The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments

The Southern Ocean is a key player in the climate, ocean, and atmospheric system. As the only direct connection between all three major oceans since the opening of the Southern Ocean gateways, the development of the Southern Ocean and its relationship with the Antarctic cryosphere has influenced the...

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Published in:Geochemistry, Geophysics, Geosystems
Main Authors: Hochmuth, K, Gohl, K, Leitchenkov, G, Sauermilch, I, Whittaker, JM, Uenzelmann-Neben, G, Davy, B, De Santis, L
Format: Article in Journal/Newspaper
Language:English
Published: Amer Geophysical Union 2020
Subjects:
Online Access:https://eprints.utas.edu.au/35409/
https://eprints.utas.edu.au/35409/1/141621%20-%20The%20evolving%20paleobathymetry%20of%20the%20circum-Antarctic%20Southern%20Ocean%20since%2034%20Ma.pdf
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spelling ftunivtasmania:oai:eprints.utas.edu.au:35409 2023-05-15T13:42:39+02:00 The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments Hochmuth, K Gohl, K Leitchenkov, G Sauermilch, I Whittaker, JM Uenzelmann-Neben, G Davy, B De Santis, L 2020 application/pdf https://eprints.utas.edu.au/35409/ https://eprints.utas.edu.au/35409/1/141621%20-%20The%20evolving%20paleobathymetry%20of%20the%20circum-Antarctic%20Southern%20Ocean%20since%2034%20Ma.pdf en eng Amer Geophysical Union https://eprints.utas.edu.au/35409/1/141621%20-%20The%20evolving%20paleobathymetry%20of%20the%20circum-Antarctic%20Southern%20Ocean%20since%2034%20Ma.pdf Hochmuth, K, Gohl, K, Leitchenkov, G, Sauermilch, I orcid:0000-0003-4639-6699 , Whittaker, JM orcid:0000-0002-3170-3935 , Uenzelmann-Neben, G, Davy, B and De Santis, L 2020 , 'The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments' , Geochemistry Geophysics Geosystems, vol. 21, no. 8 , pp. 1-28 , doi:10.1029/2020GC009122 <http://dx.doi.org/10.1029/2020GC009122>. Southern Ocean bathymetry plate tectonics Article PeerReviewed 2020 ftunivtasmania https://doi.org/10.1029/2020GC009122 2021-10-04T22:19:16Z The Southern Ocean is a key player in the climate, ocean, and atmospheric system. As the only direct connection between all three major oceans since the opening of the Southern Ocean gateways, the development of the Southern Ocean and its relationship with the Antarctic cryosphere has influenced the climate of the entire planet. Although the depths of the ocean floor have been recognized as an important factor in climate and paleoclimate models, appropriate paleobathymetric models including a detailed analysis of the sediment cover are not available. Here we utilize more than 40 years of seismic reflection data acquisition along the margins of Antarctica and its conjugate margins, along with multiple drilling campaigns by the International Ocean Discovery Program (IODP) and its predecessor programs. We combine and update the seismic stratigraphy across the regions of the Southern Ocean and calculate ocean‐wide paleobathymetry grids via a backstripping method. We present a suite of high‐resolution paleobathymetric grids from the Eocene‐Oligocene Boundary to modern times. The grids reveal the development of the Southern Ocean from isolated basins to an interconnected ocean affected by the onset and vigor of an Antarctic Circumpolar Current, as well as the glacial sedimentation and erosion of the Antarctic continent. The ocean‐wide comparison through time exposes patterns of ice sheet development such as switching of glacial outlets and the change from wet‐based to dry‐based ice sheets. Ocean currents and bottom‐water production interact with the sedimentation along the continental shelf and slope and profit from the opening of the ocean gateways. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean The Antarctic Geochemistry, Geophysics, Geosystems 21 8
institution Open Polar
collection University of Tasmania: UTas ePrints
op_collection_id ftunivtasmania
language English
