Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels
Multiple proxies in three sediment cores from Northwestern Baffin Bay document the timing of Lancaster Sound Ice Stream (LSIS) retreat that led to Arctic–Atlantic throughflow in Parry Channel, an important source of freshwater that can impact the Atlantic Meridional Overturning Circulation. The Late...
Published in: | Arctic, Antarctic, and Alpine Research |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Taylor & Francis Group
2022
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Online Access: | https://doi.org/10.1080/15230430.2022.2110689 https://doaj.org/article/9dc8f16a3d92400fac7fb36010e763b1 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:9dc8f16a3d92400fac7fb36010e763b1 2023-05-15T14:14:21+02:00 Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels Robert Kelleher Anne Jennings John Andrews Nicole K. S. Brooks Tom Marchitto Shaoting Feng Lineke Woelders Alexandre Normandeau Kimberley Jenner Robbie Bennett Sarah Brookins 2022-12-01 https://doi.org/10.1080/15230430.2022.2110689 https://doaj.org/article/9dc8f16a3d92400fac7fb36010e763b1 en eng Taylor & Francis Group doi:10.1080/15230430.2022.2110689 1938-4246 1523-0430 https://doaj.org/article/9dc8f16a3d92400fac7fb36010e763b1 undefined Arctic, Antarctic, and Alpine Research, Vol 54, Iss 1, Pp 395-427 (2022) Deglaciation Parry Channel BBDC events Baffin Bay foraminifera geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.1080/15230430.2022.2110689 2023-01-22T19:33:25Z Multiple proxies in three sediment cores from Northwestern Baffin Bay document the timing of Lancaster Sound Ice Stream (LSIS) retreat that led to Arctic–Atlantic throughflow in Parry Channel, an important source of freshwater that can impact the Atlantic Meridional Overturning Circulation. The Late Glacial to Holocene timing of ice retreat and channel opening and the responses of the regional ocean environment to these events are presented. We use quantitative mineral composition, foraminiferal assemblages, biogenic silica, ice-rafted debris (IRD), and 14C-based age models to document and date the events and environmental changes occurring during deglaciation of this major marine channel. Findings show that retreat of the LSIS into Lancaster Sound occurred before ~15.3 cal ka BP, about 800 years before the onset of major iceberg calving events from the LSIS, named the Baffin Bay Detrital Carbonate events (BBDC 1 and BBDC 0). The end of BBDC 0 occurred at ~10.6 cal ka BP, which coincides with the opening of Parry Channel. A marine environment productive of calcareous benthic and planktic foraminifera, with diminished meltwater, seasonal sea ice, warmer summer temperatures, and inflowing, nutrient-rich Arctic surface water characterizes the interval between the opening of Parry Channel and the opening of Nares Strait. Paired planktic and benthic 14C ages over this 2,200-year interval show diminishing age offsets suggesting progressive mixing of the upper ~850–900 m of the water column. The opening of Nares Strait by ~8.2 cal ka BP coincides with increased biogenic silica in the form of abundant, large centric diatoms and dissolution of CaCO3. The paucity of calcareous organisms after 8.2 cal ka BP resulted in poor chronological control in the cores to interpret changing environments after 8.2 cal ka BP. Article in Journal/Newspaper Antarctic and Alpine Research Arctic Arctic Baffin Bay Baffin Bay Baffin Foraminifera* Iceberg* Lancaster Sound Nares strait Parry Channel Sea ice Unknown Arctic Arctic Island ENVELOPE(-74.766,-74.766,62.234,62.234) Baffin Bay Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Parry ENVELOPE(-62.417,-62.417,-64.283,-64.283) Arctic, Antarctic, and Alpine Research 54 1 395 427 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Deglaciation Parry Channel BBDC events Baffin Bay foraminifera geo envir |
spellingShingle |
Deglaciation Parry Channel BBDC events Baffin Bay foraminifera geo envir Robert Kelleher Anne Jennings John Andrews Nicole K. S. Brooks Tom Marchitto Shaoting Feng Lineke Woelders Alexandre Normandeau Kimberley Jenner Robbie Bennett Sarah Brookins Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels |
