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 cor...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-09-01
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| Series: | Climate of the Past |
| Online Access: | https://www.clim-past.net/13/1097/2017/cp-13-1097-2017.pdf |
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| author | T. M. Cronin M. O'Regan C. Pearce L. Gemery M. Toomey I. Semiletov I. Semiletov M. Jakobsson |
| author_facet | T. M. Cronin M. O'Regan C. Pearce L. Gemery M. Toomey I. Semiletov I. Semiletov M. Jakobsson |
| author_sort | T. M. Cronin |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-12T13:58:50Z |
| format | Article |
| id | doaj.art-bbc2d891bff64903854c8bbdfc66a139 |
| institution | Directory Open Access Journal |
| issn | 1814-9324 1814-9332 |
| language | English |
| last_indexed | 2024-12-12T13:58:50Z |
| publishDate | 2017-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Climate of the Past |
| spelling | doaj.art-bbc2d891bff64903854c8bbdfc66a1392022-12-22T00:22:23ZengCopernicus PublicationsClimate of the Past1814-93241814-93322017-09-01131097111010.5194/cp-13-1097-2017Deglacial sea level history of the East Siberian Sea and Chukchi Sea marginsT. M. Cronin0M. O'Regan1C. Pearce2L. Gemery3M. Toomey4I. Semiletov5I. Semiletov6M. Jakobsson7US Geological Survey MS 926A, Reston, Virginia 20192, USADepartment of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, SwedenDepartment of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, SwedenUS Geological Survey MS 926A, Reston, Virginia 20192, USAUS Geological Survey MS 926A, Reston, Virginia 20192, USAPacific Oceanological Institute, Russian Academy Sciences, Vladivostok, RussiaTomsk Polytechnic University, Tomsk, RussiaDepartment of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, 10691 Stockholm, SwedenDeglacial (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.https://www.clim-past.net/13/1097/2017/cp-13-1097-2017.pdf |
| spellingShingle | T. M. Cronin M. O'Regan C. Pearce L. Gemery M. Toomey I. Semiletov I. Semiletov M. Jakobsson Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins Climate of the Past |
| title | 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_short | 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 |
| url | https://www.clim-past.net/13/1097/2017/cp-13-1097-2017.pdf |
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