Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago
Rapidly-flowing sectors of an ice sheet (ice streams) can play ail important role in abrupt climate change through tile delivery of icebergs and meltwater and tile Subsequent disruption of ocean thermohaline circulation (e.g., the North Atlantic's Heinrich events). Recently, several cores have...
Published in: | Global and Planetary Change |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2005
|
Subjects: | |
Online Access: | https://centaur.reading.ac.uk/4130/ |
id |
ftunivreading:oai:centaur.reading.ac.uk:4130 |
---|---|
record_format |
openpolar |
spelling |
ftunivreading:oai:centaur.reading.ac.uk:4130 2024-06-23T07:48:21+00:00 Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago Stokes, C. R. Clark, C. D. Darby, D. A. Hodgson, D. A. 2005 https://centaur.reading.ac.uk/4130/ unknown Stokes, C. R., Clark, C. D., Darby, D. A. and Hodgson, D. A. (2005) Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago. Global and Planetary Change, 49 (3-4). pp. 139-162. ISSN 0921-8181 doi: https://doi.org/10.1016/j.gloplacha.2005.06.001 <https://doi.org/10.1016/j.gloplacha.2005.06.001> Article NonPeerReviewed 2005 ftunivreading https://doi.org/10.1016/j.gloplacha.2005.06.001 2024-06-11T14:41:45Z Rapidly-flowing sectors of an ice sheet (ice streams) can play ail important role in abrupt climate change through tile delivery of icebergs and meltwater and tile Subsequent disruption of ocean thermohaline circulation (e.g., the North Atlantic's Heinrich events). Recently, several cores have been raised from the Arctic Ocean which document the existence of massive ice export events during tile Late Pleistocene and whose provenance has been linked to Source regions in the Canadian Arctic Archipelago. In this paper, satellite imagery is used to map glacial geomorphology in the vicinity of Victoria Island, Banks Island and Prince of Wales Island (Canadian Arctic) in order to reconstruct ice flow patterns in the highly complex glacial landscape. A total of 88 discrete flow-sets are mapped and of these, 13 exhibit the characteristic geomorphology of palaeo-ice streams (i.e., parallel patterns of large, highly elongated mega-scale glacial lineations forming a convergent flow pattern with abrupt lateral margins). Previous studies by other workers and cross-cutting relationships indicate that the majority of these ice streams are relatively young and operated during or immediately prior to deglaciation. Our new mapping, however, documents a large (> 700 km long; 110 km wide) and relatively old ice stream imprint centred in M'Clintock Channel and converging into Viscount Melville Sound. A trough mouth fan located on the continental shelf Suggests that it extended along M'Clure Strait and was grounded at tile shelf edge. The location of the M'Clure Strait Ice Stream exactly matches the Source area of 4 (possibly 5) major ice export events recorded in core PS 1230 raised from Fram Strait, the major ice exit for the Arctic Ocean. These ice export events occur at similar to 12.9, similar to 15.6, similar to 22 and 29.8 ka (C-14 yr BP) and we argue that they record vigorous episodes of activity of the M'Clure Strait Ice Stream. The timing of these events is remarkably similar to the North Atlantic's Heinrich events and ... Article in Journal/Newspaper Arctic Arctic Archipelago Arctic Arctic Ocean Banks Island Canadian Arctic Archipelago Climate change Fram Strait Ice Sheet Iceberg* M'Clure Strait Prince of Wales Island Victoria Island Viscount Melville Sound CentAUR: Central Archive at the University of Reading Arctic Arctic Ocean Canadian Arctic Archipelago M'Clintock ENVELOPE(-94.214,-94.214,57.802,57.802) M'Clintock Channel ENVELOPE(-102.002,-102.002,72.001,72.001) M'Clure Strait ENVELOPE(-115.999,-115.999,74.498,74.498) Melville Sound ENVELOPE(-107.002,-107.002,68.168,68.168) Prince of Wales Island ENVELOPE(-99.001,-99.001,72.668,72.668) Viscount Melville Sound ENVELOPE(-109.836,-109.836,74.046,74.046) Global and Planetary Change 49 3-4 139 162 |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
unknown |
description |
