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<meta content="Phillips, Helen E." name="eprints.creators_name" />
<meta content="Rintoul, S.R." name="eprints.creators_name" />
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<meta content="A mean synoptic view of the subantarctic front (SAF) is obtained from current meter and hydrographic data
by averaging absolute and baroclinic velocity measurements in bins defined by a cross-stream coordinate that
moves with the current. The cross-stream coordinate is derived from current meter measurements of vertical
shear of the horizontal velocity and is expressed in terms of specific volume anomaly at 780 dbar (d780). By
averaging absolute and baroclinic velocity measurements in stream coordinates, the spatial smoothing that results
from Eulerian averaging of measurements of a meandering current is avoided. The mean SAF velocity profile
is composed of one central peak and several smaller peaks. In the central peak, the 2-yr mean absolute velocity
from current meters reaches 52 cm/s at 420 dbar; the mean baroclinic velocity from six CTD sections reaches
34 cm/s. The SAF flow is coherent at all levels, reaches the seafloor, and is at least 220 km wide. The crossstream
structure of baroclinic and absolute transport of the SAF has been characterized for the first time. The
integrated mean transport is 116+/-10 (x 10^6 m3/s), of which approximately 14% is barotropic, where barotropic
transport is defined to be the velocity at the deepest current meter (3320 dbar) multiplied by the water depth.
Comparison of the current meter measurements with hydrographic sections suggest this estimate is likely a lower bound on the absolute transport, as part of the 'cold side' of the SAF is not sampled by the moored array. Linear conditions for baroclinic and barotropic instability of the mean flow are satisfied at the array, consistent with earlier work that showed baroclinic conversion is the dominant mechanism for eddy growth at the array, with weaker barotropic conversion also occurring." name="eprints.abstract" />
<meta content="2002-05" name="eprints.date" />
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<meta content="Journal of Physical Oceanography" name="eprints.publication" />
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<meta content="10.1175/1520-0485(2002)032<1536:AMSVOT>2.0.CO;2" name="eprints.id_number" />
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<meta content="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
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Donohue, K., E. Firing and S. Chen, 2001: Absolute geostrophic velocity within the
Subantarctic Front in the Pacic Ocean, J. Geophys. Res., In press.
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.
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Hall, M. M., 1986: Horizontal and vertical structure of the Gulf Stream velocity eld at 68 W,
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Hogg, N. G., 1992: On the Gulf Stream transport between Cape Hatteras and the Grand Banks,
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and recirculation near 68 W, J. Geophys. Res., 100(C1), 817-838.
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altimeter data, J. Atmos. Ocean. Technol., 25, 522-534.
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.
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.
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.
Phillips, H. E., 2000: Mean ow, eddy variability and energetics of the Subantarctic Front south
of Australia, Ph.D. thesis, IASOS University of Tasmania, Hobart, Australia, 158 pp.
Phillips, H. E., and S. R. Rintoul, 2000: Eddy variability and energetics from direct current
measurements in the Antarctic Circumpolar Current south of Australia, J. Phys. Oceanogr.,
30(12), 3050-3076.
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Currents and temperatures as observed in Drake Passage during 1975, J. Phys. Oceanogr., 9,
23
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Antarctica, Deep-Sea Res., 46, 1417-1454.
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Circumpolar Current south of Australia (WOCE repeat section SR3), J. Geophys. Res., 106,
2815-2832.
Rintoul, S. R., S. Sokolov and J. A. Church, 2000: 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.
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altimetry and sparse shipboard bathymetry, J. Geophys. Res., 99, 21803-21824.
Sokolov, S., and S. Rintoul, 2001: Structure of Southern Ocean fronts at 140E, J. Mar.
Systems, Submitted (Special issue on ocean fronts).
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.
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, 2001: On the zonal
and meridional circulation and ocean transports between Tasmania and Antarctica, J.
Geophys. Res., 106, 2795-2814, (C2).
