The structure and evolution of elliptical barotropic modons

Explicit stationary solutions to the equations of vorticity conservation on the $f$- and $\beta $-planes are considered, describing barotropic dipoles (modons) with elliptical frontiers. The far field – outside the elliptical separatrix demarcating the regions of closed and open streamlines – is giv...

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Published in:Journal of fluid mechanics Vol. 530; pp. 1 - 30
Main Authors: KHVOLES, R., BERSON, D., KIZNER, Z.
Format: Journal Article
Language:English
Published: Cambridge, UK Cambridge University Press 10.05.2005
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ISSN:0022-1120, 1469-7645
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Abstract Explicit stationary solutions to the equations of vorticity conservation on the $f$- and $\beta $-planes are considered, describing barotropic dipoles (modons) with elliptical frontiers. The far field – outside the elliptical separatrix demarcating the regions of closed and open streamlines – is given analytically, whereas the interior is solved numerically using a successive linearization algorithm. Both ellipses extended along the translation axis and those extended in the transverse direction are considered. In the latter case, it is shown that, among the possible solutions, there exist the so-called supersmooth modons marked by continuity of the vorticity derivatives at the separatrix. On the $\beta$-plane, the separatrix aspect ratio that allows a supersmooth solution varies depending on the modon translation speed and size, while on the $ f$-plane, there is only one such separatrix aspect ratio. In this context, the limiting transition from the $\beta $-plane to the $f$-plane is discussed. The dependence between the absolute (or relative) vorticity $q$ and the ‘co-moving’ streamfunction $\Psi $, which is nonlinear in the interior of non-circular modons, is analysed in detail for both $\beta $- and $f$-planes, the main concern being the relation between the separatrix form, on the one hand, and the shape of the $q$ against $\Psi $ scattergraph on the other. The stability of elliptical dipoles versus the separatrix aspect ratio is examined based on numerical simulations of the temporal evolution of the modons found. The supersmooth modons appear to be the most stable among all the elliptical dipoles.
AbstractList Explicit stationary solutions to the equations of vorticity conservation on the f- and fi-planes are considered, describing barotropic dipoles (modons) with elliptical frontiers. The far field outside the elliptical separatrix demarcating the regions of closed and open streamlines is given analytically, whereas the interior is solved numerically using a successive linearization algorithm. Both ellipses extended along the translation axis and those extended in the transverse direction are considered. In the latter case, it is shown that, among the possible solutions, there exist the so-called supersmooth modons marked by continuity of the vorticity derivatives at the separatrix. On the beta-plane, the separatrix aspect ratio that allows a supersmooth solution varies depending on the modon translation speed and size, while on the f -plane, there is only one such separatrix aspect ratio. In this context, the limiting transition from the beta-plane to the f -plane is discussed. The dependence between the absolute (or relative) vorticity q and the 'co-moving' streamfunction W, which is nonlinear in the interior of non-circular modons, is analysed in detail for both q- and f -planes, the main concern being the relation between the separatrix form, on the one hand, and the shape of the q against W scattergraph on the other. The stability of elliptical dipoles versus the separatrix aspect ratio is examined based on numerical simulations of the temporal evolution of the modons found. The supersmooth modons appear to be the most stable among all the elliptical dipoles.
Explicit stationary solutions to the equations of vorticity conservation on the $f$- and $\beta $-planes are considered, describing barotropic dipoles (modons) with elliptical frontiers. The far field - outside the elliptical separatrix demarcating the regions of closed and open streamlines - is given analytically, whereas the interior is solved numerically using a successive linearization algorithm. Both ellipses extended along the translation axis and those extended in the transverse direction are considered. In the latter case, it is shown that, among the possible solutions, there exist the so-called supersmooth modons marked by continuity of the vorticity derivatives at the separatrix. On the $\beta$-plane, the separatrix aspect ratio that allows a supersmooth solution varies depending on the modon translation speed and size, while on the $ f$-plane, there is only one such separatrix aspect ratio. In this context, the limiting transition from the $\beta $-plane to the $f$-plane is discussed. The dependence between the absolute (or relative) vorticity $q$ and the 'co-moving' streamfunction $\Psi $, which is nonlinear in the interior of non-circular modons, is analysed in detail for both $\beta $- and $f$-planes, the main concern being the relation between the separatrix form, on the one hand, and the shape of the $q$ against $\Psi $ scattergraph on the other. The stability of elliptical dipoles versus the separatrix aspect ratio is examined based on numerical simulations of the temporal evolution of the modons found. The supersmooth modons appear to be the most stable among all the elliptical dipoles. [PUBLICATION ABSTRACT]
Explicit stationary solutions to the equations of vorticity conservation on the $f$ - and $\beta $ -planes are considered, describing barotropic dipoles (modons) with elliptical frontiers. The far field – outside the elliptical separatrix demarcating the regions of closed and open streamlines – is given analytically, whereas the interior is solved numerically using a successive linearization algorithm. Both ellipses extended along the translation axis and those extended in the transverse direction are considered. In the latter case, it is shown that, among the possible solutions, there exist the so-called supersmooth modons marked by continuity of the vorticity derivatives at the separatrix. On the $\beta$ -plane, the separatrix aspect ratio that allows a supersmooth solution varies depending on the modon translation speed and size, while on the $ f$ -plane, there is only one such separatrix aspect ratio. In this context, the limiting transition from the $\beta $ -plane to the $f$ -plane is discussed. The dependence between the absolute (or relative) vorticity $q$ and the ‘co-moving’ streamfunction $\Psi $ , which is nonlinear in the interior of non-circular modons, is analysed in detail for both $\beta $ - and $f$ -planes, the main concern being the relation between the separatrix form, on the one hand, and the shape of the $q$ against $\Psi $ scattergraph on the other. The stability of elliptical dipoles versus the separatrix aspect ratio is examined based on numerical simulations of the temporal evolution of the modons found. The supersmooth modons appear to be the most stable among all the elliptical dipoles.
Author KHVOLES, R.
BERSON, D.
KIZNER, Z.
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  fullname: KIZNER, Z.
  organization: Department of Mathematics Bar-Ilan University, Ramat-Gan 52900, Israel
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Snippet Explicit stationary solutions to the equations of vorticity conservation on the $f$- and $\beta $-planes are considered, describing barotropic dipoles (modons)...
Explicit stationary solutions to the equations of vorticity conservation on the $f$ - and $\beta $ -planes are considered, describing barotropic dipoles...
Explicit stationary solutions to the equations of vorticity conservation on the f- and fi-planes are considered, describing barotropic dipoles (modons) with...
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SubjectTerms Earth, ocean, space
Exact sciences and technology
External geophysics
Fluid mechanics
Meteorology
Other topics
Other topics in atmospheric geophysics
Physics of the oceans
Title The structure and evolution of elliptical barotropic modons
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