<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>UTas ePrints - Mean flow, eddy variability and energetics of the Subantarctic Front south of Australia</title> <script type="text/javascript" src="http://eprints.utas.edu.au/javascript/auto.js"><!-- padder --></script> <style type="text/css" media="screen">@import url(http://eprints.utas.edu.au/style/auto.css);</style> <style type="text/css" media="print">@import url(http://eprints.utas.edu.au/style/print.css);</style> <link rel="icon" href="/images/eprints/favicon.ico" type="image/x-icon" /> <link rel="shortcut icon" href="/images/eprints/favicon.ico" type="image/x-icon" /> <link rel="Top" href="http://eprints.utas.edu.au/" /> <link rel="Search" href="http://eprints.utas.edu.au/cgi/search" /> <meta content="Phillips, Helen E." name="eprints.creators_name" /> <meta content="h.e.phillips@utas.edu.au" name="eprints.creators_id" /> <meta content="thesis" name="eprints.type" /> <meta content="2007-03-07" name="eprints.datestamp" /> <meta content="2008-01-08 15:30:00" name="eprints.lastmod" /> <meta content="show" name="eprints.metadata_visibility" /> <meta content="Mean flow, eddy variability and energetics of the Subantarctic Front south of Australia" name="eprints.title" /> <meta content="unpub" name="eprints.ispublished" /> <meta content="260403" name="eprints.subjects" /> <meta content="public" name="eprints.full_text_status" /> <meta content="Antarctic Circumpolar Current Subantarctic Front current meter velocity heat momentum flux " name="eprints.keywords" /> <meta content="This thesis describes the variability and mean flow of the Subantarctic Front (SAF) south of Australia using time series measurements of velocity and temperature from 1993 to 1995, and six hydrographic transects along WOCE line SR3 from Tasmania to Antarctica over the period 1991 to 1996. The SAF is the strongest jet of the Antarctic Circumpolar Current (ACC) south of Australia. The time series of velocity and temperature are only the third such dataset collected in the ACC and provide insight into the dynamics of this massive current and into the heat and momentum balances of the Southern Ocean. The SAF was found to be an energetic, meandering jet with vertically coherent fluctuations. These fluctuations varied on a timescale of 20 days, and had a typical amplitude of 30 cm/s at 1150 dbar. The analysis used a coordinate frame that rotated daily to be in alignment with the direction of flow. This allowed the mesoscale variability of the SAF to be isolated from variability due to meandering of the front and proved very successful for examining eddy fluxes. Vertically averaged cross-stream eddy heat flux was 11.3 kW/m^2 poleward and was significantly different from zero at the 95% confidence level for fluctuations with periods between 2 and 90 days. Zonally integrated, this eddy heat flux (=0.9x10^15 W) is more than large enough to balance the heat lost south of the Polar Front and is as large as cross-SAF fluxes found in Drake Passage. Cross-stream eddy momentum fluxes were small and not significantly different from zero but were tending to decelerate the mean flow. A relationship between vertical motion and meander phase identified in the Gulf Stream was found to hold for the SAF. Eddy kinetic energy levels were similar to those in Drake Passage and southeast of New Zealand. Eddy potential energy was up to an order of magnitude larger than at the other ACC sites, most likely because meandering of the front is more common south of Australia. Baroclinic conversion was found to be the dominant mechanism by which eddies grow south of Australia. The typical time for the growth of an eddy is estimated to be 30 days, approximately half that in Drake Passage. This is consistent with observations from satellite altimetry which indicate that eddy energy is growing rapidly downstream of the Australian measurement site, while the eddy field in Drake Passage is mature. Mean cross-stream profiles of absolute and baroclinic velocity in the SAF at five current meter levels have been obtained from two streamwise profiling techniques using specific volume anomaly at 780 dbar as the cross-stream coordinate. One of the techniques, using hydrographic data to estimate the baroclinic velocity profile, is presented for the first