Pacific-to-Indian Ocean connectivity: Tasman leakage, Indonesian Throughflow, and the role of ENSO

van Sebille, Erik, Sprintall, Janet, Schwarzkopf, Franziska U., Sen Gupta, Alex, Santoso, Agus, England, Matthew H., Biastoch, Arne and Böning, Claus W. (2014) Pacific-to-Indian Ocean connectivity: Tasman leakage, Indonesian Throughflow, and the role of ENSO Journal of Geophysical Research: Oceans, 119 (2). pp. 1365-1382. DOI 10.1002/2013JC009525.

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The upper ocean circulation of the Pacific and Indian Oceans is connected through both the Indonesian Throughflow north of Australia and the Tasman leakage around its south. The relative importance of these two pathways is examined using virtual Lagrangian particles in a high-resolution nested ocean model. The unprecedented combination of a long integration time within an eddy-permitting ocean model simulation allows the first assessment of the interannual variability of these pathways in a realistic setting. The mean Indonesian Throughflow, as diagnosed by the particles, is 14.3 Sv, considerably higher than the diagnosed average Tasman leakage of 4.2 Sv. The time series of Indonesian Throughflow agrees well with the Eulerian transport through the major Indonesian Passages, validating the Lagrangian approach using transport-tagged particles. While the Indonesian Throughflow is mainly associated with upper ocean pathways, the Tasman leakage is concentrated in the 400–900 m depth range at subtropical latitudes. Over the effective period considered (1968–1994), no apparent relationship is found between the Tasman leakage and Indonesian Throughflow. However, the Indonesian Throughflow transport correlates with ENSO. During strong La Niñas, more water of Southern Hemisphere origin flows through Makassar, Moluccas, Ombai, and Timor Straits, but less through Moluccas Strait. In general, each strait responds differently to ENSO, highlighting the complex nature of the ENSO-ITF interaction.

Document Type: Article
Additional Information: WOS:000336261200042
Keywords: Indonesian Throughflow; Tasman leakage; Lagrangian modeling; interocean exchanges; ENSO
Research affiliation: OceanRep > SFB 754 > A2
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754
Refereed: Yes
DOI etc.: 10.1002/2013JC009525
ISSN: 2169-9275
Projects: SFB754, Future Ocean
Date Deposited: 26 May 2014 13:23
Last Modified: 26 Feb 2018 14:42

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