Serveur d'exploration sur les relations entre la France et l'Australie

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Late winter oceanography off the Sabrina and BANZARE coast (117-128°E), East Antarctica

Identifieur interne : 004406 ( PascalFrancis/Curation ); précédent : 004405; suivant : 004407

Late winter oceanography off the Sabrina and BANZARE coast (117-128°E), East Antarctica

Auteurs : G. D. Williams [Japon, Australie] ; A. J. S. Meijers [Australie] ; A. Poole [Australie] ; P. Mathiot [France] ; T. Tamura [Japon, Australie] ; A. Klocker [Australie]

Source :

RBID : Pascal:11-0307603

Descripteurs français

English descriptors

Abstract

We report on the late winter oceanography observed beneath the Antarctic sea ice offshore from the Sabrina and BANZARE coast of Wilkes Land, East Antarctica ( 117-128°E) in September-October 2007 during the Sea Ice Physics and Ecosystem experiment (SIPEX). A pilot program using specifically designed 'through-ice' conductivity-temperature-depth (CTD) and acoustic Doppler current profiling (ADCP) systems was conducted to opportunistically measure water mass properties and ocean currents at major ice stations. Additional water mass properties across the survey region were collected from Ice-Argo floats deployed during the voyage north of the 3000 m isobath. The mean drift of the floats was along the slope to the west with the Antarctic Slope Current. Vertical profiles of the potential temperature reveal the deepest (∼350-400 m) winter mixed layer (WML) in the western sector of the survey northwest of the Dalton Iceberg Tongue polynya. The meridional structure of the Antarctic Slope Front, i.e. the monotonic shoaling of the WML across the upper continental slope, is found to be similar to the previous observations in summer. A strong bottom-intensified intrusion of modified Circumpolar Deep Water (mCDW) as warm as 0 °C was detected beneath the fast ice south of the continental shelf break at 118°E. An mCDW intrusion of similar strength was detected near this location in the austral summer of 1996. We hypothesise that there is a persistent supply of mCDW and associated ocean heat flux to this region of the continental shelf that is capable of migrating to the grounding lines of the nearby Totten Glacier and Moscow University Ice Shelf. There was no detection of locally formed dense shelf water capable of forming Antarctic Bottom Water at the shelf break locations sampled despite the number of minor polynyas across this region. Ocean current measurements, limited to a maximum period of 24 h and 50-100 m depth by the relative scarcity of backscatter, found increased mean vertical speeds at the offshore stations (6-17 cm s-1) relative to the shelf break (2.3-6.4 cm s-1). The diurnal variation in the ADCP range reflected the diel migration of zooplankton occurring beneath the sea ice in late winter, with greater range/abundance offshore.
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A08 01  1  ENG  @1 Late winter oceanography off the Sabrina and BANZARE coast (117-128°E), East Antarctica
A09 01  1  ENG  @1 Antarctic Sea Ice Zone Research during the International Polar Year 2007-2009
A11 01  1    @1 WILLIAMS (G. D.)
A11 02  1    @1 MEIJERS (A. J. S.)
A11 03  1    @1 POOLE (A.)
A11 04  1    @1 MATHIOT (P.)
A11 05  1    @1 TAMURA (T.)
A11 06  1    @1 KLOCKER (A.)
A12 01  1    @1 WORBY (Anthony P.) @9 ed.
A12 02  1    @1 FRITSEN (Christian H.) @9 ed.
A12 03  1    @1 GEIGER (Cathleen A.) @9 ed.
A12 04  1    @1 HEIL (Petra) @9 ed.
A12 05  1    @1 MEINERS (Klaus M.) @9 ed.
A12 06  1    @1 MILLER (Lisa A.) @9 ed.
A14 01      @1 Institute for Low Temperature Science, Hokkaido University @2 Sapporo @3 JPN @Z 1 aut. @Z 5 aut.
A14 02      @1 Antarctic Climate and Ecosystem Cooperative Research Centre @2 Sandy Bay @3 AUS @Z 1 aut. @Z 2 aut. @Z 5 aut. @Z 6 aut.
A14 03      @1 Department of the Environment, Water, Heritage and the Arts, Australian Antarctic Division @2 Kingston @3 AUS @Z 3 aut.
A14 04      @1 Centre for Australian Weather and Climate Research, CSIRO @2 Hobart @3 AUS @Z 2 aut. @Z 3 aut.
A14 05      @1 Laboratoire des Ecoulements Géophysique et Industriels, Université Joseph Fourier @2 Grenoble @3 FRA @Z 4 aut.
A15 01      @1 Australian Antarctic Division @2 Kingston @3 AUS @Z 1 aut. @Z 4 aut. @Z 5 aut.
A15 02      @1 Antarctic Climate and Ecosystems Cooperative Research Centre @2 Hobart, Tasmania @3 AUS @Z 1 aut. @Z 4 aut. @Z 5 aut.
A15 03      @1 Division of Earth and Ecosystem Sciences, Desert Research Institute @2 Reno, Nevada @3 USA @Z 2 aut.
A15 04      @1 Department of Geography, University of Delaware @2 Newark, Delaware @3 USA @Z 3 aut.
A15 05      @1 Centre for Ocean Climate Chemistry, Institute of Ocean Sciences @2 Sidney, British Columbia @3 CAN @Z 6 aut.
A20       @1 1194-1210
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C01 01    ENG  @0 We report on the late winter oceanography observed beneath the Antarctic sea ice offshore from the Sabrina and BANZARE coast of Wilkes Land, East Antarctica ( 117-128°E) in September-October 2007 during the Sea Ice Physics and Ecosystem experiment (SIPEX). A pilot program using specifically designed 'through-ice' conductivity-temperature-depth (CTD) and acoustic Doppler current profiling (ADCP) systems was conducted to opportunistically measure water mass properties and ocean currents at major ice stations. Additional water mass properties across the survey region were collected from Ice-Argo floats deployed during the voyage north of the 3000 m isobath. The mean drift of the floats was along the slope to the west with the Antarctic Slope Current. Vertical profiles of the potential temperature reveal the deepest (∼350-400 m) winter mixed layer (WML) in the western sector of the survey northwest of the Dalton Iceberg Tongue polynya. The meridional structure of the Antarctic Slope Front, i.e. the monotonic shoaling of the WML across the upper continental slope, is found to be similar to the previous observations in summer. A strong bottom-intensified intrusion of modified Circumpolar Deep Water (mCDW) as warm as 0 °C was detected beneath the fast ice south of the continental shelf break at 118°E. An mCDW intrusion of similar strength was detected near this location in the austral summer of 1996. We hypothesise that there is a persistent supply of mCDW and associated ocean heat flux to this region of the continental shelf that is capable of migrating to the grounding lines of the nearby Totten Glacier and Moscow University Ice Shelf. There was no detection of locally formed dense shelf water capable of forming Antarctic Bottom Water at the shelf break locations sampled despite the number of minor polynyas across this region. Ocean current measurements, limited to a maximum period of 24 h and 50-100 m depth by the relative scarcity of backscatter, found increased mean vertical speeds at the offshore stations (6-17 cm s-1) relative to the shelf break (2.3-6.4 cm s-1). The diurnal variation in the ADCP range reflected the diel migration of zooplankton occurring beneath the sea ice in late winter, with greater range/abundance offshore.
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C03 28  2  FRE  @0 Eau fond Antarctique @2 NG @5 63
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Pascal:11-0307603

