Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins
Deglacial (12.8–10.7 ka) sea level history on the East Siberian continental shelf and upper continental slope was reconstructed using new geophysical records and sediment cores taken during Leg 2 of the 2014 SWERUS-C3 expedition. The focus of this study is two cores from Herald Canyon, piston core S...
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Copernicus Publications
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Online Access: | https://doi.org/10.5194/cp-13-1097-2017 https://doaj.org/article/bbc2d891bff64903854c8bbdfc66a139 |
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ftdoajarticles:oai:doaj.org/article:bbc2d891bff64903854c8bbdfc66a139 2023-05-15T15:16:45+02:00 Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins T. M. Cronin M. O'Regan C. Pearce L. Gemery M. Toomey I. Semiletov M. Jakobsson 2017-09-01T00:00:00Z https://doi.org/10.5194/cp-13-1097-2017 https://doaj.org/article/bbc2d891bff64903854c8bbdfc66a139 EN eng Copernicus Publications https://www.clim-past.net/13/1097/2017/cp-13-1097-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-1097-2017 1814-9324 1814-9332 https://doaj.org/article/bbc2d891bff64903854c8bbdfc66a139 Climate of the Past, Vol 13, Pp 1097-1110 (2017) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/cp-13-1097-2017 2022-12-31T03:05:39Z Deglacial (12.8–10.7 ka) sea level history on the East Siberian continental shelf and upper continental slope was reconstructed using new geophysical records and sediment cores taken during Leg 2 of the 2014 SWERUS-C3 expedition. The focus of this study is two cores from Herald Canyon, piston core SWERUS-L2-4-PC1 (4-PC1) and multicore SWERUS-L2-4-MC1 (4-MC1), and a gravity core from an East Siberian Sea transect, SWERUS-L2-20-GC1 (20-GC1). Cores 4-PC1 and 20-GC were taken at 120 and 115 m of modern water depth, respectively, only a few meters above the global last glacial maximum (LGM; ∼ 24 kiloannum or ka) minimum sea level of ∼ 125–130 meters below sea level (m b.s.l.). Using calibrated radiocarbon ages mainly on molluscs for chronology and the ecology of benthic foraminifera and ostracode species to estimate paleodepths, the data reveal a dominance of river-proximal species during the early part of the Younger Dryas event (YD, Greenland Stadial GS-1) followed by a rise in river-intermediate species in the late Younger Dryas or the early Holocene (Preboreal) period. A rapid relative sea level rise beginning at roughly 11.4 to 10.8 ka ( ∼ 400 cm of core depth) is indicated by a sharp faunal change and unconformity or condensed zone of sedimentation. Regional sea level at this time was about 108 m b.s.l. at the 4-PC1 site and 102 m b.s.l. at 20-GC1. Regional sea level near the end of the YD was up to 42–47 m lower than predicted by geophysical models corrected for glacio-isostatic adjustment. This discrepancy could be explained by delayed isostatic adjustment caused by a greater volume and/or geographical extent of glacial-age land ice and/or ice shelves in the western Arctic Ocean and adjacent Siberian land areas. Article in Journal/Newspaper Arctic Arctic Ocean Chukchi Chukchi Sea East Siberian Sea Foraminifera* Greenland Ice Shelves SWERUS-C3 Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Chukchi Sea Greenland East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Climate of the Past 13 9 1097 1110 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 T. M. Cronin M. O'Regan C. Pearce L. Gemery M. Toomey I. Semiletov M. Jakobsson Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Deglacial (12.8–10.7 ka) sea level history on the East Siberian continental shelf and upper continental slope was reconstructed using new geophysical records and sediment cores taken during Leg 2 of the 2014 SWERUS-C3 expedition. The focus of this study is two cores from Herald Canyon, piston core SWERUS-L2-4-PC1 (4-PC1) and multicore SWERUS-L2-4-MC1 (4-MC1), and a gravity core from an East Siberian Sea transect, SWERUS-L2-20-GC1 (20-GC1). Cores 4-PC1 and 20-GC were taken at 120 and 115 m of modern water depth, respectively, only a few meters above the global last glacial maximum (LGM; ∼ 24 kiloannum or ka) minimum sea level of ∼ 125–130 meters below sea level (m b.s.l.). Using calibrated radiocarbon ages mainly on molluscs for chronology and the ecology of benthic foraminifera and ostracode species to estimate paleodepths, the data reveal a dominance of river-proximal species during the early part of the Younger Dryas event (YD, Greenland Stadial GS-1) followed by a rise in river-intermediate species in the late Younger Dryas or the early Holocene (Preboreal) period. A rapid relative sea level rise beginning at roughly 11.4 to 10.8 ka ( ∼ 400 cm of core depth) is indicated by a sharp faunal change and unconformity or condensed zone of sedimentation. Regional sea level at this time was about 108 m b.s.l. at the 4-PC1 site and 102 m b.s.l. at 20-GC1. Regional sea level near the end of the YD was up to 42–47 m lower than predicted by geophysical models corrected for glacio-isostatic adjustment. This discrepancy could be explained by delayed isostatic adjustment caused by a greater volume and/or geographical extent of glacial-age land ice and/or ice shelves in the western Arctic Ocean and adjacent Siberian land areas. |
format |
Article in Journal/Newspaper |
author |
T. M. Cronin M. O'Regan C. Pearce L. Gemery M. Toomey I. Semiletov M. Jakobsson |
author_facet |
T. M. Cronin M. O'Regan C. Pearce L. Gemery M. Toomey I. Semiletov M. Jakobsson |
author_sort |
T. M. Cronin |
title |
Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins |
title_short |
Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins |
title_full |
Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins |
title_fullStr |
Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins |
title_full_unstemmed |
Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins |
title_sort |
deglacial sea level history of the east siberian sea and chukchi sea margins |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-1097-2017 https://doaj.org/article/bbc2d891bff64903854c8bbdfc66a139 |
long_lat |
ENVELOPE(166.000,166.000,74.000,74.000) |
geographic |
Arctic Arctic Ocean Chukchi Sea Greenland East Siberian Sea |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Greenland East Siberian Sea |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea East Siberian Sea Foraminifera* Greenland Ice Shelves SWERUS-C3 |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea East Siberian Sea Foraminifera* Greenland Ice Shelves SWERUS-C3 |
op_source |
Climate of the Past, Vol 13, Pp 1097-1110 (2017) |
op_relation |
https://www.clim-past.net/13/1097/2017/cp-13-1097-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-1097-2017 1814-9324 1814-9332 https://doaj.org/article/bbc2d891bff64903854c8bbdfc66a139 |
op_doi |
https://doi.org/10.5194/cp-13-1097-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
9 |
container_start_page |
1097 |
op_container_end_page |
1110 |
_version_ |
1766347050610327552 |