Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut
Funding: Instrument development and fieldwork were supported by the Northern Transportation Adaptation Initiative of Transport Canada, the Polar Knowledge Canada Safe Passage project (no. 1516-065), and Polar Knowledge Canada's Northern Scientific Training Program. Anna J. Crawford received per...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/19708 2023-07-02T03:31:44+02:00 Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut Crawford, A. J. Mueller, D. Crocker, G. Mingo, L. Desjardins, L. Dumont, D. Babin, M. University of St Andrews. School of Geography & Sustainable Development 2020-03-25T15:30:02Z 15 application/pdf http://hdl.handle.net/10023/19708 https://doi.org/10.5194/tc-14-1067-2020 eng eng The Cryosphere Crawford , A J , Mueller , D , Crocker , G , Mingo , L , Desjardins , L , Dumont , D & Babin , M 2020 , ' Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut ' , The Cryosphere , vol. 14 , no. 3 , pp. 1067-1081 . https://doi.org/10.5194/tc-14-1067-2020 1994-0416 PURE: 267052402 PURE UUID: d70b7dc9-9380-4426-844b-f5145d7647e9 Bibtex: tc-14-1067-2020 Scopus: 85082709046 WOS: 000521943800001 http://hdl.handle.net/10023/19708 https://doi.org/10.5194/tc-14-1067-2020 Copyright © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. GE Environmental Sciences 3rd-DAS SDG 14 - Life Below Water GE Journal article 2020 ftstandrewserep https://doi.org/10.5194/tc-14-1067-2020 2023-06-13T18:31:06Z Funding: Instrument development and fieldwork were supported by the Northern Transportation Adaptation Initiative of Transport Canada, the Polar Knowledge Canada Safe Passage project (no. 1516-065), and Polar Knowledge Canada's Northern Scientific Training Program. Anna J. Crawford received personal funding from the Garfield Weston Foundation, the Natural Sciences and Engineering Research Council (Canada), and Environment and Climate Change Canada. A 130 km2 tabular iceberg calved from Petermann Glacier innorthwestern Greenland on 5 August 2012. Subsequent fracturing generated manyindividual large “ice islands”, including Petermann ice island (PII)-A-1-f, which drifted between Nares Strait and the North Atlantic.Thinning caused by basal and surface ablation increases the likelihood thatthese ice islands will fracture and disperse further, thereby increasing therisk to marine transport and infrastructure as well as affecting thedistribution of freshwater from the polar ice sheets. We use a uniquestationary and mobile ice-penetrating radar dataset collected over fourcampaigns to PII-A-1-f to quantify and contextualize ice island surface andbasal ablation rates and calibrate a forced convection basal ablation model.The ice island thinned by 4.7 m over 11 months. The majority of thinning (73 %) resulted from basal ablation, but the volume loss associated withbasal ablation was ∼12 times less than that caused by arealreduction (e.g. wave erosion, calving, and fracture). However, localizedthinning may have influenced a large fracture event that occurred along asection of ice that was ∼40 m thinner than the remainder ofthe ice island. The calibration of the basal ablation model, the first knownto be conducted with field data, supports assigning thetheoretically derived value of 1.2×10−5 m2∕5 s−1/5 ∘C−1 to the model's bulk heat transfercoefficient with the use of an empirically estimated ice–ocean interfacetemperature. Overall, this work highlights the value of systematicallycollecting ice island field data for ... Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin glacier glacier* Greenland Nares strait Nunavut Petermann glacier The Cryosphere University of St Andrews: Digital Research Repository Baffin Bay Canada Crawford ENVELOPE(-86.467,-86.467,-77.717,-77.717) Greenland Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Nunavut The Cryosphere 14 3 1067 1081 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
GE Environmental Sciences 3rd-DAS SDG 14 - Life Below Water GE |
spellingShingle |
GE Environmental Sciences 3rd-DAS SDG 14 - Life Below Water GE Crawford, A. J. Mueller, D. Crocker, G. Mingo, L. Desjardins, L. Dumont, D. Babin, M. Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut |
topic_facet |
GE Environmental Sciences 3rd-DAS SDG 14 - Life Below Water GE |
description |
