Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-19
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
29 Mar 2017
Review status
A revision of this discussion paper is under review for the journal Climate of the Past (CP).
Deglacial sea-level history of the East Siberian Sea Margin
Thomas M. Cronin1, Matt O'Regan2, Christof Pearce2, Laura Gemery1, Michael Toomey1, Igor Semiletov3,4, and Martin Jakobsson2 1US Geological Survey MS926A, Reston, Virginia, 20192, USA
2Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden
3Pacific Oceanological Institute, Russian Academy Sciences, Vladivostok, Russia
4Tomsk National Research Polytechnic University, Tomsk, Russia
Abstract. Abstract. Deglacial (12.8–10.7 ka) sea-level history on the East Siberian continental shelf/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-PC) and multicore SWERUS-L2-4-MC1 (4-MC1) and a gravity core from an East Siberian Sea Transect, SWERUS-L2-20-GC1 (20-GC). Cores 4-PC1 and 20-GC were taken at 120 m and 115 m modern water depth, respectively, only a few meters above the global last glacial maximum (LGM, ~ 24 kiloannum (ka)) minimum sea level of ~ 125–130 meters below sea level (mbsl). Using calibrated radiocarbon ages mainly on molluscs for chronology and the ecology of benthic foraminifera and ostracode species to estimate paleo-depths, the data reveal 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 roughly 11.4 to 10.8 ka (~ 400 cm core depth) during is indicated by a sharp faunal change and unconformity or condensed zone of sedimentation. Regional sea level at this time was about 108 mbsl at the 4-PC1 site and 102 mbsl at 20-GC. Regional sea-level during the YD was about 40 to 50 meters lower than those 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.

Citation: Cronin, T. M., O'Regan, M., Pearce, C., Gemery, L., Toomey, M., Semiletov, I., and Jakobsson, M.: Deglacial sea-level history of the East Siberian Sea Margin, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-19, in review, 2017.
Thomas M. Cronin et al.
Thomas M. Cronin et al.
Thomas M. Cronin et al.

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Short summary
Global sea-level rise following the last glacial period flooded the Siberian continental shelf in the Arctic Ocean. Evidence from sediment cores, radiocarbon dating and microfossil assemblages shows that regional sea level in the Arctic rose rapidly from about 12 800 to 10 700 years ago. The difference between regional sea-level history on the Siberian shelf and the global deglacial sea-level rise is likely due to regional vertical adjustment due to growth and decay of ice sheets and ice sheet.
Global sea-level rise following the last glacial period flooded the Siberian continental shelf...
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