The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin
Ice sheets extending over parts of the East Siberian continental shelf have been proposed for the last glacial period and during the larger Pleistocene glaciations. The sparse data available over this sector of the Arctic Ocean have left the timing, extent and even existence of these ice sheets...
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2017-09-01
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doaj-18048da6cd334269b57a3bfc599e41922020-11-25T01:08:13ZengCopernicus PublicationsClimate of the Past1814-93241814-93322017-09-01131269128410.5194/cp-13-1269-2017The De Long Trough: a newly discovered glacial trough on the East Siberian continental marginM. O'Regan0M. O'Regan1J. Backman2J. Backman3N. Barrientos4N. Barrientos5T. M. Cronin6L. Gemery7N. Kirchner8N. Kirchner9L. A. Mayer10J. Nilsson11J. Nilsson12R. Noormets13C. Pearce14C. Pearce15C. Pearce16I. Semiletov17I. Semiletov18C. Stranne19C. Stranne20C. Stranne21M. Jakobsson22M. Jakobsson23Department of Geological Sciences, Stockholm University, 10691, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenDepartment of Geological Sciences, Stockholm University, 10691, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenDepartment of Geological Sciences, Stockholm University, 10691, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenUS Geological Survey MS926A, Reston, Virginia 20192, USAUS Geological Survey MS926A, Reston, Virginia 20192, USABolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenDepartment of Physical Geography (NG), Stockholm University, 10691, Stockholm, SwedenCenter for Coastal and Ocean Mapping, University of New Hampshire, Durham, New Hampshire 03824, USABolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenDepartment of Meteorology, Stockholm University, 10691, Stockholm, SwedenUniversity Centre in Svalbard (UNIS), P.O. Box 156, 9171, Longyearbyen, Svalbard, NorwayDepartment of Geological Sciences, Stockholm University, 10691, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenDepartment of Geoscience, Aarhus University, 8000, Aarhus, DenmarkPacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences, 690041, Vladivostok, RussiaTomsk National Research Polytechnic University, 634050, Tomsk, RussiaDepartment of Geological Sciences, Stockholm University, 10691, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenCenter for Coastal and Ocean Mapping, University of New Hampshire, Durham, New Hampshire 03824, USADepartment of Geological Sciences, Stockholm University, 10691, Stockholm, SwedenBolin Centre for Climate Research, Stockholm University, 10691, Stockholm, SwedenIce sheets extending over parts of the East Siberian continental shelf have been proposed for the last glacial period and during the larger Pleistocene glaciations. The sparse data available over this sector of the Arctic Ocean have left the timing, extent and even existence of these ice sheets largely unresolved. Here we present new geophysical mapping and sediment coring data from the East Siberian shelf and slope collected during the 2014 SWERUS-C3 expedition (SWERUS-C3: Swedish – Russian – US Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions). The multibeam bathymetry and chirp sub-bottom profiles reveal a set of glacial landforms that include grounding zone formations along the outer continental shelf, seaward of which lies a > 65 m thick sequence of glacio-genic debris flows. The glacial landforms are interpreted to lie at the seaward end of a glacial trough – the first to be reported on the East Siberian margin, here referred to as the De Long Trough because of its location due north of the De Long Islands. Stratigraphy and dating of sediment cores show that a drape of acoustically laminated sediments covering the glacial deposits is older than ∼ 50 cal kyr BP. This provides direct evidence for extensive glacial activity on the Siberian shelf that predates the Last Glacial Maximum and most likely occurred during the Saalian (Marine Isotope Stage (MIS) 6).https://www.clim-past.net/13/1269/2017/cp-13-1269-2017.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. O'Regan M. O'Regan J. Backman J. Backman N. Barrientos N. Barrientos T. M. Cronin L. Gemery N. Kirchner N. Kirchner L. A. Mayer J. Nilsson J. Nilsson R. Noormets C. Pearce C. Pearce C. Pearce I. Semiletov I. Semiletov C. Stranne C. Stranne C. Stranne M. Jakobsson M. Jakobsson |
spellingShingle |
M. O'Regan M. O'Regan J. Backman J. Backman N. Barrientos N. Barrientos T. M. Cronin L. Gemery N. Kirchner N. Kirchner L. A. Mayer J. Nilsson J. Nilsson R. Noormets C. Pearce C. Pearce C. Pearce I. Semiletov I. Semiletov C. Stranne C. Stranne C. Stranne M. Jakobsson M. Jakobsson The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin Climate of the Past |
author_facet |
M. O'Regan M. O'Regan J. Backman J. Backman N. Barrientos N. Barrientos T. M. Cronin L. Gemery N. Kirchner N. Kirchner L. A. Mayer J. Nilsson J. Nilsson R. Noormets C. Pearce C. Pearce C. Pearce I. Semiletov I. Semiletov C. Stranne C. Stranne C. Stranne M. Jakobsson M. Jakobsson |
author_sort |
M. O'Regan |
title |
The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin |
title_short |
The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin |
title_full |
The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin |
title_fullStr |
The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin |
title_full_unstemmed |
The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin |
title_sort |
de long trough: a newly discovered glacial trough on the east siberian continental margin |
publisher |
Copernicus Publications |
series |
Climate of the Past |
issn |
1814-9324 1814-9332 |
publishDate |
2017-09-01 |
description |
Ice sheets extending over parts of the East Siberian
continental shelf have been proposed for the last glacial period and during
the larger Pleistocene glaciations. The sparse data available over this
sector of the Arctic Ocean have left the timing, extent and even existence of
these ice sheets largely unresolved. Here we present new geophysical mapping
and sediment coring data from the East Siberian shelf and slope collected
during the 2014 SWERUS-C3 expedition (SWERUS-C3: Swedish – Russian – US
Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions). The
multibeam bathymetry and chirp sub-bottom profiles reveal a set of glacial
landforms that include grounding zone formations along the outer continental
shelf, seaward of which lies a > 65 m thick sequence of glacio-genic
debris flows. The glacial landforms are interpreted to lie at the seaward end
of a glacial trough – the first to be reported on the East Siberian margin,
here referred to as the De Long Trough because of its location due north of
the De Long Islands. Stratigraphy and dating of sediment cores show that a
drape of acoustically laminated sediments covering the glacial deposits is
older than ∼ 50 cal kyr BP. This provides direct
evidence for extensive glacial activity on the Siberian shelf that predates
the Last Glacial Maximum and most likely occurred during the Saalian (Marine
Isotope Stage (MIS) 6). |
url |
https://www.clim-past.net/13/1269/2017/cp-13-1269-2017.pdf |
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