The advective flux of heat by mean geostrophic motions in the Southern Ocean

Szoeke, Roland A. de; Levine, Murray D.

doi:10.1016/0198-0149(81)90048-0

Cited by 104 publications

(80 citation statements)

References 22 publications

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“…12). If we consider the ACC core as centred approximately between 458S and 608S, our estimates of meridional eddy heat transport are between Á0.37 PW and Á1.1 PW, in good agreement with Gille's estimations in the direction across the mean flow; our estimate of Á 0.4 PW at 53 8S also agrees with DeSzoeke & Levine (1981), who determined a cross-ACC transport of (0.45 PW on the basis of hydrographic measurements. Generally speaking, the distribution shown in Fig.…”

supporting

confidence: 79%

“…The value at 53 8S of (0.4 PW lies inside the previous range obtained from altimetric data by Keffer & Holloway (1988) and Stammer (1998), (0.7 PW and (0.05 PW respectively, and is very close to (0.45 PW evaluated by DeSzoeke & Levine (1981) on the basis of hydrographic data.…”

Section: Discussionsupporting

confidence: 54%

“…Further estimates from hydrographic data led to a value of (0.45 PW (DeSzoeke & Levine 1981), whereas values spanning between Á0.7 PW (Keffer & Holloway 1988) and (0.05 PW (Stammer 1998) were derived from altimetric measurements; a recent work by Gille (2003) on the basis of autonomous Lagrangian circulation explorer (ALACE) float data indicates a range between (0.390.1 and (0.690.3 PW.…”

Section: Introductionmentioning

confidence: 99%

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Near-surface eddy dynamics in the Southern Ocean

2011

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The Antarctic Circumpolar Current (ACC) is a crucial component of the global ocean conveyor belt, acting as a zonal link among the major ocean basins but, to some extent, limiting meridional exchange and tending to isolate the ocean south of it from momentum and heat income. In this work we investigate one of the most important mechanisms contributing to the poleward transfer of properties in the Southern Ocean, that is the eddy component of the dynamics. For this particular purpose, observations obtained from near-surface drifters have been used: they represent a very useful data set to analyse the eddy field because of their ability to catch a large number of scales of motion while providing a quasi-synoptic coverage of the investigated area. Estimates of the eddy heat and momentum fluxes are carried out using data taken from the Global Drifter Program databank; they refer to Surface Velocity Program drifter trajectories collected in the area south of 35°S between 1995 and 2006. Eddy kinetic energies, variance ellipses, momentum and heat fluxes have been calculated using the pseudo-Eulerian method, showing patterns in good agreement with those present in the literature based on observational and model data, although there are some quantitative differences. The eddy fluxes have been separated into their rotational and divergent portions, the latter being responsible for the meridional transports. The associated zonal and depth-exponentially integrated meridional heat transport exhibits values spanning over a range between -0.4 PW and -1.1 PW in the ACC region, consistent with previous estimate

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supporting

confidence: 79%

Section: Discussionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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Near-surface eddy dynamics in the Southern Ocean

2011

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“…The eddy activities play an important role in the transport and exchange of mass, heat, and momentum. The eddies transport heat polewards to balance the heat loss in the higher polar regimes (de Szoeke and Levine, 1981) and concentrates momentum to the mean flow (Morrow et al, 1994). The Subantarctic Front (SAF) is one of the major fronts of the ACC system.…”

Section: Introductionmentioning

confidence: 99%

Observations of small-scale disturbances of the Subantarctic Front south of Australia

Aoki

Akitomo

2007

Deep Sea Research Part I: Oceanographic Research Papers

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Abstract.High-resolution XCTD and XBT observations were conducted to study eddy features were detected in the SAF for all high-resolution sections. Fluctuation of the 7• C isotherm was clearly revealed at a depth of 300-600 m for the σ θ = 26.8-26.9 kg·m −3 density range. Temperature and salinity inversions of a similar spatial scale were also found on the same density surface.The spatial scale and depth range of the small-scale anomalies could be consistent with those of the baroclinic instability in the top several hundred-meter layer. In the potential temperature-salinity (θ-S) diagram, the small-scale fluctuations constitute cold/fresh intrusions from the warm/saline SAMW curve. The intrusions were found on the θ-S line connecting the deeper SAMW and the shallower Antarctic Surface Water (AASW) of the higher latitudes.From the WOCE observations, the presence of SAMW with high DO was indicated north of the SAF, as previously reported. Within the SAF, intrusions in the θ-S diagram with relatively high DO were found at around the 7• C isotherm for 26.8-26.9 kg·m −3 , the same densities for the small-scale anomalies and the high-DO SAMW. Analysis of heat and salt deficit suggests that the small-scale disturbances have a comparable or larger role than those of meso-scale anomalies. These imply that the small-scale anomalies contribute to the cross-frontal water exchange and to the formation of high-DO SAMW.

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“…Poleward eddy heat transports in the ACC in FRAM have been compared with those inferred by De Szoeke and Levine (1981), who used a novel technique to estimate heat transport due to mean geostrophic motions from climatalogical hydrographic and wind stress data . Thompson (1993) found that the eddies in FRAM advect only 0.12 PW poleward across the ACC, compared to the previous authors' estimate of 0 .45 ± 0 .30 PW .…”

Section: Transient Motionmentioning

confidence: 99%