Late winter oceanography off the Sabrina and BANZARE coast (117-128°E), East Antarctica
Identifieur interne : 004406 ( PascalFrancis/Curation ); précédent : 004405; suivant : 004407Late 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 :
- Deep-sea research. Part 2. Topical studies in oceanography [ 0967-0645 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Hiver, Océanographie, Océan Antarctique, Glace marine, Off shore, Ecosystème, Etude expérimentale, Programme, Courant marin, Masse eau, Levé, Flotteur dérivant, Réseau mesure, Isobathe, Versant, Courant pente, Profil vertical, Température potentielle, Couche mélangée, Iceberg, Polynie, Réfraction vague haut fond, Haut fond, Talus continental, Eté, Antarctique Est, Terre Wilkes, Eau fond Antarctique.
- Wicri :
- topic : Océanographie, Océan Antarctique.
English descriptors
- KwdEn :
- Antarctic Ocean, Antarctic bottom water, Drifting float, East Antarctica, Measuring network, Mixed layer, Polynya, Potential temperature, Slope current, Summer, Vertical profile, Water mass, Wilkes Land, Winter, continental slope, ecosystems, experimental studies, icebergs, isobaths, ocean currents, oceanography, offshore, programs, sea ice, shoaling, shoals, slopes, surveys.
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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<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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<fA66 i1="01"><s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG"><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>
</fC01>
<fC02 i1="01" i2="2"><s0>001E02B</s0>
</fC02>
<fC02 i1="02" i2="2"><s0>001E01P02</s0>
</fC02>
<fC02 i1="03" i2="2"><s0>001E01H</s0>
</fC02>
<fC02 i1="04" i2="2"><s0>226C02</s0>
</fC02>
<fC02 i1="05" i2="2"><s0>223B</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Hiver</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Winter</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Invierno</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Océanographie</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>oceanography</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="SPA"><s0>Oceanografía</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="2" l="FRE"><s0>Océan Antarctique</s0>
<s2>564</s2>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="ENG"><s0>Antarctic Ocean</s0>
<s2>564</s2>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Glace marine</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>sea ice</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Hielo marino</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Off shore</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>offshore</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="SPA"><s0>Off shore</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Ecosystème</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>ecosystems</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="SPA"><s0>Ecosistema</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Etude expérimentale</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>experimental studies</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="2" l="FRE"><s0>Programme</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="2" l="ENG"><s0>programs</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="2" l="SPA"><s0>Programa</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="2" l="FRE"><s0>Courant marin</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="2" l="ENG"><s0>ocean currents</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="2" l="SPA"><s0>Corriente marina</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Masse eau</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Water mass</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Masa agua</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Levé</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="ENG"><s0>surveys</s0>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Flotteur dérivant</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Drifting float</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Flotador desviando</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="X" l="FRE"><s0>Réseau mesure</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="ENG"><s0>Measuring network</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="X" l="SPA"><s0>Red medición</s0>
<s5>13</s5>
</fC03>
<fC03 i1="14" i2="2" l="FRE"><s0>Isobathe</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="2" l="ENG"><s0>isobaths</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="2" l="SPA"><s0>Isobata</s0>
<s5>14</s5>
</fC03>
<fC03 i1="15" i2="2" l="FRE"><s0>Versant</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="2" l="ENG"><s0>slopes</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="2" l="SPA"><s0>Declive</s0>
<s5>15</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Courant pente</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="X" l="ENG"><s0>Slope current</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="X" l="SPA"><s0>Corriente pendiente</s0>
<s5>16</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE"><s0>Profil vertical</s0>
<s5>17</s5>
</fC03>
<fC03 i1="17" i2="X" l="ENG"><s0>Vertical profile</s0>
<s5>17</s5>
</fC03>
<fC03 i1="17" i2="X" l="SPA"><s0>Perfil vertical</s0>
<s5>17</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>Température potentielle</s0>
<s5>18</s5>
</fC03>
<fC03 i1="18" i2="X" l="ENG"><s0>Potential temperature</s0>
<s5>18</s5>
</fC03>
<fC03 i1="18" i2="X" l="SPA"><s0>Temperatura potencial</s0>
<s5>18</s5>
</fC03>
<fC03 i1="19" i2="X" l="FRE"><s0>Couche mélangée</s0>
<s5>19</s5>
</fC03>
<fC03 i1="19" i2="X" l="ENG"><s0>Mixed layer</s0>
<s5>19</s5>
</fC03>
<fC03 i1="19" i2="X" l="SPA"><s0>Capa mezclada</s0>
<s5>19</s5>
</fC03>
<fC03 i1="20" i2="2" l="FRE"><s0>Iceberg</s0>
<s5>20</s5>
</fC03>
<fC03 i1="20" i2="2" l="ENG"><s0>icebergs</s0>
<s5>20</s5>
</fC03>
<fC03 i1="20" i2="2" l="SPA"><s0>Iceberg</s0>
<s5>20</s5>
</fC03>
<fC03 i1="21" i2="X" l="FRE"><s0>Polynie</s0>
<s5>21</s5>
</fC03>
<fC03 i1="21" i2="X" l="ENG"><s0>Polynya</s0>
<s5>21</s5>
</fC03>
<fC03 i1="21" i2="X" l="SPA"><s0>Polínia</s0>
<s5>21</s5>
</fC03>
<fC03 i1="22" i2="2" l="FRE"><s0>Réfraction vague haut fond</s0>
<s5>22</s5>
</fC03>
<fC03 i1="22" i2="2" l="ENG"><s0>shoaling</s0>
<s5>22</s5>
</fC03>
<fC03 i1="22" i2="2" l="SPA"><s0>Refracción ola alto fondo</s0>
<s5>22</s5>
</fC03>
<fC03 i1="23" i2="2" l="FRE"><s0>Haut fond</s0>
<s5>23</s5>
</fC03>
<fC03 i1="23" i2="2" l="ENG"><s0>shoals</s0>
<s5>23</s5>
</fC03>
<fC03 i1="23" i2="2" l="SPA"><s0>Gran fondo</s0>
<s5>23</s5>
</fC03>
<fC03 i1="24" i2="2" l="FRE"><s0>Talus continental</s0>
<s5>24</s5>
</fC03>
<fC03 i1="24" i2="2" l="ENG"><s0>continental slope</s0>
<s5>24</s5>
</fC03>
<fC03 i1="25" i2="X" l="FRE"><s0>Eté</s0>
<s5>25</s5>
</fC03>
<fC03 i1="25" i2="X" l="ENG"><s0>Summer</s0>
<s5>25</s5>
</fC03>
<fC03 i1="25" i2="X" l="SPA"><s0>Verano</s0>
<s5>25</s5>
</fC03>
<fC03 i1="26" i2="2" l="FRE"><s0>Antarctique Est</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="26" i2="2" l="ENG"><s0>East Antarctica</s0>
<s2>NG</s2>
<s5>61</s5>
</fC03>
<fC03 i1="27" i2="2" l="FRE"><s0>Terre Wilkes</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC03 i1="27" i2="2" l="ENG"><s0>Wilkes Land</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC03 i1="27" i2="2" l="SPA"><s0>Tierra Wilkes</s0>
<s2>NG</s2>
<s5>62</s5>
</fC03>
<fC03 i1="28" i2="2" l="FRE"><s0>Eau fond Antarctique</s0>
<s2>NG</s2>
<s5>63</s5>
</fC03>
<fC03 i1="28" i2="2" l="ENG"><s0>Antarctic bottom water</s0>
<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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