24" name="eprints.referencetext" />
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<meta content="A mean synoptic view of the subantarctic front (SAF) is obtained from current meter and hydrographic data
by averaging absolute and baroclinic velocity measurements in bins defined by a cross-stream coordinate that
moves with the current. The cross-stream coordinate is derived from current meter measurements of vertical
shear of the horizontal velocity and is expressed in terms of specific volume anomaly at 780 dbar (d780). By
averaging absolute and baroclinic velocity measurements in stream coordinates, the spatial smoothing that results
from Eulerian averaging of measurements of a meandering current is avoided. The mean SAF velocity profile
is composed of one central peak and several smaller peaks. In the central peak, the 2-yr mean absolute velocity
from current meters reaches 52 cm/s at 420 dbar; the mean baroclinic velocity from six CTD sections reaches
34 cm/s. The SAF flow is coherent at all levels, reaches the seafloor, and is at least 220 km wide. The crossstream
structure of baroclinic and absolute transport of the SAF has been characterized for the first time. The
integrated mean transport is 116+/-10 (x 10^6 m3/s), of which approximately 14% is barotropic, where barotropic
transport is defined to be the velocity at the deepest current meter (3320 dbar) multiplied by the water depth.
Comparison of the current meter measurements with hydrographic sections suggest this estimate is likely a lower bound on the absolute transport, as part of the 'cold side' of the SAF is not sampled by the moored array. Linear conditions for baroclinic and barotropic instability of the mean flow are satisfied at the array, consistent with earlier work that showed baroclinic conversion is the dominant mechanism for eddy growth at the array, with weaker barotropic conversion also occurring." name="DC.description" />
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<h1 class="ep_tm_pagetitle">A mean synoptic view 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> and <span class="person_name">Rintoul, S.R.</span> (2002) <xhtml:em>A mean synoptic view of the Subantarctic Front south of Australia.</xhtml:em> Journal of Physical Oceanography, 32 (5). pp. 1536-1553. ISSN 1520-0485</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 href="http://eprints.utas.edu.au/809/1/A_mean_synoptic_view.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/809/1/A_mean_synoptic_view.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />1023Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="4450" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1175/1520-0485(2002)032<1536:AMSVOT>2.0.CO;2">http://dx.doi.org/10.1175/1520-0485(2002)032<1536:AMSVOT>2.0.CO;2</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">A mean synoptic view of the subantarctic front (SAF) is obtained from current meter and hydrographic data
by averaging absolute and baroclinic velocity measurements in bins defined by a cross-stream coordinate that
moves with the current. The cross-stream coordinate is derived from current meter measurements of vertical
shear of the horizontal velocity and is expressed in terms of specific volume anomaly at 780 dbar (d780). By
averaging absolute and baroclinic velocity measurements in stream coordinates, the spatial smoothing that results
from Eulerian averaging of measurements of a meandering current is avoided. The mean SAF velocity profile
is composed of one central peak and several smaller peaks. In the central peak, the 2-yr mean absolute velocity
from current meters reaches 52 cm/s at 420 dbar; the mean baroclinic velocity from six CTD sections reaches
34 cm/s. The SAF flow is coherent at all levels, reaches the seafloor, and is at least 220 km wide. The crossstream
structure of baroclinic and absolute transport of the SAF has been characterized for the first time. The
integrated mean transport is 116+/-10 (x 10^6 m3/s), of which approximately 14% is barotropic, where barotropic
transport is defined to be the velocity at the deepest current meter (3320 dbar) multiplied by the water depth.
Comparison of the current meter measurements with hydrographic sections suggest this estimate is likely a lower bound on the absolute transport, as part of the 'cold side' of the SAF is not sampled by the moored array. Linear conditions for baroclinic and barotropic instability of the mean flow are satisfied at the array, consistent with earlier work that showed baroclinic conversion is the dominant mechanism for eddy growth at the array, with weaker barotropic conversion also occurring.</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">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Antarctic Circumpolar Current, velocity, current meter, instability</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">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">809</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">15 Mar 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">08 Feb 2008 12:38</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=809;">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=809">item control page</a></p>
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