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Deglacial (12.8–10.7 ka) sea level history on the East Siberian continental\udshelf and upper continental slope was reconstructed using new geophysical records\udand sediment cores taken during Leg 2 of the 2014 SWERUS-C3 expedition. The\udfocus of this study is two cores from Herald Canyon, piston core\udSWERUS-L2-4-PC1 (4-PC1) and multicore SWERUS-L2-4-MC1 (4-MC1), and a gravity\udcore from an East Siberian Sea transect, SWERUS-L2-20-GC1 (20-GC1). Cores\ud4-PC1 and 20-GC were taken at 120 and 115 m of modern water depth,\udrespectively, only a few meters above the global last glacial maximum (LGM;\ud ∼  24 kiloannum or ka) minimum sea level of  ∼  125–130 meters below\udsea level (m b.s.l.). Using calibrated radiocarbon ages mainly on molluscs\udfor chronology and the ecology of benthic foraminifera and ostracode species\udto estimate paleodepths, the data reveal a dominance of river-proximal species\udduring the early part of the Younger Dryas event (YD, Greenland Stadial GS-1)\udfollowed by a rise in river-intermediate species in the late Younger Dryas or\udthe early Holocene (Preboreal) period. A rapid relative sea level rise\udbeginning at roughly 11.4 to 10.8 ka ( ∼  400 cm of core depth) is indicated\udby a sharp faunal change and unconformity or condensed zone of sedimentation.\udRegional sea level at this time was about 108 m b.s.l. at the 4-PC1 site\udand 102 m b.s.l. at 20-GC1. Regional sea level near the end of the YD was\udup to 42–47 m lower than predicted by geophysical models corrected\udfor glacio-isostatic adjustment. This discrepancy could be explained by\uddelayed isostatic adjustment caused by a greater volume and/or geographical\udextent of glacial-age land ice and/or ice shelves in the western Arctic Ocean\udand adjacent Siberian land areas

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