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

Citation

Hochmuth, K and Gohl, K and Leitchenkov, G and Sauermilch, I and Whittaker, JM and Uenzelmann-Neben, G and Davy, B and De Santis, L, The evolving paleobathymetry of the circum-Antarctic Southern Ocean since 34 Ma: a key to understanding past cryosphere-ocean developments, Geochemistry Geophysics Geosystems, 21, (8) Article e2020GC009122. ISSN 1525-2027 (2020) [Refereed Article]


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Copyright 2020 The Authors Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1029/2020GC009122

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.

Item Details

Item Type:Refereed Article
Keywords:Southern Ocean, bathymetry, plate tectonics
Research Division:Earth Sciences
Research Group:Geology
Research Field:Marine geoscience
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Sauermilch, I (Miss Isabel Sauermilch)
UTAS Author:Whittaker, JM (Associate Professor Jo Whittaker)
ID Code:141621
Year Published:2020
Funding Support:Australian Research Council (DP180102280)
Deposited By:Oceans and Cryosphere
Deposited On:2020-11-03
Last Modified:2021-02-18
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