On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica
Cape Darnley Bottom Water (CDBW) is a major contributor to Antarctic Bottom Water (AABW) formation in the MacRobertson Land continental shelf area, East Antarctica. As the production of CDBW is dependent on intense sea ice formation in the Cape Darnley Polynya Region, it is sensitive to climatic cha...
Published in: | Marine Geology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2022
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/55771/ https://epic.awi.de/id/eprint/55771/2/2022NielsenandUenzelmannNeben.pdf https://doi.org/10.1016/j.margeo.2022.106735 https://hdl.handle.net/10013/epic.88f98ade-786c-4b6f-8fed-853712df698a https://hdl.handle.net/ |
id |
ftawi:oai:epic.awi.de:55771 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:55771 2023-05-15T13:45:22+02:00 On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica Nielsen, Ricarda Uenzelmann-Neben, Gabriele 2022 application/pdf https://epic.awi.de/id/eprint/55771/ https://epic.awi.de/id/eprint/55771/2/2022NielsenandUenzelmannNeben.pdf https://doi.org/10.1016/j.margeo.2022.106735 https://hdl.handle.net/10013/epic.88f98ade-786c-4b6f-8fed-853712df698a https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/55771/2/2022NielsenandUenzelmannNeben.pdf https://hdl.handle.net/ Nielsen, R. orcid:0000-0002-1232-2950 and Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 (2022) On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica , Marine Geology, 445 , p. 106735 . doi:10.1016/j.margeo.2022.106735 <https://doi.org/10.1016/j.margeo.2022.106735> , hdl:10013/epic.88f98ade-786c-4b6f-8fed-853712df698a EPIC3Marine Geology, 445, pp. 106735, ISSN: 00253227 Article isiRev 2022 ftawi https://doi.org/10.1016/j.margeo.2022.106735 2022-03-07T00:09:41Z Cape Darnley Bottom Water (CDBW) is a major contributor to Antarctic Bottom Water (AABW) formation in the MacRobertson Land continental shelf area, East Antarctica. As the production of CDBW is dependent on intense sea ice formation in the Cape Darnley Polynya Region, it is sensitive to climatic changes, such as global warming. Studying paleo-conditions of CDBW during Antarctica’s transition from coolhouse to icehouse during the middle to late Miocene allows to gain knowledge about the onset of bottom water production in the Cosmonaut/Prydz Bay region as well as changes in the strength and outflow path of the CDBW. In order to study the paleo-conditions of the CDBW, we have investigated the formation history of a 200 km long, 70 km wide sediment drift (Darnley Drift herein) at the western flank of Wild Canyon. In the early Miocene, the upper rise was dominated by turbiditic channel-levee growth and large continental sediment supply off the MacRobertson Land continental shelf. Therefore, no indications of CDBW formation were observed. During the middle Miocene, the dominant sediment transport regime transformed from turbiditic to contouritic mode, mirroring Antarctica’s climatic transition into an icehouse world. This climatic transformation caused the initiation of CDBW, which is inferred from the onset of Darnley Drift formation as a levee-drift and its growth to a maximum areal extent of 60,000 km2, four times the size of today. Since the late Miocene/early Pliocene the sedimentation rate has been strongly reduced and bottom current controlled deposition dominated. The growth of mixed levee-drifts along the continental slope-rise transition parallel to Darnley Drift suggests an intensifi- cation of paleo CDBW generation and outflow to be comparable to observations of recent CDBW, in addition to an intensification of the Antarctic Slope Front and Circumpolar Deep Water. