firstly, wind-stress anomalies in the western ocean basin led to changes in relative strength of the inertial recirculation zones and jet-axis tilt. This is consistent with an advection-dominated, nonlinear adjustment of the ocean gyres to anomalous forcing. Secondly, wind-stress curl anomalies in the eastern ocean basin was found to induce a largely independent response involving meridional shifts of the western boundary current extension (WBCE). The effects of time-averaged advection in this region are weak and the discovery of westward-propagating Rossby waves along the WBCE revealed the response is more akin to a baroclinic Rossby wave adjustment.
Date Issued
2023-08
Date Acceptance
2023-03-25
Citation
Climate Dynamics, 2023, 61 (3-4), pp.2025-2044
ISSN
0930-7575
Publisher
Springer
Start Page
2025
End Page
2044
Journal / Book Title
Climate Dynamics
Volume
61
Issue
3-4
Copyright Statement
© 2023 The Author(s). Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
License URL
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000972686400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
CIRCULATION
CURRENTS
DECADAL VARIABILITY
DRIVEN
DYNAMICS
KUROSHIO EXTENSION JET
Meteorology & Atmospheric Sciences
Physical Sciences
Science & Technology
WAVES
Publication Status
Published
Date Publish Online
2023-04-21