Le document en format XML

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<term>Summer</term>
<term>Vertical profile</term>
<term>Water mass</term>
<term>Wilkes Land</term>
<term>Winter</term>
<term>continental slope</term>
<term>ecosystems</term>
<term>experimental studies</term>
<term>icebergs</term>
<term>isobaths</term>
<term>ocean currents</term>
<term>oceanography</term>
<term>offshore</term>
<term>programs</term>
<term>sea ice</term>
<term>shoaling</term>
<term>shoals</term>
<term>slopes</term>
<term>surveys</term>
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<term>Hiver</term>
<term>Océanographie</term>
<term>Océan Antarctique</term>
<term>Glace marine</term>
<term>Off shore</term>
<term>Ecosystème</term>
<term>Etude expérimentale</term>
<term>Programme</term>
<term>Courant marin</term>
<term>Masse eau</term>
<term>Levé</term>
<term>Flotteur dérivant</term>
<term>Réseau mesure</term>
<term>Isobathe</term>
<term>Versant</term>
<term>Courant pente</term>
<term>Profil vertical</term>
<term>Température potentielle</term>
<term>Couche mélangée</term>
<term>Iceberg</term>
<term>Polynie</term>
<term>Réfraction vague haut fond</term>
<term>Haut fond</term>
<term>Talus continental</term>
<term>Eté</term>
<term>Antarctique Est</term>
<term>Terre Wilkes</term>
<term>Eau fond Antarctique</term>
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<term>Océanographie</term>
<term>Océan Antarctique</term>
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<front>
<div type="abstract" xml:lang="en">We report on the late winter oceanography observed beneath the Antarctic sea ice offshore from the Sabrina and BANZARE coast of Wilkes Land, East Antarctica ( 117-128°E) in September-October 2007 during the Sea Ice Physics and Ecosystem experiment (SIPEX). A pilot program using specifically designed 'through-ice' conductivity-temperature-depth (CTD) and acoustic Doppler current profiling (ADCP) systems was conducted to opportunistically measure water mass properties and ocean currents at major ice stations. Additional water mass properties across the survey region were collected from Ice-Argo floats deployed during the voyage north of the 3000 m isobath. The mean drift of the floats was along the slope to the west with the Antarctic Slope Current. Vertical profiles of the potential temperature reveal the deepest (∼350-400 m) winter mixed layer (WML) in the western sector of the survey northwest of the Dalton Iceberg Tongue polynya. The meridional structure of the Antarctic Slope Front, i.e. the monotonic shoaling of the WML across the upper continental slope, is found to be similar to the previous observations in summer. A strong bottom-intensified intrusion of modified Circumpolar Deep Water (mCDW) as warm as 0 °C was detected beneath the fast ice south of the continental shelf break at 118°E. An mCDW intrusion of similar strength was detected near this location in the austral summer of 1996. We hypothesise that there is a persistent supply of mCDW and associated ocean heat flux to this region of the continental shelf that is capable of migrating to the grounding lines of the nearby Totten Glacier and Moscow University Ice Shelf. There was no detection of locally formed dense shelf water capable of forming Antarctic Bottom Water at the shelf break locations sampled despite the number of minor polynyas across this region. Ocean current measurements, limited to a maximum period of 24 h and 50-100 m depth by the relative scarcity of backscatter, found increased mean vertical speeds at the offshore stations (6-17 cm s
<sup>-1</sup>
) relative to the shelf break (2.3-6.4 cm s
<sup>-1</sup>
). The diurnal variation in the ADCP range reflected the diel migration of zooplankton occurring beneath the sea ice in late winter, with greater range/abundance offshore.</div>
