The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments
Abstract 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 influ...
Published in: | Geochemistry, Geophysics, Geosystems |
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ftdoajarticles:oai:doaj.org/article:297effbab7de4b52810d6e77a0c798e1 2023-12-03T10:13:49+01:00 The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments K. Hochmuth K. Gohl G. Leitchenkov I. Sauermilch J. M. Whittaker G. Uenzelmann‐Neben B. Davy L. De Santis 2020-08-01T00:00:00Z https://doi.org/10.1029/2020GC009122 https://doaj.org/article/297effbab7de4b52810d6e77a0c798e1 EN eng Wiley https://doi.org/10.1029/2020GC009122 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009122 https://doaj.org/article/297effbab7de4b52810d6e77a0c798e1 Geochemistry, Geophysics, Geosystems, Vol 21, Iss 8, Pp n/a-n/a (2020) paleobathymetry Southern Ocean ocean gateways ice sheet glacial sedimentation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1029/2020GC009122 2023-11-05T01:36:02Z Abstract 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 Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean The Antarctic Geochemistry, Geophysics, Geosystems 21 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
paleobathymetry Southern Ocean ocean gateways ice sheet glacial sedimentation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
paleobathymetry Southern Ocean ocean gateways ice sheet glacial sedimentation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 K. Hochmuth K. Gohl G. Leitchenkov I. Sauermilch J. M. Whittaker G. Uenzelmann‐Neben B. Davy L. De Santis The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments |
topic_facet |
paleobathymetry Southern Ocean ocean gateways ice sheet glacial sedimentation Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract 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 |
K. Hochmuth K. Gohl G. Leitchenkov I. Sauermilch J. M. Whittaker G. Uenzelmann‐Neben B. Davy L. De Santis |
author_facet |
K. Hochmuth K. Gohl G. Leitchenkov I. Sauermilch J. M. Whittaker G. Uenzelmann‐Neben B. Davy L. De Santis |
author_sort |
K. Hochmuth |
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 |
Wiley |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020GC009122 https://doaj.org/article/297effbab7de4b52810d6e77a0c798e1 |
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_source |
Geochemistry, Geophysics, Geosystems, Vol 21, Iss 8, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2020GC009122 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009122 https://doaj.org/article/297effbab7de4b52810d6e77a0c798e1 |
op_doi |
https://doi.org/10.1029/2020GC009122 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
21 |
container_issue |
8 |
_version_ |
1784260756147011584 |