time. The mean SAF velocity profile is composed of one central peak, reaching 52 and 34 cm/s at 420 dbar, absolute and baroclinic respectively, and several smaller peaks. The SAF flow is coherent at all levels, reaches the sea floor, and is at least 220 km wide. The cross-stream structure of baroclinic and absolute transport of the SAF has been characterized for the first time. The integrated mean transport is at least 116+/-10 x 10^6 m^3/s, of which approximately 14% is barotropic. The linear conditions for baroclinic and barotropic instability are satisfied at the array, consistent with the eddy growth rates calculated." name="eprints.abstract" /> <meta content="2000" name="eprints.date" /> <meta content="published" name="eprints.date_type" /> <meta content="158" name="eprints.pages" /> <meta content="University of Tasmania" name="eprints.institution" /> <meta content="Institute of Antarctic and Southern Ocean Studies" name="eprints.department" /> <meta content="phd" name="eprints.thesis_type" /> <meta content="Belkin, I. M., 1990: Hydrological fronts of the Indian Subantarctic, in The Antarctic. The committee reports., vol. 29, pp. 119{128, Nauka, Moscow, in Russian with English abstract. Bindo, N. L., and J. A. Church, 1992: Warming of the water column in the southwest Pacic Ocean, Nature, 357, 59{62. Bower, A. S., and N. G. Hogg, 1996: Structure of the Gulf Stream and its recirculations at 55 W, J. Phys. Oceanogr., 26, 1002{1022. Bryden, H. L., 1979: Poleward heat ux and conversion of available potential energy in Drake Passage, J. Mar. Res., 37, 1{22. Bryden, H. L., and R. A. Heath, 1985: Energetic eddies at the northern edge of the Antarctic Circumpolar Current, Progr. Oceanogr., 14, 65{87. Bryden, H. L., 1980: Geostrophic vorticity balance in midocean, J. Geophys. Res., 85, 2825{2828. Bryden, H. L., and R. D. Pillsbury, 1977: Variability of deep ow in the Drake Passage from year-long current measurements, J. Phys. Oceanogr., 7, 803{810. Cronin, M., K. L. Tracey and D. R. Watts, 1992: Mooring motion correction of the SYNOP Central Array current meter data., GSO Tech. Rep. 92-4, University of Rhode Island, Kingston, RI, 114pp. Cronin, M., and D. R. Watts, 1996: Eddy-mean ow interaction in the Gulf Stream at 68 W. Part I: Eddy energetics, J. Phys. Oceanogr., 26, 2107{2131. Deacon, G. E. R., 1937: The hydrology of the Southern Ocean, Discovery Reports, 15, 1{124, plates I{XLIV. deSzoeke, R. A., and M. D. Levine, 1981: The advective ux of heat by mean geostrophic motions in the Southern Ocean, Deep-Sea Res., 28A, 1057{1085. Donohue, K., E. Firing and S. Chen, 2000: Absolute geostrophic velocity within the Subantarctic Front in the Pacic Ocean, J. Geophys. Res., Submitted. Fandry, C. B., 1979: Baroclinic instability of the Antarctic Circumpolar Current in Drake Passage, Ocean Modelling, 22, 8{9. Georgi, D. T., and J. M. Toole, 1982: The Antarctic Circumpolar Current and the oceanic heat and freshwater budgets, J. Mar. Res., 40, Suppl., 183{197. Gill, A. E., 1968: A linear model of the Antarctic Circumpolar Current, J. Fluid Mech., 32, 465{488. Gill, A. E., J. S. Green and A. J. Simmons, 1974: Energy partition in the large-scale ocean circulation and the production of mid-ocean eddies, Deep-Sea Res., 21, 449{528. Gill, A. E., 1982: Atmosphere-Ocean Dynamics, Academic Press, First edition, 662pp. Gille, S. T., 1997: The Southern Ocean momentum balance: evidence for topographic eects from numerical model output and altimeter data, J. Phys. Oceanogr., 27, 2219{2232. Hall, M. M., 1986: Horizontal and vertical structure of the Gulf Stream velocity eld at 68 W, J. Phys. Oceanogr., 16, 1814{1828. Hall, M. M., 1989: Velocity and transport structure of the Kuroshio Extension at 35 N 152 E, J. Geophys. Res., 94(C10), 14445{14459. Hall, M. M., 1991: Energetics of the Kuroshio Extension at 35 N, 152 E, J. Phys. Oceanogr., 21, 958{975. Hall, M. M., and H. L. Bryden, 1985: Proling the Gulf Stream with a current meter mooring, Geophys. Res. Lett., 12(4), 203{206. Hogg, N. G., 1986: On the correction of temperature and velocity time series for mooring motion, J. Atmos. Ocean. Technol., 3, 204{214. Hogg, N. G., 1991: Mooring motion corrections revisited, J. Atmos. Ocean. Technol., 8, 289{295. Hogg, N. G., 1992: On the Gulf Stream transport between Cape