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 larg...
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ftdoajarticles:oai:doaj.org/article:18048da6cd334269b57a3bfc599e4192 2023-05-15T14:59:22+02:00 The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin M. O'Regan J. Backman N. Barrientos T. M. Cronin L. Gemery N. Kirchner L. A. Mayer J. Nilsson R. Noormets C. Pearce I. Semiletov C. Stranne M. Jakobsson 2017-09-01T00:00:00Z https://doi.org/10.5194/cp-13-1269-2017 https://doaj.org/article/18048da6cd334269b57a3bfc599e4192 EN eng Copernicus Publications https://www.clim-past.net/13/1269/2017/cp-13-1269-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-1269-2017 1814-9324 1814-9332 https://doaj.org/article/18048da6cd334269b57a3bfc599e4192 Climate of the Past, Vol 13, Pp 1269-1284 (2017) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/cp-13-1269-2017 2022-12-31T04:18:01Z 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). Article in Journal/Newspaper Arctic Arctic Ocean De Long Islands SWERUS-C3 Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean East Siberian Shelf ENVELOPE(-162.267,-162.267,74.400,74.400) De Long Islands ENVELOPE(153.000,153.000,76.500,76.500) Long Islands ENVELOPE(-93.035,-93.035,56.912,56.912) Climate of the Past 13 9 1269 1284 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. O'Regan J. Backman N. Barrientos T. M. Cronin L. Gemery N. Kirchner L. A. Mayer J. Nilsson R. Noormets C. Pearce I. Semiletov C. Stranne M. Jakobsson The De Long Trough: a newly discovered glacial trough on the East Siberian continental margin |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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). |
format |
Article in Journal/Newspaper |
author |
M. O'Regan J. Backman N. Barrientos T. M. Cronin L. Gemery N. Kirchner L. A. Mayer J. Nilsson R. Noormets C. Pearce I. Semiletov C. Stranne M. Jakobsson |
author_facet |
M. O'Regan J. Backman N. Barrientos T. M. Cronin L. Gemery N. Kirchner L. A. Mayer J. Nilsson R. Noormets C. Pearce I. Semiletov C. Stranne 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 |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-1269-2017 https://doaj.org/article/18048da6cd334269b57a3bfc599e4192 |
long_lat |
ENVELOPE(-162.267,-162.267,74.400,74.400) ENVELOPE(153.000,153.000,76.500,76.500) ENVELOPE(-93.035,-93.035,56.912,56.912) |
geographic |
Arctic Arctic Ocean East Siberian Shelf De Long Islands Long Islands |
geographic_facet |
Arctic Arctic Ocean East Siberian Shelf De Long Islands Long Islands |
genre |
Arctic Arctic Ocean De Long Islands SWERUS-C3 |
genre_facet |
Arctic Arctic Ocean De Long Islands SWERUS-C3 |
op_source |
Climate of the Past, Vol 13, Pp 1269-1284 (2017) |
op_relation |
https://www.clim-past.net/13/1269/2017/cp-13-1269-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-1269-2017 1814-9324 1814-9332 https://doaj.org/article/18048da6cd334269b57a3bfc599e4192 |
op_doi |
https://doi.org/10.5194/cp-13-1269-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
9 |
container_start_page |
1269 |
op_container_end_page |
1284 |
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1766331469297352704 |