Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica
Vita. Descriptions of the characteristic relations, vertical structure and lateral spreading of Antarctic Bottom Water within the four major oceanic basins adjacent to Antarctica are presented. Three major layers of Antarctic Bottom Water are identified. Boundaries between these layers occur near th...
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fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/DISSERTATIONS-638480 2023-07-16T03:53:28+02:00 Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica Schlemmer, Frederick Charles Nowlin, Worth D. 1978 xi, 127 leaves electronic application/pdf reformatted digital https://hdl.handle.net/1969.1/DISSERTATIONS-638480 eng eng Texas A&M University. Libraries https://hdl.handle.net/1969.1/DISSERTATIONS-638480 4541120 This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ Ocean bottom Sea-floor spreading Submarine topography Oceanography 1978 Dissertation S341 Thesis dissertations text 1978 fttexasamuniv 2023-06-27T22:23:55Z Vita. Descriptions of the characteristic relations, vertical structure and lateral spreading of Antarctic Bottom Water within the four major oceanic basins adjacent to Antarctica are presented. Three major layers of Antarctic Bottom Water are identified. Boundaries between these layers occur near the surfaces where the potential densities referenced to 4000 db (σ₄) are 46.08 mg cm⁻³, 46.15 mg cm⁻³ (46.12 mg cm⁻³ in the Macquarie Ridge-Balleny Islands complex and western Southeast Pacific Basin) and 46.21 mg cm⁻³. These isopycnal surfaces are associated with strata of maximum stability and slope changes in the characteristic relations. The densest layer of Antarctic Bottom Water (σ₄ (greater than or equal to) 46.21 mg cm⁻³) occurs in two separate regions. In the central and western Atlantic-Indian Basin, this layer is comprised of Weddell Sea Bottom Water, characterized by low potential temperature (< 0.8 °C), salinity (34.63-34.67 °/ (two lower degree symbols)) and dissolved silicate concentration (<100 μM) and by high dissolved oxygen concentration (>5.7 ml/l). Over the southern Macquarie Ridge, this layer contains Ross Sea Bottom Water, marked by low potential temperature (-0.6 to -0.3 °C) and dissolved oxygen (5.5 to 5.7 ml/l). A part of the Ross Sea Bottom Water flows south of the Balleny Islands and into the South Indian Basin where it mixes with Adelie Coast Bottom Water. East of the Balleny Islands, the other part of the Ross Sea Bottom Water flows northward along the southern Macquarie Ridge and is rapidly mixed with Antarctic Bottom Water flowing eastward from the South Indian Basin. Thesis Antarc* Antarctic Antarctica Balleny Islands Ross Sea Weddell Sea Texas A&M University Digital Repository Antarctic Weddell Sea Ross Sea Balleny Islands Pacific Indian Weddell Southeast Pacific Basin ENVELOPE(-115.000,-115.000,-60.000,-60.000) Atlantic-Indian Basin ENVELOPE(15.000,15.000,-60.000,-60.000) South Indian Basin ENVELOPE(120.000,120.000,-60.000,-60.000) |
institution |
Open Polar |
collection |
Texas A&M University Digital Repository |
op_collection_id |
fttexasamuniv |
language |
English |
topic |
Ocean bottom Sea-floor spreading Submarine topography Oceanography 1978 Dissertation S341 |
spellingShingle |
Ocean bottom Sea-floor spreading Submarine topography Oceanography 1978 Dissertation S341 Schlemmer, Frederick Charles Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica |
topic_facet |
Ocean bottom Sea-floor spreading Submarine topography Oceanography 1978 Dissertation S341 |
description |
Vita. Descriptions of the characteristic relations, vertical structure and lateral spreading of Antarctic Bottom Water within the four major oceanic basins adjacent to Antarctica are presented. Three major layers of Antarctic Bottom Water are identified. Boundaries between these layers occur near the surfaces where the potential densities referenced to 4000 db (σ₄) are 46.08 mg cm⁻³, 46.15 mg cm⁻³ (46.12 mg cm⁻³ in the Macquarie Ridge-Balleny Islands complex and western Southeast Pacific Basin) and 46.21 mg cm⁻³. These isopycnal surfaces are associated with strata of maximum stability and slope changes in the characteristic relations. The densest layer of Antarctic Bottom Water (σ₄ (greater than or equal to) 46.21 mg cm⁻³) occurs in two separate regions. In the central and western Atlantic-Indian Basin, this layer is comprised of Weddell Sea Bottom Water, characterized by low potential temperature (< 0.8 °C), salinity (34.63-34.67 °/ (two lower degree symbols)) and dissolved silicate concentration (<100 μM) and by high dissolved oxygen concentration (>5.7 ml/l). Over the southern Macquarie Ridge, this layer contains Ross Sea Bottom Water, marked by low potential temperature (-0.6 to -0.3 °C) and dissolved oxygen (5.5 to 5.7 ml/l). A part of the Ross Sea Bottom Water flows south of the Balleny Islands and into the South Indian Basin where it mixes with Adelie Coast Bottom Water. East of the Balleny Islands, the other part of the Ross Sea Bottom Water flows northward along the southern Macquarie Ridge and is rapidly mixed with Antarctic Bottom Water flowing eastward from the South Indian Basin. |
author2 |
Nowlin, Worth D. |
format |
Thesis |
author |
Schlemmer, Frederick Charles |
author_facet |
Schlemmer, Frederick Charles |
author_sort |
Schlemmer, Frederick Charles |
title |
Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica |
title_short |
Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica |
title_full |
Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica |
title_fullStr |
Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica |
title_full_unstemmed |
Structure and spreading of Antarctic bottom waters in oceanic basins adjacent to Antarctica |
title_sort |
structure and spreading of antarctic bottom waters in oceanic basins adjacent to antarctica |
publisher |
Texas A&M University. Libraries |
publishDate |
1978 |
url |
https://hdl.handle.net/1969.1/DISSERTATIONS-638480 |
long_lat |
ENVELOPE(-115.000,-115.000,-60.000,-60.000) ENVELOPE(15.000,15.000,-60.000,-60.000) ENVELOPE(120.000,120.000,-60.000,-60.000) |
geographic |
Antarctic Weddell Sea Ross Sea Balleny Islands Pacific Indian Weddell Southeast Pacific Basin Atlantic-Indian Basin South Indian Basin |
geographic_facet |
Antarctic Weddell Sea Ross Sea Balleny Islands Pacific Indian Weddell Southeast Pacific Basin Atlantic-Indian Basin South Indian Basin |
genre |
Antarc* Antarctic Antarctica Balleny Islands Ross Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Balleny Islands Ross Sea Weddell Sea |
op_relation |
https://hdl.handle.net/1969.1/DISSERTATIONS-638480 4541120 |
op_rights |
This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ |
_version_ |
1771550619988918272 |