Rapidly-flowing sectors of an ice sheet (ice streams) can play ail important role in abrupt climate change through tile delivery of icebergs and meltwater and tile Subsequent disruption of ocean thermohaline circulation (e.g., the North Atlantic's Heinrich events). Recently, several cores have been raised from the Arctic Ocean which document the existence of massive ice export events during tile Late Pleistocene and whose provenance has been linked to Source regions in the Canadian Arctic Archipelago. In this paper, satellite imagery is used to map glacial geomorphology in the vicinity of Victoria Island, Banks Island and Prince of Wales Island (Canadian Arctic) in order to reconstruct ice flow patterns in the highly complex glacial landscape. A total of 88 discrete flow-sets are mapped and of these, 13 exhibit the characteristic geomorphology of palaeo-ice streams (i.e., parallel patterns of large, highly elongated mega-scale glacial lineations forming a convergent flow pattern with abrupt lateral margins). Previous studies by other workers and cross-cutting relationships indicate that the majority of these ice streams are relatively young and operated during or immediately prior to deglaciation. Our new mapping, however, documents a large (> 700 km long; 110 km wide) and relatively old ice stream imprint centred in M'Clintock Channel and converging into Viscount Melville Sound. A trough mouth fan located on the continental shelf Suggests that it extended along M'Clure Strait and was grounded at tile shelf edge. The location of the M'Clure Strait Ice Stream exactly matches the Source area of 4 (possibly 5) major ice export events recorded in core PS 1230 raised from Fram Strait, the major ice exit for the Arctic Ocean. These ice export events occur at similar to 12.9, similar to 15.6, similar to 22 and 29.8 ka (C-14 yr BP) and we argue that they record vigorous episodes of activity of the M'Clure Strait Ice Stream. The timing of these events is remarkably similar to the North Atlantic's Heinrich events and ... |
format |
Article in Journal/Newspaper |
author |
Stokes, C. R. Clark, C. D. Darby, D. A. Hodgson, D. A. |
spellingShingle |
Stokes, C. R. Clark, C. D. Darby, D. A. Hodgson, D. A. Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago |
author_facet |
Stokes, C. R. Clark, C. D. Darby, D. A. Hodgson, D. A. |
author_sort |
Stokes, C. R. |
title |
Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago |
title_short |
Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago |
title_full |
Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago |
title_fullStr |
Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago |
title_full_unstemmed |
Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago |
title_sort |
late pleistocene ice export events into the arctic ocean from the m'clure strait ice stream, canadian arctic archipelago |
publishDate |
2005 |
url |
https://centaur.reading.ac.uk/4130/ |
long_lat |
ENVELOPE(-94.214,-94.214,57.802,57.802) ENVELOPE(-102.002,-102.002,72.001,72.001) ENVELOPE(-115.999,-115.999,74.498,74.498) ENVELOPE(-107.002,-107.002,68.168,68.168) ENVELOPE(-99.001,-99.001,72.668,72.668) ENVELOPE(-109.836,-109.836,74.046,74.046) |
geographic |
Arctic Arctic Ocean Canadian Arctic Archipelago M'Clintock M'Clintock Channel M'Clure Strait Melville Sound Prince of Wales Island Viscount Melville Sound |
geographic_facet |
Arctic Arctic Ocean Canadian Arctic Archipelago M'Clintock M'Clintock Channel M'Clure Strait Melville Sound Prince of Wales Island Viscount Melville Sound |
genre |
Arctic Arctic Archipelago Arctic Arctic Ocean Banks Island Canadian Arctic Archipelago Climate change Fram Strait Ice Sheet Iceberg* M'Clure Strait Prince of Wales Island Victoria Island Viscount Melville Sound |
genre_facet |
Arctic Arctic Archipelago Arctic Arctic Ocean Banks Island Canadian Arctic Archipelago Climate change Fram Strait Ice Sheet Iceberg* M'Clure Strait Prince of Wales Island Victoria Island Viscount Melville Sound |
op_relation |
Stokes, C. R., Clark, C. D., Darby, D. A. and Hodgson, D. A. (2005) Late pleistocene ice export events into the Arctic Ocean from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago. Global and Planetary Change, 49 (3-4). pp. 139-162. ISSN 0921-8181 doi: https://doi.org/10.1016/j.gloplacha.2005.06.001 <https://doi.org/10.1016/j.gloplacha.2005.06.001> |
op_doi |
https://doi.org/10.1016/j.gloplacha.2005.06.001 |
container_title |
Global and Planetary Change |
container_volume |
49 |
container_issue |
3-4 |
container_start_page |
139 |
op_container_end_page |
162 |
_version_ |
1802638767797829632 |