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Poleward shift of the Pacific North Equatorial Current bifurcation

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doi: 10.1029/2019JC015019
Authors:Guo Haihong; Chen Zhaohui; Yang Haiyuan
Author Affiliations:Primary:
Ocean University of China, Physical Oceanography Laboratory/Institute for Advanced Ocean Study, Qingdao, Qingdao, China
Volume Title:Journal of Geophysical Research: Oceans
Source:Journal of Geophysical Research: Oceans, 124(7), p.4557-4571. Publisher: Wiley-Blackwell for American Geophysical Union, Washington, DC, United States. ISSN: 2169-9275
Publication Date:2019
Note:In English. Includes appendices. 43 refs.; illus., incl. 2 tables
Summary:The dynamics of the poleward shift of the Pacific North Equatorial Current bifurcation latitude (NBL) is studied using a 5.5-layer reduced gravity model. It is found that the poleward shift of the NBL is associated with the asymmetric intensity of the wind stress curl input to the Pacific tropical and subtropical gyres. Stronger wind stress curl in the subtropical gyre leads to equatorward transport in the interior upper ocean across the boundary between the two gyres, causing a poleward transport compensation at the western boundary. In the lower layer ocean, in turn, there is poleward (equatorward) transport at the interior (western boundary) due to Sverdrup balance which requires zero transport at the gyre boundary where zonally integrated wind stress curl is zero. Therefore, the NBL exhibits a titling feature, with its position being more equatorward in the upper layer and more poleward in the lower layer. The equatorial currents bifurcations in other basins are also characterized by the poleward titling vertical structure. The wind stress curl over the subtropical gyre is generally stronger than that over the tropical gyre, resulting in the bifurcations shifting poleward with increasing depth. Abstract Copyright (2019), . The Authors.
Subjects:Currents; Digital simulation; Mathematical models; Numerical models; Ocean currents; Sea water; Winds; Equatorial Pacific; Pacific Ocean; Pacific North Equatorial Current; Wind stress
Coordinates:S200000 N300000 W0800000 E1000000
Record ID:860256-13
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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