Repeated Pleistocene glaciation of the East Siberian continental margin

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

“…Similar scour marks and, in places, glacial bedforms such as flutings and megascale glacial lineations have also been used to invoke the presence of extensive and thick ice sheets and ice shelves along the Chukchi Borderland (Jakobsson et al, 2005;Dove et al, 2014) and southern Mendeleev Ridge (Niessen et al, 2013), which require revisions of glacial Arctic ice cover . More localised ice shelves have also been hypothesised, often in association with ice streams (e.g.…”

“…Together with sub-bottom profiling and seismic investigations, geophysical techniques have the added advantage of being able to map seafloor morphology and changes in sediment thickness across large areas . The seaward extent of glacial till and sub-ice morphology has also been used to constrain the thickness of ice sheets at their marine margins (Polyak et al, 2001;Dowdeswell et al, 2010;Niessen et al, 2013).…”

Submarine glacial landform distribution in the central Arctic Ocean shelf–slope–basin system

“…Ottesen et al 2007;Hogan et al 2010;Andreassen et al 2014;. Notably, such morainic ridges also exist in the East Siberian and Chuckhi seas on the continental slope in water depths even greater than 500 m, away from crossshelf troughs and the shallow continental-shelf margin (Niessen et al 2013;Dove et al 2014; (Fig. 2a).…”

“…1a). Multibeam data show two sets of streamlined landforms on the plateau top (Niessen et al 2013), one suggesting ice flow almost directly from the East Siberian Sea continental margin and the other indicating flow along the long-axis of the Mendeleev Ridge. Subsequent mapping (SWERUS-C3 expedition) showed the MSGL-like landforms to extend to a water depth of about 1200 m. Those emanating from the East Siberian margin (white arrows in Fig.…”

PAST Gateways (Palaeo-Arctic Spatial and Temporal Gateways): Introduction and overview

“…Colleoni et al use numerical ice sheet modeling to test the hypothesis that an ice cap and an ice shelf could have grown over Beringia during the MIS 6 glaciation (140 kyrs BP) as suggested by marine geophysical investigations from the Arctic Ocean (e.g., Niessen et al, 2013). Results of the modeling experiment show that during MIS6 an ice cap develops over Beringia and connects to the Eurasian Ice Sheet resulting in a combined ice volume of 6e14 m SLE.…”