Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins

Thomas M. Cronin, Matt O'Regan, Christof Pearce, Laura Gemery, Michael Toomey, Igor Semiletov, Martin Jakobsson

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Deglacial (12.8-10.7ka) 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 115m 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 (mb.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 10.8ka (∼400cm 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 108mb.s.l. at the 4-PC1 site and 102mb.s.l. at 20-GC1. Regional sea level near the end of the YD was up to 42-47m 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.

Original languageEnglish
Pages (from-to)1097-1110
Number of pages14
JournalClimate of the Past
Volume13
Issue number9
DOIs
Publication statusPublished - 5 Sep 2017

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sea level
history
Younger Dryas
Preboreal
ice shelf
benthic foraminifera
ostracod
Last Glacial Maximum
continental slope
river
mollusc
unconformity
canyon
sediment core
chronology
continental shelf
water depth
transect
sea
Holocene

ASJC Scopus subject areas

  • Global and Planetary Change
  • Stratigraphy
  • Palaeontology

Cite this

Cronin, T. M., O'Regan, M., Pearce, C., Gemery, L., Toomey, M., Semiletov, I., & Jakobsson, M. (2017). Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins. Climate of the Past, 13(9), 1097-1110. https://doi.org/10.5194/cp-13-1097-2017

Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins. / Cronin, Thomas M.; O'Regan, Matt; Pearce, Christof; Gemery, Laura; Toomey, Michael; Semiletov, Igor; Jakobsson, Martin.

In: Climate of the Past, Vol. 13, No. 9, 05.09.2017, p. 1097-1110.

Research output: Contribution to journalArticle

Cronin, TM, O'Regan, M, Pearce, C, Gemery, L, Toomey, M, Semiletov, I & Jakobsson, M 2017, 'Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins', Climate of the Past, vol. 13, no. 9, pp. 1097-1110. https://doi.org/10.5194/cp-13-1097-2017
Cronin, Thomas M. ; O'Regan, Matt ; Pearce, Christof ; Gemery, Laura ; Toomey, Michael ; Semiletov, Igor ; Jakobsson, Martin. / Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins. In: Climate of the Past. 2017 ; Vol. 13, No. 9. pp. 1097-1110.
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