Hatteras and the Grand Banks, Deep-Sea Res., 39(7/8), 1231{1246. Holton, J. R., 1992: An Introduction to Dynamic Meteorology, Academic Press, Third edition, 511pp. Inoue, M., 1985: Modal decomposition of the low-frequency currents and baroclinic instability at Drake Passage, J. Phys. Oceanogr., 15, 1157{1181. Jacobs, S. S., and D. T. Georgi, 1977: Observations on the southwest Indian/Antarctic Ocean, in A Voyage of Discovery, edited by M. Angel, pp. 43{84, Pergamon Press. Johns, W. E., T. J. Shay, J. M. Bane and D. R. Watts, 1995: Gulf Stream structure, transport and recirculation near 68 W, J. Geophys. Res., 100(C1), 817{838. Johnson, G. C., and H. L. Bryden, 1989: On the size of the Antarctic Circumpolar Current, Deep-Sea Res., 36, 35{53. Johnson, G. C., and A. H. Orsi, 1997: Southwest Pacic Ocean water-mass changes between 1968/69 and 1990/91, J. Climate, 10, 306{316. Le Traon, P. Y., F. Nadal and N. Ducet, 1998: An improved mapping method of multi-satellite altimeter data, J. Atmos. Ocean. Technol., 25, 522{534. Lindstrom, S. S., X. Qian and D. R. Watts, 1997: Vertical motion in the Gulf Stream and its relation to meanders, J. Geophys. Res., 102, 8485{8503. Lindstrom, S. S., and D. R. Watts, 1994: Vertical motion in the Gulf Stream near 68 W, J. Phys. Oceanogr., 24, 2321{2333. Marshall, J., and G. Shutts, 1981: A note on rotational and divergent eddy uxes, J. Phys. Oceanogr., 11, 1677{1680. McCartney, M. S., 1976: The interaction of zonal currents with topography with applications to the Southern Ocean, Deep-Sea Res., 23, 413{427. McWilliams, J. C., W. R. Holland and J. H. S. Chow, 1978: A description of numerical Antarctic Circumpolar Currents, Dyn. Atmos. Oceans, 2, 213{291. Morrow, R., R. Coleman, J. Church and D. Chelton, 1994: Surface eddy momentum ux and velocity variances in the Southern Ocean from Geosat altimetry, J. Phys. Oceanogr., 24, 2050{2071. Munk, W. H., and E. Palmen, 1951: Note on the dynamics of the Antarctic Circumpolar Current, Tellus, 3, 53{55. Nowlin, Jr., W. D., and M. Cliord, 1982: The kinematic and thermohaline zonation of the Antarctic Circumpolar Current at Drake Passage, J. Mar. Res., 40, Suppl., 481{507. Nowlin, Jr., W. D., and J. M. Klinck, 1986: The physics of the Antarctic Circumpolar Current, Rev. of Geophys., 24, 469{491. Nowlin, Jr., W. D., T. Whitworth, III and R. D. Pillsbury, 1977: Structure and transport of the Antarctic Circumpolar Current at Drake Passage from short-term measurements, J. Phys. Oceanogr., 7, 788{802. Nowlin, Jr., W. D., S. J. Worley and T. Whitworth, III, 1985: Methods for making point estimates of eddy heat ux as applied to the Antarctic Circumpolar Current, J. Geophys. Res., 90, 3305{3324. Olbers, D., V. Gouretski, G. Sei and J. Schroter, 1992: Hydrographic atlas of the Southern Ocean, Alfred Wegener Institute, Bremerhaven, 17pp.+82 plates. Orsi, A. H., T. Whitworth, III and W. D. Nowlin, Jr., 1995: On the meridional extent and fronts of the Antarctic Circumpolar Current, Deep-Sea Res., 42(5), 641{673. Pedlosky, J., 1987: Geophysical Fluid Dynamics, Springer-Verlag, Second edition, 710pp. Peterson, R. G., W. D. Nowlin, Jr. and T. Whitworth, III, 1982: Generation and evolution of a cyclonic ring at Drake Passage in early 1979, J. Phys. Oceanogr., 12, 712{719. Pillsbury, R. D., T. Whitworth, III, W. D. Nowlin, Jr. and F. Sciremammano, Jr., 1979: Currents and temperatures as observed in Drake Passage during 1975, J. Phys. Oceanogr., 9, 469{482. Read, J. F., and R. T. Pollard, 1993: Structure and transport of the Antarctic Circumpolar Current and Agulhas Return Current at 40E, J. Geophys. Res., 98(C7), 12,281{12,295. Rintoul, S. R., 1998: On the origin and inuence of Adelie Land Bottom Water, in Ocean, Ice and Atmosphere: Interactions at Antarctic Continental Margin, vol. 75 of Antarctic Research Series, edited by S. S. Jacobs, and R. Weiss, pp. 151{171, American Geophysical Union. Rintoul, S. R., and J. L. Bullister, 1999: A late winter hydrographic section from Tasmania to Antarctica, Deep-Sea Res., 46, 1417{1454. Rintoul, S. R., J. R. Donguy and D. H. Roemmich, 1997: Seasonal evolution of upper ocean thermal structure between Tasmania and Antarctica, Deep-Sea Res., 44, 1185{1202. Rintoul, S. R., C. Hughes and D. Olbers, 2000a: The Antarctic Circumpolar System, in Oceans and