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A search for the Tasman Front

Citation

Oke, PR and Pilo, GS and Ridgway, K and Kiss, A and Rykova, T, A search for the Tasman Front, Journal of Marine Systems, 199 Article 103217. ISSN 0924-7963 (2019) [Refereed Article]

Copyright Statement

© 2019 Elsevier B.V.

DOI: doi:10.1016/j.jmarsys.2019.103217

Abstract

The traditional view of the circulation in the Tasman Sea includes a coherent, quasi-zonal, eastward flow towards the northern tip of New Zealand that is widely referred to as the Tasman Front. This flow was first suggested in the 1960s by oceanographers reasoning that the source of volume transport "feeding" the East Auckland Current, around northern New Zealand and extending down the east coast, must be off eastern Australia. The first reported in situ measurements of the Tasman Front included hand-drawn temperature sections that highlighted features that are not supported by observations. Here, we objectively map the original data, showing that the published reports of strong, sub-surface, north-south temperature gradients were unjustified. In the absence of additional observations, we canít be sure of the context of those original measurements - so we have objectively "searched" fields in a recent 25-year ocean reanalysis to identify scenarios that are consistent with the observations. We suggest that the most likely interpretation of the original data, is that they measured an eddy field - or a series of discontinuous streams across the central Tasman Sea. We also analyse data from surface drifting buoys to show that water traversing the Tasman Sea may take several different paths. We conclude that a continuous, zonal, eastward flow across the Tasman Sea is less common than widely-accepted conceptual models imply. Instead, we suggest that the eastward flow between Australia and northern New Zealand is perhaps better described as an "eastern extension of the EAC" - since this doesnít imply the presence of a front, and doesnít preclude a broad flow. For clarity, we also suggest that the southern branch of the EAC, known as the EAC extension, should be referred to as the "southern extension of the EAC".

Item Details

Item Type:Refereed Article
Keywords:Tasman Sea, East Australian Current, East Australian Current Eastern Extension, Tasman Front
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Pilo, GS (Miss Gabriela Semolini Pilo)
ID Code:134220
Year Published:2019
Web of Science® Times Cited:10
Deposited By:Oceans and Cryosphere
Deposited On:2019-08-01
Last Modified:2020-07-17
Downloads:0

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