A monopolar vortex encounters a north-south ridge or trough

JHGM van Geffen; PA Davies

doi:10.1016/S0169-5983(99)00022-2

A monopolar vortex encounters a north-south ridge or trough

JHGM van Geffen
, PA Davies

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Results are described from a two-dimensional numerical model in which a cyclonic monopole that moves due to the ß-effect encounters a north-south oriented ridge or trough, the height and depth of which is varied. The fate of the monopole depends on its initial north-south position y₀ (or, equivalently, the value of the constant f₀ in the Coriolis parameter): the monopole can be rebounded, destroyed or trapped by the topography. Only for a narrow range of y₀-positions, depending on the height (depth) of the ridge (trough), can the monopole actually cross the topography, sometimes after being heavily deformed. it is the gradient of the topography-induced vorticity, which deforms the background potential vorticity field due to the ß-effect, that determines the fate of the monopole. This topography-induced vorticity is larger for initial positions more to the north or south, and for higher ridges and deeper troughs.

Original language	English
Pages (from-to)	157-179
Number of pages	23
Journal	Fluid Dynamics Research
Volume	26
Issue number	3
DOIs	https://doi.org/10.1016/S0169-5983(99)00022-2
Publication status	Published - Mar 2000

Keywords

Beta-plane
Motion
Eddies
Computational methods in fluid dynamics
Eddy
Vortex dynamics

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10.1016/S0169-5983(99)00022-2

Cite this

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title = "A monopolar vortex encounters a north-south ridge or trough",

abstract = "Results are described from a two-dimensional numerical model in which a cyclonic monopole that moves due to the {\ss}-effect encounters a north-south oriented ridge or trough, the height and depth of which is varied. The fate of the monopole depends on its initial north-south position y0 (or, equivalently, the value of the constant f0 in the Coriolis parameter): the monopole can be rebounded, destroyed or trapped by the topography. Only for a narrow range of y0-positions, depending on the height (depth) of the ridge (trough), can the monopole actually cross the topography, sometimes after being heavily deformed. it is the gradient of the topography-induced vorticity, which deforms the background potential vorticity field due to the {\ss}-effect, that determines the fate of the monopole. This topography-induced vorticity is larger for initial positions more to the north or south, and for higher ridges and deeper troughs.",

keywords = "Beta-plane, Motion, Eddies, Computational methods in fluid dynamics, Eddy, Vortex dynamics",

author = "\{van Geffen\}, JHGM and PA Davies",

year = "2000",

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doi = "10.1016/S0169-5983(99)00022-2",

language = "English",

volume = "26",

pages = "157--179",

journal = "Fluid Dynamics Research",

issn = "0169-5983",

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TY - JOUR

T1 - A monopolar vortex encounters a north-south ridge or trough

AU - van Geffen, JHGM

AU - Davies, PA

PY - 2000/3

Y1 - 2000/3

N2 - Results are described from a two-dimensional numerical model in which a cyclonic monopole that moves due to the ß-effect encounters a north-south oriented ridge or trough, the height and depth of which is varied. The fate of the monopole depends on its initial north-south position y0 (or, equivalently, the value of the constant f0 in the Coriolis parameter): the monopole can be rebounded, destroyed or trapped by the topography. Only for a narrow range of y0-positions, depending on the height (depth) of the ridge (trough), can the monopole actually cross the topography, sometimes after being heavily deformed. it is the gradient of the topography-induced vorticity, which deforms the background potential vorticity field due to the ß-effect, that determines the fate of the monopole. This topography-induced vorticity is larger for initial positions more to the north or south, and for higher ridges and deeper troughs.

AB - Results are described from a two-dimensional numerical model in which a cyclonic monopole that moves due to the ß-effect encounters a north-south oriented ridge or trough, the height and depth of which is varied. The fate of the monopole depends on its initial north-south position y0 (or, equivalently, the value of the constant f0 in the Coriolis parameter): the monopole can be rebounded, destroyed or trapped by the topography. Only for a narrow range of y0-positions, depending on the height (depth) of the ridge (trough), can the monopole actually cross the topography, sometimes after being heavily deformed. it is the gradient of the topography-induced vorticity, which deforms the background potential vorticity field due to the ß-effect, that determines the fate of the monopole. This topography-induced vorticity is larger for initial positions more to the north or south, and for higher ridges and deeper troughs.

KW - Beta-plane

KW - Motion

KW - Eddies

KW - Computational methods in fluid dynamics

KW - Eddy

KW - Vortex dynamics

U2 - 10.1016/S0169-5983(99)00022-2

DO - 10.1016/S0169-5983(99)00022-2

M3 - Article

SN - 0169-5983

VL - 26

SP - 157

EP - 179

JO - Fluid Dynamics Research

JF - Fluid Dynamics Research

IS - 3

ER -

A monopolar vortex encounters a north-south ridge or trough

Abstract

Keywords

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