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A Simple and Self-consistent Geostrophic-force-balance Model of the Thermohaline Circulation with Boundary Mixing : Volume 8, Issue 4 (24/08/2011)

By Callies, J.

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Book Id: WPLBN0003975467
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: A Simple and Self-consistent Geostrophic-force-balance Model of the Thermohaline Circulation with Boundary Mixing : Volume 8, Issue 4 (24/08/2011)  
Author: Callies, J.
Volume: Vol. 8, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Marotzke, J., & Callies, J. (2011). A Simple and Self-consistent Geostrophic-force-balance Model of the Thermohaline Circulation with Boundary Mixing : Volume 8, Issue 4 (24/08/2011). Retrieved from http://worldlibrary.net/


Description
Description: Ozean im Erdsystem, Max-Planck-Institut für Meteorologie, Bundesstraße 53, 20146 Hamburg, Germany. A simple model of the thermohaline circulation (THC) is formulated, with the objective to represent explicitly the geostrophic force balance of the basinwide THC. The model comprises advective-diffusive density balances in two meridional-vertical planes located at the eastern and the western walls of a hemispheric sector basin. Boundary mixing constrains vertical motion to lateral boundary layers along these walls. Interior, along-boundary, and zonally integrated meridional flows are in thermal-wind balance. Rossby waves and the absence of interior mixing render isopycnals zonally flat except near the western boundary, constraining meridional flow to the western boundary layer. The model is forced by a prescribed meridional surface density profile.

This two-plane model reproduces both steady-state density and steady-state THC structures of a primitive-equation model. The solution shows narrow deep sinking at the eastern high latitudes, distributed upwelling at both boundaries, and a western boundary current with poleward surface and equatorward deep flow. The overturning strength has a 2/3-power-law dependence on vertical diffusivity and a 1/3-power-law dependence on the imposed meridional surface density difference. Convective mixing plays an essential role in the two-plane model, ensuring that deep sinking is located at high latitudes. This role of convective mixing is consistent with that in three-dimensional models and marks a~sharp contrast with previous two-dimensional models.

Overall, the two-plane model reproduces crucial features of the THC as simulated in simple-geometry three-dimensional models. At the same time, the model self-consistently makes quantitative a conceptual picture of the three-dimensional THC that hitherto has been expressed either purely qualitatively or not self-consistently.


Summary
A simple and self-consistent geostrophic-force-balance model of the thermohaline circulation with boundary mixing

Excerpt
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