Mesoscale Eddies in the Northwestern Pacific Ocean: Three-Dimensional Eddy Structures and Heat/Salt Transports.

Dong, Di, Brandt, Peter , Chang, Ping, Schütte, Florian, Yang, Xiaofeng, Yan, Jinhui and Zeng, Jisheng (2017) Mesoscale Eddies in the Northwestern Pacific Ocean: Three-Dimensional Eddy Structures and Heat/Salt Transports. Open Access Journal of Geophysical Research: Oceans, 122 (12). pp. 9795-9813. DOI 10.1002/2017JC013303.

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Abstract

The region encompassing the Kuroshio Extension (KE) in the Northwestern Pacific Ocean (25°N–45°N and 130°E–180°E) is one of the most eddy-energetic regions of the global ocean. The three-dimensional structures and transports of mesoscale eddies in this region are comprehensively investigated by combined use of satellite data and Argo profiles. With the allocation of Argo profiles inside detected eddies, the spatial variations of structures of eddy temperature and salinity anomalies are analyzed. The results show that eddies predominantly have subsurface (near-surface) intensified temperature and salinity anomalies south (north) of the KE jet, which is related to different background stratifications between these regions. A new method based on eddy trajectories and the inferred three-dimensional eddy structures is proposed to estimate heat and salt transports by eddy movements in a Lagrangian framework. Spatial distributions of eddy transports are presented over the vicinity of the KE for the first time. The magnitude of eddy-induced meridional heat (freshwater volume) transport is on the order of 0.01 PW (103 m3/s). The eddy heat transport divergence results in an oceanic heat loss south and heat gain north of the KE, thereby reinforcing and counteracting the oceanic heat loss from air-sea fluxes south and north of the KE jet, respectively. It also suggests a poleward heat transport across the KE jet due to eddy propagation.

Document Type: Article
Keywords: mesoscale eddies; Kuroshio Extension; heat transport; fresh water transport; three-dimensional eddy structures
Research affiliation: OceanRep > SFB 754
OceanRep > SFB 754 > A4
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2017JC013303
ISSN: 2169-9275
Projects: SFB754
Date Deposited: 09 Jan 2018 16:07
Last Modified: 01 Feb 2019 15:03
URI: http://oceanrep.geomar.de/id/eprint/41347

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