topic Southern Ocean
bathymetry
plate tectonics
spellingShingle Southern Ocean
bathymetry
plate tectonics
Hochmuth, K
Gohl, K
Leitchenkov, G
Sauermilch, I
Whittaker, JM
Uenzelmann-Neben, G
Davy, B
De Santis, L
The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments
topic_facet Southern Ocean
bathymetry
plate tectonics
description The Southern Ocean is a key player in the climate, ocean, and atmospheric system. As the only direct connection between all three major oceans since the opening of the Southern Ocean gateways, the development of the Southern Ocean and its relationship with the Antarctic cryosphere has influenced the climate of the entire planet. Although the depths of the ocean floor have been recognized as an important factor in climate and paleoclimate models, appropriate paleobathymetric models including a detailed analysis of the sediment cover are not available. Here we utilize more than 40 years of seismic reflection data acquisition along the margins of Antarctica and its conjugate margins, along with multiple drilling campaigns by the International Ocean Discovery Program (IODP) and its predecessor programs. We combine and update the seismic stratigraphy across the regions of the Southern Ocean and calculate ocean‐wide paleobathymetry grids via a backstripping method. We present a suite of high‐resolution paleobathymetric grids from the Eocene‐Oligocene Boundary to modern times. The grids reveal the development of the Southern Ocean from isolated basins to an interconnected ocean affected by the onset and vigor of an Antarctic Circumpolar Current, as well as the glacial sedimentation and erosion of the Antarctic continent. The ocean‐wide comparison through time exposes patterns of ice sheet development such as switching of glacial outlets and the change from wet‐based to dry‐based ice sheets. Ocean currents and bottom‐water production interact with the sedimentation along the continental shelf and slope and profit from the opening of the ocean gateways.
format Article in Journal/Newspaper
author Hochmuth, K
Gohl, K
Leitchenkov, G
Sauermilch, I
Whittaker, JM
Uenzelmann-Neben, G
Davy, B
De Santis, L
author_facet Hochmuth, K
Gohl, K
Leitchenkov, G
Sauermilch, I
Whittaker, JM
Uenzelmann-Neben, G
Davy, B
De Santis, L
author_sort Hochmuth, K
title The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments
title_short The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments
title_full The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments
title_fullStr The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments
title_full_unstemmed The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments
title_sort evolving paleobathymetry of the circum-antarctic southern ocean since 34 ma: a key to understanding past cryosphere‐ocean developments
publisher Amer Geophysical Union
publishDate 2020
url https://eprints.utas.edu.au/35409/
https://eprints.utas.edu.au/35409/1/141621%20-%20The%20evolving%20paleobathymetry%20of%20the%20circum-Antarctic%20Southern%20Ocean%20since%2034%20Ma.pdf
geographic Antarctic
Southern Ocean
The Antarctic
geographic_facet Antarctic
Southern Ocean
The Antarctic
genre Antarc*
Antarctic
Antarctica
Ice Sheet
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctica
Ice Sheet
Southern Ocean
op_relation https://eprints.utas.edu.au/35409/1/141621%20-%20The%20evolving%20paleobathymetry%20of%20the%20circum-Antarctic%20Southern%20Ocean%20since%2034%20Ma.pdf
Hochmuth, K, Gohl, K, Leitchenkov, G, Sauermilch, I orcid:0000-0003-4639-6699 , Whittaker, JM orcid:0000-0002-3170-3935 , Uenzelmann-Neben, G, Davy, B and De Santis, L 2020 , 'The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere‐ocean developments' , Geochemistry Geophysics Geosystems, vol. 21, no. 8 , pp. 1-28 , doi:10.1029/2020GC009122 <http://dx.doi.org/10.1029/2020GC009122>.
op_doi https://doi.org/10.1029/2020GC009122
container_title Geochemistry, Geophysics, Geosystems
container_volume 21
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