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica MacRobertson Land Prydz Bay Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Cape Darnley ENVELOPE(69.567,69.567,-67.738,-67.738) Darnley ENVELOPE(69.717,69.717,-67.717,-67.717) East Antarctica MacRobertson Land ENVELOPE(65.000,65.000,-70.000,-70.000) Prydz Bay The Antarctic Wild Canyon ENVELOPE(67.000,67.000,-66.000,-66.000) Marine Geology 445 106735 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Cape Darnley Bottom Water (CDBW) is a major contributor to Antarctic Bottom Water (AABW) formation in the MacRobertson Land continental shelf area, East Antarctica. As the production of CDBW is dependent on intense sea ice formation in the Cape Darnley Polynya Region, it is sensitive to climatic changes, such as global warming. Studying paleo-conditions of CDBW during Antarctica’s transition from coolhouse to icehouse during the middle to late Miocene allows to gain knowledge about the onset of bottom water production in the Cosmonaut/Prydz Bay region as well as changes in the strength and outflow path of the CDBW. In order to study the paleo-conditions of the CDBW, we have investigated the formation history of a 200 km long, 70 km wide sediment drift (Darnley Drift herein) at the western flank of Wild Canyon. In the early Miocene, the upper rise was dominated by turbiditic channel-levee growth and large continental sediment supply off the MacRobertson Land continental shelf. Therefore, no indications of CDBW formation were observed. During the middle Miocene, the dominant sediment transport regime transformed from turbiditic to contouritic mode, mirroring Antarctica’s climatic transition into an icehouse world. This climatic transformation caused the initiation of CDBW, which is inferred from the onset of Darnley Drift formation as a levee-drift and its growth to a maximum areal extent of 60,000 km2, four times the size of today. Since the late Miocene/early Pliocene the sedimentation rate has been strongly reduced and bottom current controlled deposition dominated. The growth of mixed levee-drifts along the continental slope-rise transition parallel to Darnley Drift suggests an intensifi- cation of paleo CDBW generation and outflow to be comparable to observations of recent CDBW, in addition to an intensification of the Antarctic Slope Front and Circumpolar Deep Water. |
format |
Article in Journal/Newspaper |
author |
Nielsen, Ricarda Uenzelmann-Neben, Gabriele |
spellingShingle |
Nielsen, Ricarda Uenzelmann-Neben, Gabriele On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica |
author_facet |
Nielsen, Ricarda Uenzelmann-Neben, Gabriele |
author_sort |
Nielsen, Ricarda |
title |
On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica |
title_short |
On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica |
title_full |
On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica |
title_fullStr |
On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica |
title_full_unstemmed |
On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica |
title_sort |
on the paleo footprint of cape darnley bottom water off macrobertson land shelf, east antarctica |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/55771/ https://epic.awi.de/id/eprint/55771/2/2022NielsenandUenzelmannNeben.pdf https://doi.org/10.1016/j.margeo.2022.106735 https://hdl.handle.net/10013/epic.88f98ade-786c-4b6f-8fed-853712df698a https://hdl.handle.net/ |
long_lat |
ENVELOPE(69.567,69.567,-67.738,-67.738) ENVELOPE(69.717,69.717,-67.717,-67.717) ENVELOPE(65.000,65.000,-70.000,-70.000) ENVELOPE(67.000,67.000,-66.000,-66.000) |
geographic |
Antarctic Cape Darnley Darnley East Antarctica MacRobertson Land Prydz Bay The Antarctic Wild Canyon |
geographic_facet |
Antarctic Cape Darnley Darnley East Antarctica MacRobertson Land Prydz Bay The Antarctic Wild Canyon |
genre |
Antarc* Antarctic Antarctica East Antarctica MacRobertson Land Prydz Bay Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica MacRobertson Land Prydz Bay Sea ice |
op_source |
EPIC3Marine Geology, 445, pp. 106735, ISSN: 00253227 |
op_relation |
https://epic.awi.de/id/eprint/55771/2/2022NielsenandUenzelmannNeben.pdf https://hdl.handle.net/ Nielsen, R. orcid:0000-0002-1232-2950 and Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 (2022) On the paleo footprint of Cape Darnley Bottom Water off MacRobertson Land Shelf, East Antarctica , Marine Geology, 445 , p. 106735 . doi:10.1016/j.margeo.2022.106735 <https://doi.org/10.1016/j.margeo.2022.106735> , hdl:10013/epic.88f98ade-786c-4b6f-8fed-853712df698a |
op_doi |
https://doi.org/10.1016/j.margeo.2022.106735 |
container_title |
Marine Geology |
container_volume |
445 |
container_start_page |
106735 |
_version_ |
1766222759834157056 |