Modeling the inertial recirculation of a gyre

Richard J. Greatbatch, David M. Holland

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

182A common feature of the “time-mean” flow in eddy-resolving models of the large-scale ocean circulation is the so-called “inertial recirculation” region. This region, found in the northwestern corner of the subtropical gyre (northern hemisphere), is usually associated with flow extending throughout the depth of the model ocean, a baroclinic eastward jet extending out from the western boundary into the ocean interior (corresponding to the Gulf Stream) and a much more barotropic westward recirculation. In this article, we begin by reviewing ideas concerning the physical nature of inertial recirculation and its connection with western boundary current transport. A potential vorticity-conserving model is then described. New work is presented in which the governing equations are solved numerically. The method of solution involves separating the equations into a set of vertical eigenmodes and solving the horizontal structure problem associated with each mode. The eigenmodes, which form a complete set, arise naturally from the governing equations and enable simple interpretations of the solutions to be given. The solutions exhibit a baroclinic eastward jet and a much more barotropic westward recirculation like that found in the eddy-resolving models and observed in the Gulf Stream system. It is shown that the vertical shear of the westward recirculation depends on the importance of the relative vorticity in its potential vorticity budget, the shear being greatest when its relative vorticity can be neglected.

Original languageEnglish (US)
Title of host publicationModeling Marine Systems
Subtitle of host publicationVolume II
PublisherCRC Press
Pages181-212
Number of pages32
ISBN (Electronic)9781351083157
ISBN (Print)0849342228, 9781315895604
DOIs
StatePublished - Jan 1 2018

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

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    Greatbatch, R. J., & Holland, D. M. (2018). Modeling the inertial recirculation of a gyre. In Modeling Marine Systems: Volume II (pp. 181-212). CRC Press. https://doi.org/10.1201/9781351074704