Accession Number:

ADA167998

Title:

The Collision between the Gulf Stream and Warm-Core Rings,

Descriptive Note:

Corporate Author:

FLORIDA STATE UNIV TALLAHASSEE DEPT OF OCEANOGRAPHY

Personal Author(s):

Report Date:

1986-01-01

Pagination or Media Count:

20.0

Abstract:

A non-linear two-layer model with one active layer and one stagnant layer is used to explain features frequently observed during ring-Gulf Stream interaction. Attention is focused on the narrow bands about 10 to 15 km of Gulf Stream water which frequently envelop the colliding ring. The Gulf Stream is represented by an upper layer with a surfacing interface front on the north side, and the colliding ring is represented by a solid cylinder. Conceptually, the following steps are viewed as possible analogues to the actual ring-Stream interaction. Initially, the cylinder ring drifts toward the Stream in the Slope Water. Subsequently, it is pushed slightly into the frontal region and is then fixed. The resulting events that occur in the vicinity of the cylinder are examined and analytical solutions are constructed using power series expansions and integrated equations. It is found that even the slightest penetration of the cylinder into the Gulf Stream frontal region causes an intrusion of Gulf Stream water along the cylinder. Namely, as the cylinder is pushed into the Stream, a band of Gulf Stream water starts flowing along the cylinder upstream side. This band continues to intrude along the cylinder perimeter in a clockwise manner until it ultimately reattaches itself to the Gulf Stream in the downstream side. A short time after reattachment, a steady state is attained namely, the cylinder is completely surrounded by Gulf Stream water and time-dependent motions cease. The detailed structure of this steady state is computed using the integrated moment of momentum.

Subject Categories:

  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE