Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum
The continental margin of the Ross Sea has been consistently sensitive to the advance and retreat of the Ross Ice Sheet (RIS) between the interglacial and glacial periods. This study examines changes of the glaciomarine sedimentation on the continental slope and rise to the eastern side of Hillary C...
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Online Access: | http://hdl.handle.net/11368/3017404 https://doi.org/10.1016/j.margeo.2022.106752 |
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ftunitriestiris:oai:arts.units.it:11368/3017404 2023-05-15T14:07:50+02:00 Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum Ha S. Colizza E. Torricella F. Langone L. Giglio F. Kuhn G. Macri P. Khim B. -K. Ha, S. Colizza, E. Torricella, F. Langone, L. Giglio, F. Kuhn, G. Macri, P. Khim, B. -K. 2022 ELETTRONICO http://hdl.handle.net/11368/3017404 https://doi.org/10.1016/j.margeo.2022.106752 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000776074400001 volume:445 firstpage:"-". lastpage:"-". numberofpages:15 journal:MARINE GEOLOGY http://hdl.handle.net/11368/3017404 doi:10.1016/j.margeo.2022.106752 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85125473653 Continental margin Ice sheet Paleoproductivity Ross Sea Sea ice Sediment core info:eu-repo/semantics/article 2022 ftunitriestiris https://doi.org/10.1016/j.margeo.2022.106752 2023-04-09T06:21:23Z The continental margin of the Ross Sea has been consistently sensitive to the advance and retreat of the Ross Ice Sheet (RIS) between the interglacial and glacial periods. This study examines changes of the glaciomarine sedimentation on the continental slope and rise to the eastern side of Hillary Canyon in the central Ross Sea, using three gravity cores collected at increasing water depths. Besides older AMS 14C ages of bulk sediments, based on the analytical results, sediment lithology was divided into units A, B1, and B2, representing Holocene, deglacial, and glacial periods, respectively. The sedimentation rate decreased as the water depth increased, with a higher sedimentation rate in the deglacial period (unit B1) than the Holocene (unit A). Biological productivity proxies were significantly higher in glacial unit B2 than in interglacial unit A, with transitional values observed in deglacial unit B1. Biological productivity generally decreased in the Antarctic continental margin during the glacial period because of extensive sea ice coverage. The higher biogenic contents in unit B2 are primarily attributed to the increased transport of eroded and reworked shelf sediments that contained abundant biogenic components to the continental slope and rise beneath the advancing RIS. Thus, glacial sedimentation on the continental slope and rise of the central Ross Sea was generally governed by the activity of the RIS, which generated melt-water plumes and debris flows at the front of the grounding line, although the continental rise might have experienced seasonally open conditions and lateral effects due to the bottom current. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ross Sea Sea ice Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) Antarctic Hillary Canyon ENVELOPE(-175.762,-175.762,-74.544,-74.544) Ross Sea The Antarctic Marine Geology 445 106752 |
institution |
Open Polar |
collection |
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) |
op_collection_id |
ftunitriestiris |
language |
English |
topic |
Continental margin Ice sheet Paleoproductivity Ross Sea Sea ice Sediment core |
spellingShingle |
Continental margin Ice sheet Paleoproductivity Ross Sea Sea ice Sediment core Ha S. Colizza E. Torricella F. Langone L. Giglio F. Kuhn G. Macri P. Khim B. -K. Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum |
topic_facet |
Continental margin Ice sheet Paleoproductivity Ross Sea Sea ice Sediment core |
description |
The continental margin of the Ross Sea has been consistently sensitive to the advance and retreat of the Ross Ice Sheet (RIS) between the interglacial and glacial periods. This study examines changes of the glaciomarine sedimentation on the continental slope and rise to the eastern side of Hillary Canyon in the central Ross Sea, using three gravity cores collected at increasing water depths. Besides older AMS 14C ages of bulk sediments, based on the analytical results, sediment lithology was divided into units A, B1, and B2, representing Holocene, deglacial, and glacial periods, respectively. The sedimentation rate decreased as the water depth increased, with a higher sedimentation rate in the deglacial period (unit B1) than the Holocene (unit A). Biological productivity proxies were significantly higher in glacial unit B2 than in interglacial unit A, with transitional values observed in deglacial unit B1. Biological productivity generally decreased in the Antarctic continental margin during the glacial period because of extensive sea ice coverage. The higher biogenic contents in unit B2 are primarily attributed to the increased transport of eroded and reworked shelf sediments that contained abundant biogenic components to the continental slope and rise beneath the advancing RIS. Thus, glacial sedimentation on the continental slope and rise of the central Ross Sea was generally governed by the activity of the RIS, which generated melt-water plumes and debris flows at the front of the grounding line, although the continental rise might have experienced seasonally open conditions and lateral effects due to the bottom current. |
author2 |
Ha, S. Colizza, E. Torricella, F. Langone, L. Giglio, F. Kuhn, G. Macri, P. Khim, B. -K. |
format |
Article in Journal/Newspaper |
author |
Ha S. Colizza E. Torricella F. Langone L. Giglio F. Kuhn G. Macri P. Khim B. -K. |
author_facet |
Ha S. Colizza E. Torricella F. Langone L. Giglio F. Kuhn G. Macri P. Khim B. -K. |
author_sort |
Ha S. |
title |
Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum |
title_short |
Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum |
title_full |
Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum |
title_fullStr |
Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum |
title_full_unstemmed |
Glaciomarine sediment deposition on the continental slope and rise of the central Ross Sea since the Last Glacial Maximum |
title_sort |
glaciomarine sediment deposition on the continental slope and rise of the central ross sea since the last glacial maximum |
publishDate |
2022 |
url |
http://hdl.handle.net/11368/3017404 https://doi.org/10.1016/j.margeo.2022.106752 |
long_lat |
ENVELOPE(-175.762,-175.762,-74.544,-74.544) |
geographic |
Antarctic Hillary Canyon Ross Sea The Antarctic |
geographic_facet |
Antarctic Hillary Canyon Ross Sea The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet Ross Sea Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000776074400001 volume:445 firstpage:"-". lastpage:"-". numberofpages:15 journal:MARINE GEOLOGY http://hdl.handle.net/11368/3017404 doi:10.1016/j.margeo.2022.106752 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85125473653 |
op_doi |
https://doi.org/10.1016/j.margeo.2022.106752 |
container_title |
Marine Geology |
container_volume |
445 |
container_start_page |
106752 |
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1766279857862344704 |