An Eulerian scheme for identifying fronts and vortices in quasi-balanced flows

Author:

Bachman Scott D.1

Affiliation:

1. Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, USA

Abstract

AbstractThe identification of vortices in a fluid flow is a dynamically interesting problem that has practical applications in oceanography due to the outsized role eddies play in water mass, heat, and tracer transport. Here a new Eulerian scheme is developed to detect both vortices and strongly strained fronts, which are both ubiquitous in the world ocean. The new scheme is conceptually linked to the well-known Okubo-Weiss parameter, but is extended to quasigeostrophic flows by recognizing the strong role played by vertical shear in ocean dynamics. Adapted from the λ2-criterion for vortex identification (Jeong and Hussain 1995), the scheme considers the curvature of the pressure field as the differentiator between vortical and strained flow structures, and it is shown that its underlying geometry also exhibits characteristics of quasigeostrophic flow. The uses and skill of the scheme are demonstrated using a high-resolution regional ocean simulation, and prospects for its use with observational products are discussed.

Publisher

American Meteorological Society

Subject

Oceanography

Reference194 articles.

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. On the Vertical Structure of Oceanic Mesoscale Tracer Diffusivities;Journal of Advances in Modeling Earth Systems;2022-06

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