Impact of the Indonesian Throughflow on Agulhas leakage
Open Access
- 5 September 2013
- journal article
- Published by Copernicus GmbH in Ocean Science
- Vol. 9 (5), 773-785
- https://doi.org/10.5194/os-9-773-2013
Abstract
Using ocean models of different complexity we show that opening the Indonesian Passage between the Pacific and the Indian oceans increases the input of Indian Ocean water into the South Atlantic via the Agulhas leakage. In a strongly eddying global ocean model this response results from an increased Agulhas Current transport and a constant proportion of Agulhas retroflection south of Africa. The leakage increases through an increased frequency of ring shedding events. In an idealized two-layer and flat-bottom eddy resolving model, the proportion of the Agulhas Current transport that retroflects is (for a wide range of wind stress forcing) not affected by an opening of the Indonesian Passage. Using a comparison with a linear model and previous work on the retroflection problem, the result is explained as a balance between two mechanisms: decrease retroflection due to large-scale momentum balance and increase due to local barotropic/baroclinic instabilities.Keywords
This publication has 35 references indexed in Scilit:
- A New Regime of the Agulhas Current Retroflection: Turbulent Choking of Indian–Atlantic leakageJournal of Physical Oceanography, 2012
- Routes of Agulhas rings in the southeastern Cape BasinDeep Sea Research Part I: Oceanographic Research Papers, 2010
- Spatio-temporal characteristics of the Agulhas Current retroflectionDeep Sea Research Part I: Oceanographic Research Papers, 2010
- Evaluating two numerical advection schemes in HYCOM for eddy-resolving modelling of the Agulhas CurrentOcean Science, 2009
- Agulhas leakage dynamics affects decadal variability in Atlantic overturning circulationNature, 2008
- Mesoscale perturbations control inter‐ocean exchange south of AfricaGeophysical Research Letters, 2008
- A New Sea Surface Temperature and Sea Ice Boundary Dataset for the Community Atmosphere ModelJournal of Climate, 2008
- An eddy resolving global 1/10° ocean simulationOcean Modelling, 2005
- Barotropic instabilities of the Agulhas Current system and their relation to ring formationJournal of Marine Research, 2001
- Implicit free‐surface method for the Bryan‐Cox‐Semtner ocean modelJournal of Geophysical Research: Oceans, 1994