Climate, edited by G. Siedler, J. Church, and J. Gould, Academic Press, In press. Rintoul, S. R., and S. Sokolov, 2000: Baroclinic transport variability of the Antarctic Circumpolar Current south of Australia (WOCE repeat section SR3), J. Geophys. Res., In press. Rintoul, S. R., S. Sokolov and J. A. Church, 2000b: A six year record of baroclinic transport variability of the Antarctic Circumpolar Current at 140E, derived from XBT and altimeter measurements, J. Geophys. Res., Submitted. Rosenberg, M., S. Bray, N. Bindo, S. Rintoul, N. Johnson, S. Bell and P. Towler, 1997: Aurora Australis marine science cruise AU9501, AU9604, and AU9601 - Oceanographic eld measurements and analysis, inter-cruise comparisons and data quality notes, Research Report 12, Antarctic Cooperative Research Centre, Hobart, Australia. Rosenberg, M., R. Eriksen, S. Bell, N. Bindo and S. Rintoul, 1995a: Aurora Australis marine science cruise AU9407 - Oceanographic eld measurements and analysis, Research Report 6, Antarctic Cooperative Research Centre, Hobart, Australia, 97 pp. Rosenberg, M., R. Eriksen, S. Bell and S. Rintoul, 1996: Aurora Australis marine science cruise AU9404 - Oceanographic eld measurements and analysis, Research Report 8, Antarctic Cooperative Research Centre, Hobart, Australia, 53 pp. Rosenberg, M., R. Eriksen and S. Rintoul, 1995b: Aurora Australis marine science cruise AU9309/AU9391 - Oceanographic eld measurements and analysis, Research Report 2, Antarctic Cooperative Research Centre, Hobart, Australia, 103 pp. Schmitz, Jr., W. J., 1996: On the eddy eld in the Agulhas Retroection, with some global considerations, J. Geophys. Res., 101, 16,259{16,271. Sciremammano, Jr., F., 1980: The nature of the poleward heat ux due to low-frequency current uctuations in Drake Passage, J. Phys. Oceanogr., 10, 843{852. Smith, W. H. F., and D. T. Sandwell, 1994: Bathymetric prediction from dense satellite altimetry and sparse shipboard bathymetry, J. Geophys. Res., 99, 21803{21824. Speer, K., S. Rintoul and B. Sloyan, 1999: The diabatic Deacon cell, J. Phys. Oceanogr., Submitted. Stevens, D. P., and V. O. Ivchenko, 1997: The zonal momentum balance in an eddy-resolving general-circulation model of the Southern Ocean, Quart. J. Roy. Meteor. Soc., 123, 929{951. Thompson, R. O. R. Y., 1983: Low-pass lters to suppress inertial and tidal frequencies, J. Phys. Oceanogr., 13, 1077{1083. Treguier, A. M., and J. C. McWilliams, 1990: Topographic inuences on wind-driven, stratied ow in a -plane channel: An idealized model for the Antarctic Circumpolar Current, J. Phys. Oceanogr., 20, 321{343. Whitworth, III, T., 1983: Monitoring the transport of the Antarctic Circumpolar Current at Drake Passage, J. Phys. Oceanogr., 13, 2045{2057. Whitworth, III, T., W. D. Nowlin, Jr. and S. J. Worley, 1982: The net transport of the Antarctic Circumpolar Current through Drake Passage, J. Phys. Oceanogr., 12, 960{971. Whitworth, III, T., and R. G. Peterson, 1985: Volume transport of the Antarctic Circumpolar Current from bottom pressure measurements, J. Phys. Oceanogr., 15, 810{816. Wilkin, J. L., and R. A. Morrow, 1994: Eddy kinetic energy and momentum ux in the Southern Ocean: Comparison of a global eddy-resolving model with altimeter, drifter and current-meter data, J. Geophys. Res., 99(C4), 7903{7916. Wol, J. O., E. Maier-Reimer and D. J. Olbers, 1991: Wind-driven ow over topography in a zonal -plane channel: A quasi-geostrophic model of the Antarctic Circumpolar Current, J. Phys. Oceanogr., 21, 236{264. Wong, A. P. S., N. L. Bindo and J. A. Church, 1999: Large-scale freshening of intermediate waters in the Pacic and Indian oceans, Nature, 400, 440{443. Wright, D. G., 1981: Baroclinic instability in Drake Passage, J. Phys. Oceanogr., 11, 231{246. Yaremchuk, M., N. L. Bindo, J. Schroter, D. Nechaev and S. R. Rintoul, 2000: On the zonal and meridional circulation and ocean transports between Tasmania and Antarctica, J. Geophys. Res., Submitted." name="eprints.referencetext" /> <meta content="Phillips, Helen E. (2000) Mean flow, eddy variability and energetics of the Subantarctic Front south of Australia. PhD thesis, University of Tasmania." name="eprints.citation" /> <meta content="http://eprints.utas.edu.au/814/1/front_thesis.pdf" name="eprints.document_url" /> <meta