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<s0>We report on the late winter oceanography observed beneath the Antarctic sea ice offshore from the Sabrina and BANZARE coast of Wilkes Land, East Antarctica ( 117-128°E) in September-October 2007 during the Sea Ice Physics and Ecosystem experiment (SIPEX). A pilot program using specifically designed 'through-ice' conductivity-temperature-depth (CTD) and acoustic Doppler current profiling (ADCP) systems was conducted to opportunistically measure water mass properties and ocean currents at major ice stations. Additional water mass properties across the survey region were collected from Ice-Argo floats deployed during the voyage north of the 3000 m isobath. The mean drift of the floats was along the slope to the west with the Antarctic Slope Current. Vertical profiles of the potential temperature reveal the deepest (∼350-400 m) winter mixed layer (WML) in the western sector of the survey northwest of the Dalton Iceberg Tongue polynya. The meridional structure of the Antarctic Slope Front, i.e. the monotonic shoaling of the WML across the upper continental slope, is found to be similar to the previous observations in summer. A strong bottom-intensified intrusion of modified Circumpolar Deep Water (mCDW) as warm as 0 °C was detected beneath the fast ice south of the continental shelf break at 118°E. An mCDW intrusion of similar strength was detected near this location in the austral summer of 1996. We hypothesise that there is a persistent supply of mCDW and associated ocean heat flux to this region of the continental shelf that is capable of migrating to the grounding lines of the nearby Totten Glacier and Moscow University Ice Shelf. There was no detection of locally formed dense shelf water capable of forming Antarctic Bottom Water at the shelf break locations sampled despite the number of minor polynyas across this region. Ocean current measurements, limited to a maximum period of 24 h and 50-100 m depth by the relative scarcity of backscatter, found increased mean vertical speeds at the offshore stations (6-17 cm s
<sup>-1</sup>
) relative to the shelf break (2.3-6.4 cm s
<sup>-1</sup>
). The diurnal variation in the ADCP range reflected the diel migration of zooplankton occurring beneath the sea ice in late winter, with greater range/abundance offshore.</s0>
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<s0>Courant pente</s0>
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<fC03 i1="16" i2="X" l="ENG">
<s0>Slope current</s0>
<s5>16</s5>
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<s0>Corriente pendiente</s0>
<s5>16</s5>
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<s0>Profil vertical</s0>
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<s0>Vertical profile</s0>
<s5>17</s5>
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<s5>17</s5>
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<s5>18</s5>
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<s5>22</s5>
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<s5>22</s5>
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<s5>23</s5>
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<s5>23</s5>
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<s5>23</s5>
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<s5>25</s5>
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<s0>Antarctique Est</s0>
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<s5>61</s5>
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<s5>61</s5>
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<fC03 i1="27" i2="2" l="FRE">
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<s2>NG</s2>
<s5>62</s5>
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<s2>NG</s2>
<s5>62</s5>
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<s0>Tierra Wilkes</s0>
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<s5>62</s5>
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<s0>Eau fond Antarctique</s0>
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<s5>63</s5>
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<s2>NG</s2>
<s5>63</s5>
</fC03>
<fC07 i1="01" i2="2" l="FRE">
<s0>Antarctique</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG">
<s0>Antarctica</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA">
<s0>Antártico</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE">
<s0>Région Polaire</s0>
<s2>564</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG">
<s0>polar regions</s0>
<s2>564</s2>
</fC07>
<fN21>
<s1>206</s1>
</fN21>
<fN44 i1="01">
<s1>OTO</s1>
</fN44>
<fN82>
<s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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   |wiki=    Wicri/Asie
   |area=    AustralieFrV1
   |flux=    PascalFrancis
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   |texte=   Late winter oceanography off the Sabrina and BANZARE coast (117-128°E), East Antarctica
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Data generation: Tue Dec 5 10:43:12 2017. Site generation: Tue Mar 5 14:07:20 2024