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Asymmetries in vertical vorticity and vertical velocity arising during nonlinear homogeneous spindown

Citation

Benthuysen, JA and Thomas, LN, Asymmetries in vertical vorticity and vertical velocity arising during nonlinear homogeneous spindown, Physics of Fluids, 24, (7) Article 076601. ISSN 1070-6631 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 American Institute of Physics

DOI: doi:10.1063/1.4731280

Abstract

During the spindown of a unidirectional, geostrophic current in a homogeneous fluid, asymmetry arises in the vertical velocity and vertical relative vorticity fields. A closed-form, time-dependent solution valid to order Rossby number is derived to explore these asymmetries. Momentum advection in the interior and the Ekman layer leads to competing tendencies in the vertical vorticity's evolution. In the interior, momentum advection hastens spindown in cyclonic regions. In the Ekman layer, momentum advection weakens Ekman pumping over Ekman suction and thus tends to slow the spindown of cyclonic vorticity. It is shown that the former effect dominates, and hence cyclonic vorticity decays faster than anticyclonic vorticity.

Item Details

Item Type:Refereed Article
Keywords:vortex dynamics, rotating flows, cyclones, kinematics, planetary boundary layers
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Oceanic processes (excl. in the Antarctic and Southern Ocean)
UTAS Author:Benthuysen, JA (Dr Jessica Benthuysen)
ID Code:118999
Year Published:2012
Web of Science® Times Cited:4
Deposited By:Oceans and Cryosphere
Deposited On:2017-07-25
Last Modified:2017-08-29
Downloads:109 View Download Statistics

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