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• W435377716 abstract "This thesis describes the variability and mean flow of the Subantarctic Front(SAF) south of Australia using time series measurements of velocity andtemperature from 1993 to 1995, and six hydrographic transects along WOCEline SR3 from Tasmania to Antarctica over the period 1991 to 1996. The SAFis the strongest jet of the Antarctic Circumpolar Current (ACC) south ofAustralia. The time series of velocity and temperature are only the third suchdataset collected in the ACC and provide insight into the dynamics of thismassive current and into the heat and momentum balances of the SouthernOcean.The SAF was found to be an energetic, meandering jet with vertically coherentfluctuations. These fluctuations varied on a timescale of 20 days, and had atypical amplitude of 30 cm/s at 1150 dbar. The analysis used a coordinateframe that rotated daily to be in alignment with the direction of flow. Thisallowed the mesoscale variability of the SAF to be isolated from variability dueto meandering of the front and proved very successful for examining eddyfluxes. Vertically averaged cross-stream eddy heat flux was 11.3 kW/m^2poleward and was significantly different from zero at the 95% confidence levelfor fluctuations with periods between 2 and 90 days. Zonally integrated, thiseddy heat flux (=0.9x10^15 W) is more than large enough to balance the heatlost south of the Polar Front and is as large as cross-SAF fluxes found in DrakePassage. Cross-stream eddy momentum fluxes were small and not significantlydifferent from zero but were tending to decelerate the mean flow. A relationshipbetween vertical motion and meander phase identified in the Gulf Stream wasfound to hold for the SAF. Eddy kinetic energy levels were similar to those inDrake Passage and southeast of New Zealand. Eddy potential energy was up toan order of magnitude larger than at the other ACC sites, most likely becausemeandering of the front is more common south of Australia. Baroclinicconversion was found to be the dominant mechanism by which eddies growsouth of Australia. The typical time for the growth of an eddy is estimated tobe 30 days, approximately half that in Drake Passage. This is consistent withobservations from satellite altimetry which indicate that eddy energy is growingrapidly downstream of the Australian measurement site, while the eddy field inDrake Passage is mature.Mean cross-stream profiles of absolute and baroclinic velocity in the SAF at fivecurrent meter levels have been obtained from two streamwise profilingtechniques using specific volume anomaly at 780 dbar as the cross-streamcoordinate. One of the techniques, using hydrographic data to estimate thebaroclinic velocity profile, is presented for the first time. The mean SAFvelocity profile is composed of one central peak, reaching 52 and 34 cm/s at420 dbar, absolute and baroclinic respectively, and several smaller peaks. TheSAF flow is coherent at all levels, reaches the sea floor, and is at least 220 kmwide. The cross-stream structure of baroclinic and absolute transport of theSAF has been characterized for the first time. The integrated mean transport isat least 116+/-10 x 10^6 m^3/s, of which approximately 14% is barotropic. Thelinear conditions for baroclinic and barotropic instability are satisfied at thearray, consistent with the eddy growth rates calculated." @default.
• W435377716 created "2016-06-24" @default.
• W435377716 creator A5024076221 @default.
• W435377716 date "2000-01-01" @default.
• W435377716 modified "2023-09-26" @default.
• W435377716 title "Mean Flow, Eddy Variability and Energetics of the Subantarctic Front South of Australia" @default.
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