Seasonal overturning circulation in the Red Sea: 2. Winter circulation

Handle URI:
http://hdl.handle.net/10754/575710
Title:
Seasonal overturning circulation in the Red Sea: 2. Winter circulation
Authors:
Yao, Fengchao ( 0000-0002-8218-0150 ) ; Hoteit, Ibrahim ( 0000-0002-3751-4393 ) ; Pratt, Lawrence J.; Bower, Amy S.; Köhl, Armin; Gopalakrishnan, Ganesh; Rivas, David
Abstract:
The shallow winter overturning circulation in the Red Sea is studied using a 50 year high-resolution MITgcm (MIT general circulation model) simulation with realistic atmospheric forcing. The overturning circulation for a typical year, represented by 1980, and the climatological mean are analyzed using model output to delineate the three-dimensional structure and to investigate the underlying dynamical mechanisms. The horizontal model circulation in the winter of 1980 is dominated by energetic eddies. The climatological model mean results suggest that the surface inflow intensifies in a western boundary current in the southern Red Sea that switches to an eastern boundary current north of 24N. The overturning is accomplished through a cyclonic recirculation and a cross-basin overturning circulation in the northern Red Sea, with major sinking occurring along a narrow band of width about 20 km along the eastern boundary and weaker upwelling along the western boundary. The northward pressure gradient force, strong vertical mixing, and horizontal mixing near the boundary are the essential dynamical components in the model's winter overturning circulation. The simulated water exchange is not hydraulically controlled in the Strait of Bab el Mandeb; instead, the exchange is limited by bottom and lateral boundary friction and, to a lesser extent, by interfacial friction due to the vertical viscosity at the interface between the inflow and the outflow. Key Points Sinking occurs in a narrow boundary layer along the eastern boundary Surface western boundary current switches into an eastern boundary current Water exchange in the Strait of Bab el Mandeb is not hydraulically controlled © 2014. American Geophysical Union. All Rights Reserved.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Earth Science and Engineering Program; Environmental Science and Engineering Program; Earth Fluid Modeling and Prediction Group
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research: Oceans
Issue Date:
Apr-2014
DOI:
10.1002/2013JC009331
Type:
Article
ISSN:
21699291
Sponsors:
Partial support for this effort was provided by the Saudi Aramco Marine Environmental Research Center at KAUST. We thank three anonymous reviewers for comments and suggestions that improved the manuscript.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Environmental Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Earth Science and Engineering Program; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorYao, Fengchaoen
dc.contributor.authorHoteit, Ibrahimen
dc.contributor.authorPratt, Lawrence J.en
dc.contributor.authorBower, Amy S.en
dc.contributor.authorKöhl, Arminen
dc.contributor.authorGopalakrishnan, Ganeshen
dc.contributor.authorRivas, Daviden
dc.date.accessioned2015-08-24T08:36:20Zen
dc.date.available2015-08-24T08:36:20Zen
dc.date.issued2014-04en
dc.identifier.issn21699291en
dc.identifier.doi10.1002/2013JC009331en
dc.identifier.urihttp://hdl.handle.net/10754/575710en
dc.description.abstractThe shallow winter overturning circulation in the Red Sea is studied using a 50 year high-resolution MITgcm (MIT general circulation model) simulation with realistic atmospheric forcing. The overturning circulation for a typical year, represented by 1980, and the climatological mean are analyzed using model output to delineate the three-dimensional structure and to investigate the underlying dynamical mechanisms. The horizontal model circulation in the winter of 1980 is dominated by energetic eddies. The climatological model mean results suggest that the surface inflow intensifies in a western boundary current in the southern Red Sea that switches to an eastern boundary current north of 24N. The overturning is accomplished through a cyclonic recirculation and a cross-basin overturning circulation in the northern Red Sea, with major sinking occurring along a narrow band of width about 20 km along the eastern boundary and weaker upwelling along the western boundary. The northward pressure gradient force, strong vertical mixing, and horizontal mixing near the boundary are the essential dynamical components in the model's winter overturning circulation. The simulated water exchange is not hydraulically controlled in the Strait of Bab el Mandeb; instead, the exchange is limited by bottom and lateral boundary friction and, to a lesser extent, by interfacial friction due to the vertical viscosity at the interface between the inflow and the outflow. Key Points Sinking occurs in a narrow boundary layer along the eastern boundary Surface western boundary current switches into an eastern boundary current Water exchange in the Strait of Bab el Mandeb is not hydraulically controlled © 2014. American Geophysical Union. All Rights Reserved.en
dc.description.sponsorshipPartial support for this effort was provided by the Saudi Aramco Marine Environmental Research Center at KAUST. We thank three anonymous reviewers for comments and suggestions that improved the manuscript.en
dc.publisherWiley-Blackwellen
dc.subjectMITgcmen
dc.subjectoverturningen
dc.subjectRed Seaen
dc.titleSeasonal overturning circulation in the Red Sea: 2. Winter circulationen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentEarth Science and Engineering Programen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentEarth Fluid Modeling and Prediction Groupen
dc.identifier.journalJournal of Geophysical Research: Oceansen
dc.contributor.institutionDepartment of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United Statesen
dc.contributor.institutionInstitut für Meereskunde, Zentrum für Meeres- und Klimaforschung, Universität Hamburg, Hamburg, Germanyen
dc.contributor.institutionScripps Institution of Oceanography, San Diego, San Diego, CA, United Statesen
dc.contributor.institutionCICESE, Oceanografia Biologica Baja California, Ensenada, Mexicoen
kaust.authorYao, Fengchaoen
kaust.authorHoteit, Ibrahimen
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