Accession Number:

ADA224822

Title:

Double Diffusive Interleaving Across a Thermohaline Front

Descriptive Note:

Final rept.

Corporate Author:

LONG ISLAND UNIV SOUTHAMPTON NY

Personal Author(s):

Report Date:

1990-05-30

Pagination or Media Count:

25.0

Abstract:

A model of double diffusively driven interleaving layers across a thermohaline, barotropic front is developed. The mechanism of the interleaving was proposed by Stern 1967 for small perturbations of continuous, large scale T-S gradients in the saltfingering regime by double diffusive interleaving. The model shows that this mechanism is also effective for interleaving across an initially sharp front, after strong T-S inversions develop between intrusions, in regions in which the mean vertical gradients are in the saltfingering, diffusive, or doubly stable regimes. The vertical scale of the intrusions increases with increasing cross-frontal T-S discontinuities, and decreases with increasing mean vertical density gradients. The cross-frontal fluxes caused by the finescale interleaving can be substantial, and the vertical finescale fluxes can be up gradient. Sensitivity studies are performed to study the effects of the mean gradients, microscale flux parameters, and intrusion thickness and tilt on the interleaving T-S signature, velocity and length. jhd

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE