West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data

Observations of rapid ongoing grounding line retreat, ice shelf thinning and accelerated ice flow from the West Antarctic Ice Sheet (WAIS) may forebode a possible collapse if global temperatures continue to increase. Understanding and reconstructing West Antarctic Ice Sheet dynamics in past warmer-t...

Full description

Bibliographic Details
Published in:Frontiers in Earth Science
Main Authors: Gille-Petzoldt, Johanna, Gohl, Karsten, Uenzelmann-Neben, Gabriele, Grützner, Jens, Klages, Johann P.
Format: Article in Journal/Newspaper
Language:unknown
Published: Frontiers Media SA 2022
Subjects:
Online Access:http://dx.doi.org/10.3389/feart.2022.976703
https://www.frontiersin.org/articles/10.3389/feart.2022.976703/full
id crfrontiers:10.3389/feart.2022.976703
record_format openpolar
spelling crfrontiers:10.3389/feart.2022.976703 2024-06-23T07:45:26+00:00 West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data Gille-Petzoldt, Johanna Gohl, Karsten Uenzelmann-Neben, Gabriele Grützner, Jens Klages, Johann P. 2022 http://dx.doi.org/10.3389/feart.2022.976703 https://www.frontiersin.org/articles/10.3389/feart.2022.976703/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 10 ISSN 2296-6463 journal-article 2022 crfrontiers https://doi.org/10.3389/feart.2022.976703 2024-06-11T04:06:14Z Observations of rapid ongoing grounding line retreat, ice shelf thinning and accelerated ice flow from the West Antarctic Ice Sheet (WAIS) may forebode a possible collapse if global temperatures continue to increase. Understanding and reconstructing West Antarctic Ice Sheet dynamics in past warmer-than-present times will inform about its behavior as an analogue for future climate scenarios. International Ocean Discovery Program (IODP) Expedition 379 visited the Amundsen Sea sector of Antarctica to obtain geological records suitable for this purpose. During the expedition, cores from two drill sites at the Resolution Drift on the continental rise returned sediments whose deposition was possibly influenced by West Antarctic Ice Sheet dynamics from late Miocene to Holocene times. To examine the West Antarctic Ice Sheet dynamics, shipboard physical properties and sedimentological data are correlated with seismic data and extrapolated across the Resolution Drift via core-log-seismic integration. An interval with strongly variable physical properties, high diatom abundance and ice-rafted debris occurrence, correlating with partially high amplitude seismic reflection characteristics was identified between 4.2 and 3.2 Ma. Sedimentation during this interval is interpreted as having occurred during an extended warm period with a dynamic West Antarctic Ice Sheet in the Amundsen Sea sector. These records compare to those of other drill sites in the Ross Sea and the Bellingshausen Sea, and thus suggest an almost simultaneous occurrence of extended warm periods in all three locations. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Bellingshausen Sea Ice Sheet Ice Shelf Ross Sea Frontiers (Publisher) Amundsen Sea Antarctic Bellingshausen Sea Ross Sea West Antarctic Ice Sheet Frontiers in Earth Science 10
institution Open Polar
collection Frontiers (Publisher)
op_collection_id crfrontiers
language unknown
description Observations of rapid ongoing grounding line retreat, ice shelf thinning and accelerated ice flow from the West Antarctic Ice Sheet (WAIS) may forebode a possible collapse if global temperatures continue to increase. Understanding and reconstructing West Antarctic Ice Sheet dynamics in past warmer-than-present times will inform about its behavior as an analogue for future climate scenarios. International Ocean Discovery Program (IODP) Expedition 379 visited the Amundsen Sea sector of Antarctica to obtain geological records suitable for this purpose. During the expedition, cores from two drill sites at the Resolution Drift on the continental rise returned sediments whose deposition was possibly influenced by West Antarctic Ice Sheet dynamics from late Miocene to Holocene times. To examine the West Antarctic Ice Sheet dynamics, shipboard physical properties and sedimentological data are correlated with seismic data and extrapolated across the Resolution Drift via core-log-seismic integration. An interval with strongly variable physical properties, high diatom abundance and ice-rafted debris occurrence, correlating with partially high amplitude seismic reflection characteristics was identified between 4.2 and 3.2 Ma. Sedimentation during this interval is interpreted as having occurred during an extended warm period with a dynamic West Antarctic Ice Sheet in the Amundsen Sea sector. These records compare to those of other drill sites in the Ross Sea and the Bellingshausen Sea, and thus suggest an almost simultaneous occurrence of extended warm periods in all three locations.
format Article in Journal/Newspaper
author Gille-Petzoldt, Johanna
Gohl, Karsten
Uenzelmann-Neben, Gabriele
Grützner, Jens
Klages, Johann P.
spellingShingle Gille-Petzoldt, Johanna
Gohl, Karsten
Uenzelmann-Neben, Gabriele
Grützner, Jens
Klages, Johann P.
West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data
author_facet Gille-Petzoldt, Johanna
Gohl, Karsten
Uenzelmann-Neben, Gabriele
Grützner, Jens
Klages, Johann P.
author_sort Gille-Petzoldt, Johanna
title West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data
title_short West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data
title_full West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data
title_fullStr West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data
title_full_unstemmed West Antarctic Ice Sheet Dynamics in the Amundsen Sea Sector since the Late Miocene—Tying IODP Expedition 379 Results to Seismic Data
title_sort west antarctic ice sheet dynamics in the amundsen sea sector since the late miocene—tying iodp expedition 379 results to seismic data
publisher Frontiers Media SA
publishDate 2022
url http://dx.doi.org/10.3389/feart.2022.976703
https://www.frontiersin.org/articles/10.3389/feart.2022.976703/full
geographic Amundsen Sea
Antarctic
Bellingshausen Sea
Ross Sea
West Antarctic Ice Sheet
geographic_facet Amundsen Sea
Antarctic
Bellingshausen Sea
Ross Sea
West Antarctic Ice Sheet
genre Amundsen Sea
Antarc*
Antarctic
Antarctica
Bellingshausen Sea
Ice Sheet
Ice Shelf
Ross Sea
genre_facet Amundsen Sea
Antarc*
Antarctic
Antarctica
Bellingshausen Sea
Ice Sheet
Ice Shelf
Ross Sea
op_source Frontiers in Earth Science
volume 10
ISSN 2296-6463
op_rights https://creativecommons.org/licenses/by/4.0/
op_doi https://doi.org/10.3389/feart.2022.976703
container_title Frontiers in Earth Science
container_volume 10
_version_ 1802639662255177728