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...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2022-12-01
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| Series: | Arctic, Antarctic, and Alpine Research |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/15230430.2022.2110689 |
| _version_ | 1798001683428540416 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-11T11:41:27Z |
| format | Article |
| id | doaj.art-9dc8f16a3d92400fac7fb36010e763b1 |
| institution | Directory Open Access Journal |
| issn | 1523-0430 1938-4246 |
| language | English |
| last_indexed | 2024-04-11T11:41:27Z |
| publishDate | 2022-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Arctic, Antarctic, and Alpine Research |
| spelling | doaj.art-9dc8f16a3d92400fac7fb36010e763b12022-12-22T04:25:50ZengTaylor & Francis GroupArctic, Antarctic, and Alpine Research1523-04301938-42462022-12-0154139542710.1080/15230430.2022.2110689Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channelsRobert Kelleher0Anne Jennings1John Andrews2Nicole K. S. Brooks3Tom Marchitto4Shaoting Feng5Lineke Woelders6Alexandre Normandeau7Kimberley Jenner8Robbie Bennett9Sarah Brookins10INSTAAR, University of Colorado, Boulder, Colorado, USAINSTAAR, University of Colorado, Boulder, Colorado, USAINSTAAR, University of Colorado, Boulder, Colorado, USAINSTAAR, University of Colorado, Boulder, Colorado, USAINSTAAR, University of Colorado, Boulder, Colorado, USAINSTAAR, University of Colorado, Boulder, Colorado, USAINSTAAR, University of Colorado, Boulder, Colorado, USAGeological Survey of Canada (Atlantic), Natural Resources Canada, Dartmouth, Nova Scotia, CanadaGeological Survey of Canada (Atlantic), Natural Resources Canada, Dartmouth, Nova Scotia, CanadaGeological Survey of Canada (Atlantic), Natural Resources Canada, Dartmouth, Nova Scotia, CanadaINSTAAR, University of Colorado, Boulder, Colorado, USAMultiple 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.https://www.tandfonline.com/doi/10.1080/15230430.2022.2110689DeglaciationParry ChannelBBDC eventsBaffin Bayforaminifera |
| spellingShingle | 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 Arctic, Antarctic, and Alpine Research Deglaciation Parry Channel BBDC events Baffin Bay foraminifera |
| title | 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_short | 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 |
| topic | Deglaciation Parry Channel BBDC events Baffin Bay foraminifera |
| url | https://www.tandfonline.com/doi/10.1080/15230430.2022.2110689 |
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