content="http://eprints.utas.edu.au/814/2/thesis.pdf" name="eprints.document_url" /> <meta content="http://eprints.utas.edu.au/814/3/thesis_fig1p1.pdf" name="eprints.document_url" /> <meta content="http://eprints.utas.edu.au/814/4/thesis_fig1p2.pdf" name="eprints.document_url" /> <meta content="http://eprints.utas.edu.au/814/5/thesis_fig1p3.pdf" name="eprints.document_url" /> <meta content="http://eprints.utas.edu.au/814/6/thesis_fig2p2.pdf" name="eprints.document_url" /> <meta content="http://eprints.utas.edu.au/814/7/thesis_fig2p4.pdf" name="eprints.document_url" /> <link rel="schema.DC" href="http://purl.org/DC/elements/1.0/" /> <meta content="Mean flow, eddy variability and energetics of the Subantarctic Front south of Australia" name="DC.title" /> <meta content="Phillips, Helen E." name="DC.creator" /> <meta content="260403 Physical Oceanography" name="DC.subject" /> <meta content="This thesis describes the variability and mean flow of the Subantarctic Front (SAF) south of Australia using time series measurements of velocity and temperature from 1993 to 1995, and six hydrographic transects along WOCE line SR3 from Tasmania to Antarctica over the period 1991 to 1996. The SAF is the strongest jet of the Antarctic Circumpolar Current (ACC) south of Australia. The time series of velocity and temperature are only the third such dataset collected in the ACC and provide insight into the dynamics of this massive current and into the heat and momentum balances of the Southern Ocean. The SAF was found to be an energetic, meandering jet with vertically coherent fluctuations. These fluctuations varied on a timescale of 20 days, and had a typical amplitude of 30 cm/s at 1150 dbar. The analysis used a coordinate frame that rotated daily to be in alignment with the direction of flow. This allowed the mesoscale variability of the SAF to be isolated from variability due to meandering of the front and proved very successful for examining eddy fluxes. Vertically averaged cross-stream eddy heat flux was 11.3 kW/m^2 poleward and was significantly different from zero at the 95% confidence level for fluctuations with periods between 2 and 90 days. Zonally integrated, this eddy heat flux (=0.9x10^15 W) is more than large enough to balance the heat lost south of the Polar Front and is as large as cross-SAF fluxes found in Drake Passage. Cross-stream eddy momentum fluxes were small and not significantly different from zero but were tending to decelerate the mean flow. A relationship between vertical motion and meander phase identified in the Gulf Stream was found to hold for the SAF. Eddy kinetic energy levels were similar to those in Drake Passage and southeast of New Zealand. Eddy potential energy was up to an order of magnitude larger than at the other ACC sites, most likely because meandering of the front is more common south of Australia. Baroclinic conversion was found to be the dominant mechanism by which eddies grow south of Australia. The typical time for the growth of an eddy is estimated to be 30 days, approximately half that in Drake Passage. This is consistent with observations from satellite altimetry which indicate that eddy energy is growing rapidly downstream of the Australian measurement site, while the eddy field in Drake Passage is mature. Mean cross-stream profiles of absolute and baroclinic velocity in the SAF at five current meter levels have been obtained from two streamwise profiling techniques using specific volume anomaly at 780 dbar as the cross-stream coordinate. One of the techniques, using hydrographic data to estimate the baroclinic velocity profile, is presented for the first time. The mean SAF velocity profile is composed of one central peak, reaching 52 and 34 cm/s at 420 dbar, absolute and baroclinic respectively, and several smaller peaks. The SAF flow is coherent at all levels, reaches the sea floor, and is at least 220 km wide. The cross-stream structure of baroclinic and absolute transport of the SAF has been characterized for the first time. The integrated mean transport is at least 116+/-10 x 10^6 m^3/s, of which approximately 14% is barotropic. The linear conditions for baroclinic and barotropic instability are satisfied at the array, consistent with the eddy growth rates calculated." name="DC.description" /> <meta content="2000" name="DC.date" /> <meta