An oceanic frontal jet near the Norfolk Ridge northwest of New Zealand

Stanton, B. R.

doi:10.1016/0011-7471(76)90849-4

Cited by 11 publications

(30 citation statements)

References 13 publications

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“…In contrast, the EAC along the east coast of Australia before its separation point has never been observed to have zero or northward net transport. The mean calculated Tasman Front transport of 7.8 Sv is consistent with Stanton's [1976] result of 7.6-8.5 Sv, but is somewhat smaller than the Stanton [1981] value of 12-13 Sv. Stanton [1976] and Stanton [1981] values were both calculated from single surveys and hence fall well within the range of variability of the present study.…”

Section: Discussionsupporting

confidence: 80%

“…The mean calculated Tasman Front transport of 7.8 Sv is consistent with Stanton 's [1976] result of 7.6–8.5 Sv, but is somewhat smaller than the Stanton [] value of 12–13 Sv. Stanton [] and Stanton [] values were both calculated from single surveys and hence fall well within the range of variability of the present study. Note that although different levels of no motions were used (1000 and 1300 m, respectively), this will not change the comparison appreciably given the low flows at depth and the large variability in measured transports in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…There is very little recent work in the Tasman Front, but it was the focus of several studies through the 1970s. Stanton [1976] used relatively broadly spaced hydrological stations to study what was then called the ''Mid Tasman Convergence,'' finding peak surface speeds of 38 cm s 21 and calculating geostrophic transports of 9-12 Sv (relative to 1000 dbars). In a subsequent study, Stanton [1979] used bathythermograph data in the region of Norfolk Ridge combined with a T-S relation to calculate dynamic height relative to 1000 m and thereby geostrophic velocities.…”

Section: Introductionmentioning

confidence: 99%

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Flows in the Tasman Front south of Norfolk Island

Sutton

Bowen

2014

J. Geophys. Res. Oceans

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The Tasman Front is a narrow band of eastward flowing subtropical water crossing the Tasman Sea from Australia to North Cape, New Zealand. It is the link between the two subtropical western boundary currents of the South Pacific, the East Australian Current (EAC) off eastern Australia, and the East Auckland Current (EAUC) off northeastern New Zealand. Here we report the first direct measurements of flow in the Tasman Front from a moored array deployed across gaps in the submarine ridges south of Norfolk Island and hydrographic and ADCP measurements during the deployment and recovery voyages. The mean flow through the array over July 2003 to August 2004 was found to be eastward only in the upper 800 m with a transport of $6 Sv. Below 800 m a weak westward mean flow ($1.5 Sv) was measured, associated with Antarctic Intermediate Water (AAIW). Using sea surface height to account for additional transport south of the moored array results in a total mean eastward transport between Norfolk Island and North Cape, New Zealand of $8 Sv, varying between 24 and 18 Sv. The measurements show that the Tasman Front is much shallower than either the EAC or EAUC, both of which extend below 2000 m depth, has less transport than either the EAC or EAUC and has instances of flow reversal. Thus, the Tasman Front is a weaker connection between the EAC and EAUC than the paradigm of a contiguous South Pacific western boundary current system would suggest.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flows in the Tasman Front south of Norfolk Island

Sutton

Bowen

2014

J. Geophys. Res. Oceans

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“…It has been reported as common in east Australian coastal waters (Kott 1957) at least as far north as 29° S, while its presence at a 100 m station about 37° S off Eden, New South Wales, was taken to indicate the presence of waters of the northern coastal areas which were deflected away from the coast by northward moving southern coastal waters. Knowledge of the Tasman Sea circulation indicates that the quickest way for an organism to reach New Zealand from the Australian coast would be in the meandering zonal jet which leaves the East Australian Current at about 34° S (Stanton 1976). The likelihood that this is the method by which mixing of Australian and New Zealand populations occurs is supported by the distribution of T. turbinata in the north-west of New Zealand.…”

Section: Discussionmentioning

confidence: 74%

Distribution of the pelagic copepodtemora turbinatain New Zealand coastal waters, and possible trans‐tasman population continuity

Bradford

1977

New Zealand Journal of Marine and Freshwater Research

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The quantitative distribution of Temora turbinata in summer appears to be governed in the New Zealand region by subtropical currents and by its nutritional requirements. The existence of T. turbinata principally in coastal waters suggests that threshold nutritional conditions exist beneath which this species cannot breed. Temora turbinata apparently attains very large numbers only in enclosed or semi-enclosed bodies of water, where wholesale exchange of local water with adjacent water does not take place.

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“…This obviously leads to a degree of cancellation of the southward flow, and estimates of the net transport will vary depending on the choice of station positions. Estimates of the transport in and out of the broader southwest Pacific region have been considered by several workers [Wyrtki, 1962b;Scully-Power, 1973;Stanton, 1976;Andrews et al, 1980;Church, 1987]. These studies have certainly given us a much clearer picture of the key elements of the transport distributions, but little consideration is given to the statistical reliability of the estimates.…”

Section: Discussionmentioning

confidence: 99%

Mass and heat budgets in the East Australian current: A direct approach

Ridgway¹,

Godfrey²

1994

J. Geophys. Res.

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We present a technique which uses the large set of expendable bathythermograph data that are available in the waters off Eastern Australia to correct sampling errors in the mass transport function calculated from the much more limited number of deep hydrology stations. This technique utilizes the close correlation between temperature at a single depth and subsurface steric height, found in these waters, to perform the correction. After corrections are applied, it is found that a mass transport function for the top 2000 dbar can be used to estimate the net geostrophic outflows from the Tasman and Coral seas; it balances Ekman inflows to within −0.4±2.0 Sv (1 Sv = 1.0×106 m3 s−1). The mass transport closure allows a much improved determination of the distribution of individual transport components into the region to be obtained, including a robust estimate of the net southward transport through the whole width of the Tasman Sea (including the East Australian Current (EAC)) of 9.4 Sv, through a section at 28°S between the coast and 171°E. A more direct determination of this Tasman Sea transport, which uses annual mean alongshore currents on the shelf to infer mass transport on the slope, provides an independent confirmation. Mass budgets between density surfaces are also examined; for the deeper layers we find a closure of the mass budget within 10% of the net inflow (a maximum misclosure of 0.9 Sv), suggesting little diapycnal mixing. The geostrophic inflow upwells as it flows south in the EAC at a rate of about 3 Sv at a 250 m depth. The net transport balance along the path also allows the first determination of the heat transport associated with the mean mass transport into the Tasman and Coral seas to be obtained (we have not considered any contributions from eddy heat transport). There is a small net inflow of heat transport to the region of 0.13×1015 W, with more heat entering the Tasman Sea than the Coral Sea. The net upward heat flux of 24 W m−2 (heat loss to the atmosphere) is consistent with values given in climatologies obtained from direct surface flux calculations. The results from a Sverdrup‐Munk model agree broadly with the the observed pattern of the mass transport function, particularly the location of the boundary currents, although the model transports are generally higher.

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An oceanic frontal jet near the Norfolk Ridge northwest of New Zealand

Cited by 11 publications

References 13 publications

Flows in the Tasman Front south of Norfolk Island

Flows in the Tasman Front south of Norfolk Island

Distribution of the pelagic copepodtemora turbinatain New Zealand coastal waters, and possible trans‐tasman population continuity

Mass and heat budgets in the East Australian current: A direct approach

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