GLORIA — GEOMAR Library Ocean Research Information Access

Hits per page

hits 1 - 2 | 2 hits

Sorting

Online Resource

A model study of the vertically integrated transport variability through the Yucatan Channel : role of Loop Current evolution and flow compensation around Cuba (2009)

Lin, Yuehua

Associated volumes

add to mindlist on the mindlist

Details Availability

In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 114(2009), 2169-9291

In: volume:114

In: year:2009

In: extent:14

Description / Table of Contents: The relationship between Loop Current intrusion in the Gulf of Mexico and vertically integrated transport variations through the Yucatan Channel is examined using models and the available observations. Transport in the model is found to be a minimum when the Loop Current intrudes strongly into the Gulf of Mexico, typically just before a ring is shed, and to be a maximum during the next growth phase in association with the buildup of warm water off the northwest coast of Cuba. We argue that the transport variations are part of a "compensation effect" in which transport variations through the Yucatan Channel are at least partly compensated by flow around Cuba. Numerical experiments show that the transport variations result from the interaction between the density anomalies associated with Loop Current intrusion and the variable bottom topography. The compensation effect is also shown to operate at shorter time scales (less than 30 days) in association with wind forcing.

Type of Medium: Online Resource

Pages: 14 , graph. Darst

ISSN: 2169-9291

DOI: 10.1029/2008JC005199

Language: English

Permalink

	Location	Call Number	Limitation	Availability

Others were also interested in ...

GEOMAR CATALOGUE

Link to Library Catalog

Online Resource

A generalised Osborn-Cox relation (2009)

Eden, Carsten 1968-

Associated volumes

add to mindlist on the mindlist

Details Availability

In: Journal of fluid mechanics, Cambridge [u.a.] : Cambridge Univ. Press, 1956, 632(2009), Seite 457-474, 1469-7645

In: volume:632

In: year:2009

In: pages:457-474

Description / Table of Contents: The generalized temporal residual mean (TRM-G) framework is reviewed and illustrated using a numerical simulation of vertical shear instability. It is shown how TRM-G reveals the physically relevant amount of diapycnal eddy fluxes and implied diapycnal mixing, and how TRM-G relates to the OsbornCox relation, which is often used to obtain observational estimates of the diapycnal diffusivity. An exact expression for the diapycnal diffusivity in the TRM-G is given in the presence of molecular diffusion, based on acknowledging and summing up an entire hierarchy of eddy buoyancy moments. In this revised form of the OsbornCox relation, diapycnal diffusivity is related only to irreversible mixing of buoyancy, since all advective and molecular flux terms are converted to dissipation of variance and higher order moments. An approximate but closed analytical expression can be given for the revised OsbornCox relation with the caveat that this closed expression implies unphysical cross-boundary rotational fluxes. It is demonstrated that the original OsbornCox relation, in which advective and molecular flux terms are simply neglected, is an approximation to the full form valid to first order. In the numerical simulation the original OsbornCox relation holds to a surprisingly good approximation despite large advective fluxes of variance and large lateral inhomogeneity in the turbulent mixing.