content="Thesis" name="DC.type" /> <meta content="NonPeerReviewed" name="DC.type" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/814/1/front_thesis.pdf" name="DC.identifier" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/814/2/thesis.pdf" name="DC.identifier" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/814/3/thesis_fig1p1.pdf" name="DC.identifier" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/814/4/thesis_fig1p2.pdf" name="DC.identifier" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/814/5/thesis_fig1p3.pdf" name="DC.identifier" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/814/6/thesis_fig2p2.pdf" name="DC.identifier" /> <meta content="application/pdf" name="DC.format" /> <meta content="http://eprints.utas.edu.au/814/7/thesis_fig2p4.pdf" name="DC.identifier" /> <meta content="Phillips, Helen E. 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border: solid 1px #ccc; padding: 3px"><tr> <td align="left"><a href="http://eprints.utas.edu.au/cgi/users/home">Login</a> | <a href="http://eprints.utas.edu.au/cgi/register">Create Account</a></td> <td align="right" style="white-space: nowrap"> <form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/search" style="display:inline"> <input class="ep_tm_searchbarbox" size="20" type="text" name="q" /> <input class="ep_tm_searchbarbutton" value="Search" type="submit" name="_action_search" /> <input type="hidden" name="_order" value="bytitle" /> <input type="hidden" name="basic_srchtype" value="ALL" /> <input type="hidden" name="_satisfyall" value="ALL" /> </form> </td> </tr></table></td></tr> <tr> <td class="toplinks"><!-- InstanceBeginEditable name="content" --> <div align="center"> <table width="720" class="ep_tm_main"><tr><td align="left"> <h1 class="ep_tm_pagetitle">Mean flow, eddy variability and energetics of the Subantarctic Front south of Australia</h1> <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Phillips, Helen E.</span> (2000) <xhtml:em>Mean flow, eddy variability and energetics of the Subantarctic Front south of Australia.</xhtml:em> PhD thesis, University of Tasmania.</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_810' );" href="http://eprints.utas.edu.au/814/1/front_thesis.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_810' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_810"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/814/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a 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class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">This thesis describes the variability and mean flow of the Subantarctic Front (SAF) south of Australia using time series measurements of velocity and temperature from 1993 to 1995, and six hydrographic transects along WOCE line SR3 from Tasmania to Antarctica over the period 1991 to 1996. The SAF is the strongest jet of the Antarctic Circumpolar Current (ACC) south of Australia. The time series of velocity and temperature are only the third such dataset collected in the ACC and provide insight into the dynamics of this massive current and into the heat and momentum balances of the Southern Ocean. The SAF was found to be an energetic, meandering jet with vertically coherent fluctuations. These fluctuations varied on a timescale of 20 days, and had a typical amplitude of 30 cm/s at 1150 dbar. The analysis used a coordinate frame that rotated daily to be in alignment with the direction of flow. This allowed the mesoscale variability of the SAF to be isolated from variability due to meandering of the front and proved very successful for examining eddy fluxes. Vertically averaged cross-stream eddy heat flux was 11.3 kW/m^2 poleward and was significantly different from zero at the 95% confidence level for fluctuations with periods between 2 and 90 days. Zonally integrated, this eddy heat flux (=0.9x10^15 W) is more than large enough to balance the heat lost south of the Polar Front and is as large as cross-SAF fluxes found in Drake Passage. Cross-stream eddy momentum fluxes were small and not significantly different from zero but were tending to decelerate the mean flow. A relationship between vertical motion and meander phase identified in the Gulf Stream was found to hold for the SAF. Eddy kinetic energy