Eddy-induced meridional transport variability at ocean western boundary

Zhai, Xiaoming and Yang, Zhibin (2022) Eddy-induced meridional transport variability at ocean western boundary. Ocean Modelling, 171. ISSN 1463-5003

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Abstract

Meridional transport variability induced by westward-propagating eddies impinging on the western boundary is investigated both analytically and numerically. A simple theory is first developed in the framework of the reduced-gravity model which relates eddy-induced meridional transport to eddy thickness anomalies propagated into the western boundary by long Rossby waves, and this is followed by a suite of numerical model experiments. It is found that eddies impinging on the western boundary excite boundary waves that propagate equatorward along the western boundary, which leads to coherent meridional overturning circulation (MOC) anomalies equatorward of the incident eddy field. The magnitude and duration of eddy-induced MOC anomalies are variable and irregular, ranging from less than 1 Sv to over 5 Sv and from less than 10 days to over 100 days. Importantly, these eddy-induced MOC anomalies lead to considerable meridional heat transport variability across the latitudes, with implications for seasonal and interannual climate variability and prediction.

Item Type: Article
Additional Information: Funding Information: XZ acknowledges support by a Royal Society International Exchanges Award, United Kingdom (IEC/NSFC/170007) and partial support from the U.K. Natural Environmental Research Council (NE/R000999/1). ZY is supported by a scholarship from the Chinese Scholarship Council and the National Natural Science Foundation of China (41776006). We thank the two anonymous reviewers for their insightful and constructive comments that led to significant improvement of this manuscript.
Uncontrolled Keywords: meridional overturning circulation,ocean eddy,ocean modelling,western boundary,computer science (miscellaneous),oceanography,geotechnical engineering and engineering geology,atmospheric science ,/dk/atira/pure/subjectarea/asjc/1700/1701
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 20 Jan 2022 11:30
Last Modified: 12 May 2022 08:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/83080
DOI: 10.1016/j.ocemod.2022.101960

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