Funding: Instrument development and fieldwork were supported by the Northern Transportation Adaptation Initiative of Transport Canada, the Polar Knowledge Canada Safe Passage project (no. 1516-065), and Polar Knowledge Canada's Northern Scientific Training Program. Anna J. Crawford received personal funding from the Garfield Weston Foundation, the Natural Sciences and Engineering Research Council (Canada), and Environment and Climate Change Canada. A 130 km2 tabular iceberg calved from Petermann Glacier innorthwestern Greenland on 5 August 2012. Subsequent fracturing generated manyindividual large “ice islands”, including Petermann ice island (PII)-A-1-f, which drifted between Nares Strait and the North Atlantic.Thinning caused by basal and surface ablation increases the likelihood thatthese ice islands will fracture and disperse further, thereby increasing therisk to marine transport and infrastructure as well as affecting thedistribution of freshwater from the polar ice sheets. We use a uniquestationary and mobile ice-penetrating radar dataset collected over fourcampaigns to PII-A-1-f to quantify and contextualize ice island surface andbasal ablation rates and calibrate a forced convection basal ablation model.The ice island thinned by 4.7 m over 11 months. The majority of thinning (73 %) resulted from basal ablation, but the volume loss associated withbasal ablation was ∼12 times less than that caused by arealreduction (e.g. wave erosion, calving, and fracture). However, localizedthinning may have influenced a large fracture event that occurred along asection of ice that was ∼40 m thinner than the remainder ofthe ice island. The calibration of the basal ablation model, the first knownto be conducted with field data, supports assigning thetheoretically derived value of 1.2×10−5 m2∕5 s−1/5 ∘C−1 to the model's bulk heat transfercoefficient with the use of an empirically estimated ice–ocean interfacetemperature. Overall, this work highlights the value of systematicallycollecting ice island field data for ... |
author2 |
University of St Andrews. School of Geography & Sustainable Development |
format |
Article in Journal/Newspaper |
author |
Crawford, A. J. Mueller, D. Crocker, G. Mingo, L. Desjardins, L. Dumont, D. Babin, M. |
author_facet |
Crawford, A. J. Mueller, D. Crocker, G. Mingo, L. Desjardins, L. Dumont, D. Babin, M. |
author_sort |
Crawford, A. J. |
title |
Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut |
title_short |
Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut |
title_full |
Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut |
title_fullStr |
Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut |
title_full_unstemmed |
Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut |
title_sort |
ice island thinning : rates and model calibration with in situ observations from baffin bay, nunavut |
publishDate |
2020 |
url |
http://hdl.handle.net/10023/19708 https://doi.org/10.5194/tc-14-1067-2020 |
long_lat |
ENVELOPE(-86.467,-86.467,-77.717,-77.717) ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Baffin Bay Canada Crawford Greenland Nares Nunavut |
geographic_facet |
Baffin Bay Canada Crawford Greenland Nares Nunavut |
genre |
Baffin Bay Baffin Bay Baffin glacier glacier* Greenland Nares strait Nunavut Petermann glacier The Cryosphere |
genre_facet |
Baffin Bay Baffin Bay Baffin glacier glacier* Greenland Nares strait Nunavut Petermann glacier The Cryosphere |
op_relation |
The Cryosphere Crawford , A J , Mueller , D , Crocker , G , Mingo , L , Desjardins , L , Dumont , D & Babin , M 2020 , ' Ice island thinning : rates and model calibration with in situ observations from Baffin Bay, Nunavut ' , The Cryosphere , vol. 14 , no. 3 , pp. 1067-1081 . https://doi.org/10.5194/tc-14-1067-2020 1994-0416 PURE: 267052402 PURE UUID: d70b7dc9-9380-4426-844b-f5145d7647e9 Bibtex: tc-14-1067-2020 Scopus: 85082709046 WOS: 000521943800001 http://hdl.handle.net/10023/19708 https://doi.org/10.5194/tc-14-1067-2020 |
op_rights |
Copyright © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. |
op_doi |
https://doi.org/10.5194/tc-14-1067-2020 |
container_title |
The Cryosphere |
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14 |
container_issue |
3 |
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1067 |
op_container_end_page |
1081 |
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1770271131668840448 |