levels were similar to those in Drake Passage and southeast of New Zealand. Eddy potential energy was up to an order of magnitude larger than at the other ACC sites, most likely because meandering of the front is more common south of Australia. Baroclinic conversion was found to be the dominant mechanism by which eddies grow south of Australia. The typical time for the growth of an eddy is estimated to be 30 days, approximately half that in Drake Passage. This is consistent with observations from satellite altimetry which indicate that eddy energy is growing rapidly downstream of the Australian measurement site, while the eddy field in Drake Passage is mature. Mean cross-stream profiles of absolute and baroclinic velocity in the SAF at five current meter levels have been obtained from two streamwise profiling techniques using specific volume anomaly at 780 dbar as the cross-stream coordinate. One of the techniques, using hydrographic data to estimate the baroclinic velocity profile, is presented for the first time. The mean SAF velocity profile is composed of one central peak, reaching 52 and 34 cm/s at 420 dbar, absolute and baroclinic respectively, and several smaller peaks. The SAF flow is coherent at all levels, reaches the sea floor, and is at least 220 km wide. The cross-stream structure of baroclinic and absolute transport of the SAF has been characterized for the first time. The integrated mean transport is at least 116+/-10 x 10^6 m^3/s, of which approximately 14% is barotropic. The linear conditions for baroclinic and barotropic instability are satisfied at the array, consistent with the eddy growth rates calculated.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Thesis (PhD)</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Antarctic Circumpolar Current Subantarctic Front current meter velocity heat momentum flux </td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/260403.html">260000 Earth Sciences > 260400 Oceanography > 260403 Physical Oceanography</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">814</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Helen E Phillips</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">07 Mar 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=814;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=814">item control page</a></p> </td></tr></table> </div> <!-- InstanceEndEditable --></td> </tr> <tr> <td><!-- #BeginLibraryItem "/Library/footer_eprints.lbi" --> <table width="795" border="0" align="left" cellpadding="0" class="footer"> <tr valign="top"> <td colspan="2"><div align="center"><a href="http://www.utas.edu.au">UTAS home</a> | <a href="http://www.utas.edu.au/library/">Library home</a> | <a href="/">ePrints home</a> | <a href="/contact.html">contact</a> | <a href="/information.html">about</a> | <a href="/view/">browse</a> | <a href="/perl/search/simple">search</a> | <a href="/perl/register">register</a> | <a href="/perl/users/home">user area</a> | <a href="/help/">help</a></div><br /></td> </tr> <tr><td colspan="2"><p><img src="/images/eprints/footerline.gif" width="100%" height="4" /></p></td></tr> <tr valign="top"> <td width="68%" class="footer">Authorised by the University Librarian<br /> © University of Tasmania ABN 30 764 374 782<br /> <a href="http://www.utas.edu.au/cricos/">CRICOS Provider Code 00586B</a> | <a href="http://www.utas.edu.au/copyright/copyright_disclaimers.html">Copyright & Disclaimers</a> | <a href="http://www.utas.edu.au/accessibility/index.html">Accessibility</a> | <a href="http://eprints.utas.edu.au/feedback/">Site Feedback</a> </td> <td width="32%"><div align="right"> <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><img src="http://www.utas.edu.au/shared/logos/unioftasstrip.gif" alt="University of Tasmania Home Page" width="260" height="16" border="0" align="right" /></a></p> <p align="right" class="NoPrint"><a href="http://www.utas.edu.au/"><br /> </a></p> </div></td> </tr> <tr valign="top"> <td><p> </p></td> <td><div align="right"><span class="NoPrint"><a href="http://www.eprints.org/software/"><img src="/images/eprintslogo.gif" alt="ePrints logo" width="77" height="29" border="0" align="bottom" /></a></span></div></td> </tr> </table> <!-- #EndLibraryItem --> <div align="center"></div></td> </tr> </table> </body> </html>