topic_facet |
Deglaciation Parry Channel BBDC events Baffin Bay foraminifera geo envir |
description |
Multiple proxies in three sediment cores from Northwestern Baffin Bay document the timing of Lancaster Sound Ice Stream (LSIS) retreat that led to Arctic–Atlantic throughflow in Parry Channel, an important source of freshwater that can impact the Atlantic Meridional Overturning Circulation. The Late Glacial to Holocene timing of ice retreat and channel opening and the responses of the regional ocean environment to these events are presented. We use quantitative mineral composition, foraminiferal assemblages, biogenic silica, ice-rafted debris (IRD), and 14C-based age models to document and date the events and environmental changes occurring during deglaciation of this major marine channel. Findings show that retreat of the LSIS into Lancaster Sound occurred before ~15.3 cal ka BP, about 800 years before the onset of major iceberg calving events from the LSIS, named the Baffin Bay Detrital Carbonate events (BBDC 1 and BBDC 0). The end of BBDC 0 occurred at ~10.6 cal ka BP, which coincides with the opening of Parry Channel. A marine environment productive of calcareous benthic and planktic foraminifera, with diminished meltwater, seasonal sea ice, warmer summer temperatures, and inflowing, nutrient-rich Arctic surface water characterizes the interval between the opening of Parry Channel and the opening of Nares Strait. Paired planktic and benthic 14C ages over this 2,200-year interval show diminishing age offsets suggesting progressive mixing of the upper ~850–900 m of the water column. The opening of Nares Strait by ~8.2 cal ka BP coincides with increased biogenic silica in the form of abundant, large centric diatoms and dissolution of CaCO3. The paucity of calcareous organisms after 8.2 cal ka BP resulted in poor chronological control in the cores to interpret changing environments after 8.2 cal ka BP. |
format |
Article in Journal/Newspaper |
author |
Robert Kelleher Anne Jennings John Andrews Nicole K. S. Brooks Tom Marchitto Shaoting Feng Lineke Woelders Alexandre Normandeau Kimberley Jenner Robbie Bennett Sarah Brookins |
author_facet |
Robert Kelleher Anne Jennings John Andrews Nicole K. S. Brooks Tom Marchitto Shaoting Feng Lineke Woelders Alexandre Normandeau Kimberley Jenner Robbie Bennett Sarah Brookins |
author_sort |
Robert Kelleher |
title |
Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels |
title_short |
Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels |
title_full |
Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels |
title_fullStr |
Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels |
title_full_unstemmed |
Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels |
title_sort |
late glacial retreat of the lancaster sound ice stream and early holocene onset of arctic/atlantic throughflow in the arctic island channels |
publisher |
Taylor & Francis Group |
publishDate |
2022 |
url |
https://doi.org/10.1080/15230430.2022.2110689 https://doaj.org/article/9dc8f16a3d92400fac7fb36010e763b1 |
long_lat |
ENVELOPE(-74.766,-74.766,62.234,62.234) ENVELOPE(-83.999,-83.999,74.218,74.218) ENVELOPE(158.167,158.167,-81.450,-81.450) ENVELOPE(-62.417,-62.417,-64.283,-64.283) |
geographic |
Arctic Arctic Island Baffin Bay Lancaster Sound Nares Parry |
geographic_facet |
Arctic Arctic Island Baffin Bay Lancaster Sound Nares Parry |
genre |
Antarctic and Alpine Research Arctic Arctic Baffin Bay Baffin Bay Baffin Foraminifera* Iceberg* Lancaster Sound Nares strait Parry Channel Sea ice |
genre_facet |
Antarctic and Alpine Research Arctic Arctic Baffin Bay Baffin Bay Baffin Foraminifera* Iceberg* Lancaster Sound Nares strait Parry Channel Sea ice |
op_source |
Arctic, Antarctic, and Alpine Research, Vol 54, Iss 1, Pp 395-427 (2022) |
op_relation |
doi:10.1080/15230430.2022.2110689 1938-4246 1523-0430 https://doaj.org/article/9dc8f16a3d92400fac7fb36010e763b1 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1080/15230430.2022.2110689 |
container_title |
Arctic, Antarctic, and Alpine Research |
container_volume |
54 |
container_issue |
1 |
container_start_page |
395 |
op_container_end_page |
427 |
_version_ |
1766286861298302976 |