Prevalence of strong bottom currents in the greater Agulhas system.

Cronin, Meghan F., Tozuka, Tomoki, Biastoch, Arne , Durgadoo, Jonathan V. and Beal, Lisa M. (2013) Prevalence of strong bottom currents in the greater Agulhas system. Open Access Geophysical Research Letters, 40 (9). pp. 1772-1776. DOI 10.1002/grl.50400.

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Abstract

Deep current meter data and output from two high-resolution global ocean circulation models are used to determine the prevalence and location of strong bottom currents in the greater Agulhas Current system. The two models and current meter data are remarkably consistent, showing that benthic storms, with bottom currents greater than 0.2 m s(-1), occur throughout the Agulhas retroflection region south of Africa more than 20% of the time. Furthermore, beneath the mean Agulhas Current core and the retroflection front, bottom currents exceed 0.2 m s(-1) more than 50% of the time, while away from strong surface currents, bottom currents rarely exceed 0.2 m s(-1). Implications for sediment transport are discussed and the results are compared to atmospheric storms. Benthic storms of this strength (0.2 m s(-1)) are comparable to a 9 m s(-1) (Beaufort 5) windstorm, but scaling shows that benthic storms may be less effective at lifting and transporting sediment than dust storms.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/238512
Additional Information: WOS:000320317500020
Keywords: OCEAN CIRCULATION; GLOBAL CLIMATOLOGY; KUROSHIO EXTENSION; KINETIC-ENERGY; GULF-STREAM; VARIABILITY; DYNAMICS; ATLANTIC; MOTION; MODEL
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/grl.50400
ISSN: 0094-8276
Projects: GATEWAYS
Expeditions/Models/Experiments:
Date Deposited: 18 Jul 2013 06:45
Last Modified: 24 May 2017 11:57
URI: http://oceanrep.geomar.de/id/eprint/21602

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