The University of Southampton
University of Southampton Institutional Repository

The Interaction of a Deep Western Boundary Current and the Wind-Driven Gyres as a Cause for Low-Frequency Variability

The Interaction of a Deep Western Boundary Current and the Wind-Driven Gyres as a Cause for Low-Frequency Variability
The Interaction of a Deep Western Boundary Current and the Wind-Driven Gyres as a Cause for Low-Frequency Variability
Recent modeling and observational studies have indicated that the interaction of the Gulf Stream and the deep western boundary current (DWBC) in the North Atlantic may induce low-frequency (decadal timescale) variability. To understand the origin of this low-frequency variability, a line of studies is continued here addressing the stability and variability of the wind-driven circulation using techniques of dynamical systems theory. In an idealized quasigeostrophic 2-layer model setup, stationary solutions of the coupled wind-driven gyres/DWBC system are computed, using the lateral friction as control parameter. Simultaneously, their stability is assessed. When a DWBC is absent, only oscillatory instabilities with intermonthly timescales are found. However, when the strength of the DWBC is increased, the coupled 2-layer flow becomes susceptible to instabilities with interannual timescales. By computing transient flows at relatively low friction, it is found that the existence of these interannual modes induces low-frequency variability in the coupled Gulf Stream/DWBC system with a preferred interannual timescale.
0022-3670
2321-2339
Katsman, Caroline A.
3b02aa84-550b-4a74-9331-28bc5e2f9601
Drijfhout, Sybren S.
a5c76079-179b-490c-93fe-fc0391aacf13
Dijkstra, Henk A.
9178b06d-9de5-4f02-b9ff-204b20620291
Katsman, Caroline A.
3b02aa84-550b-4a74-9331-28bc5e2f9601
Drijfhout, Sybren S.
a5c76079-179b-490c-93fe-fc0391aacf13
Dijkstra, Henk A.
9178b06d-9de5-4f02-b9ff-204b20620291

Katsman, Caroline A., Drijfhout, Sybren S. and Dijkstra, Henk A. (2001) The Interaction of a Deep Western Boundary Current and the Wind-Driven Gyres as a Cause for Low-Frequency Variability. Journal of Physical Oceanography, 31 (8), 2321-2339. (doi:10.1175/1520-0485(2001)031<2321:TIOADW>2.0.CO;2).

Record type: Article

Abstract

Recent modeling and observational studies have indicated that the interaction of the Gulf Stream and the deep western boundary current (DWBC) in the North Atlantic may induce low-frequency (decadal timescale) variability. To understand the origin of this low-frequency variability, a line of studies is continued here addressing the stability and variability of the wind-driven circulation using techniques of dynamical systems theory. In an idealized quasigeostrophic 2-layer model setup, stationary solutions of the coupled wind-driven gyres/DWBC system are computed, using the lateral friction as control parameter. Simultaneously, their stability is assessed. When a DWBC is absent, only oscillatory instabilities with intermonthly timescales are found. However, when the strength of the DWBC is increased, the coupled 2-layer flow becomes susceptible to instabilities with interannual timescales. By computing transient flows at relatively low friction, it is found that the existence of these interannual modes induces low-frequency variability in the coupled Gulf Stream/DWBC system with a preferred interannual timescale.

Full text not available from this repository.

More information

Published date: August 2001
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 349191
URI: https://eprints.soton.ac.uk/id/eprint/349191
ISSN: 0022-3670
PURE UUID: b9518227-c38b-4970-b9e6-7faf997d1012

Catalogue record

Date deposited: 26 Feb 2013 11:57
Last modified: 16 Jul 2019 21:42

Export record

Altmetrics

Contributors

Author: Caroline A. Katsman
Author: Henk A. Dijkstra

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×