Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study
Antarctic coastal polynyas serve as crucially-important sea-ice factories and are (in certain cases) of global significance as sites of Antarctic Bottom Water (AABW) formation e.g., the Cape Darnley Polynya (CDP) in East Antarctica. As such, understanding change and variability in their behaviour, a...
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Online Access: | https://doi.org/10.1016/j.rse.2019.111315 http://ecite.utas.edu.au/137264 |
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ftunivtasecite:oai:ecite.utas.edu.au:137264 2023-05-15T13:42:40+02:00 Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study Fraser, AD Ohshima, KI Nihashi, S Massom, RA Tamura, T Nakata, K Williams, GD Carpentier, S Willmes, S 2019 https://doi.org/10.1016/j.rse.2019.111315 http://ecite.utas.edu.au/137264 en eng Elsevier Science Inc http://dx.doi.org/10.1016/j.rse.2019.111315 Fraser, AD and Ohshima, KI and Nihashi, S and Massom, RA and Tamura, T and Nakata, K and Williams, GD and Carpentier, S and Willmes, S, Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study, Remote Sensing of Environment, 233 Article 111315. ISSN 0034-4257 (2019) [Refereed Article] http://ecite.utas.edu.au/137264 Earth Sciences Physical geography and environmental geoscience Glaciology Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1016/j.rse.2019.111315 2022-08-29T22:17:49Z Antarctic coastal polynyas serve as crucially-important sea-ice factories and are (in certain cases) of global significance as sites of Antarctic Bottom Water (AABW) formation e.g., the Cape Darnley Polynya (CDP) in East Antarctica. As such, understanding change and variability in their behaviour, and the factors responsible, is a high priority in climate (change) science. One such important factor that is both poorly understood and quantified is their linkage with adjacent landfast sea ice (fast ice). Here, we present a first detailed analysis that identifies and quantifies key linkages between the dynamics/behaviour of the CDP and fast ice. By forming a barrier to the incursion of pack ice at the eastern boundary, fast ice immediately upstream of the CDP (associated with the distribution of grounded icebergs) plays a crucially-important role in the polynya formation, maintenance and variability. This satellite data-based study builds upon earlier conceptual work on polynya-fast ice feedback mechanisms in the Mertz Glacier region by showing that statistical estimation of the rates of sea ice production (and hence AABW formation) in the CDP is significantly improved through inclusion of two key fast-ice metrics, compared to use of atmospheric covariates alone. These two metrics are the meridional extent of fast ice upstream of the polynya and total fast ice area within the region of high sea ice production. The work highlights the importance of accurate representation of the coupled Antarctic coastal polynya-fast ice system in global climate models. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Iceberg* Mertz Glacier Sea ice eCite UTAS (University of Tasmania) Antarctic East Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) Darnley ENVELOPE(69.717,69.717,-67.717,-67.717) Cape Darnley ENVELOPE(69.567,69.567,-67.738,-67.738) Remote Sensing of Environment 233 111315 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical geography and environmental geoscience Glaciology |
spellingShingle |
Earth Sciences Physical geography and environmental geoscience Glaciology Fraser, AD Ohshima, KI Nihashi, S Massom, RA Tamura, T Nakata, K Williams, GD Carpentier, S Willmes, S Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study |
topic_facet |
Earth Sciences Physical geography and environmental geoscience Glaciology |
description |
Antarctic coastal polynyas serve as crucially-important sea-ice factories and are (in certain cases) of global significance as sites of Antarctic Bottom Water (AABW) formation e.g., the Cape Darnley Polynya (CDP) in East Antarctica. As such, understanding change and variability in their behaviour, and the factors responsible, is a high priority in climate (change) science. One such important factor that is both poorly understood and quantified is their linkage with adjacent landfast sea ice (fast ice). Here, we present a first detailed analysis that identifies and quantifies key linkages between the dynamics/behaviour of the CDP and fast ice. By forming a barrier to the incursion of pack ice at the eastern boundary, fast ice immediately upstream of the CDP (associated with the distribution of grounded icebergs) plays a crucially-important role in the polynya formation, maintenance and variability. This satellite data-based study builds upon earlier conceptual work on polynya-fast ice feedback mechanisms in the Mertz Glacier region by showing that statistical estimation of the rates of sea ice production (and hence AABW formation) in the CDP is significantly improved through inclusion of two key fast-ice metrics, compared to use of atmospheric covariates alone. These two metrics are the meridional extent of fast ice upstream of the polynya and total fast ice area within the region of high sea ice production. The work highlights the importance of accurate representation of the coupled Antarctic coastal polynya-fast ice system in global climate models. |
format |
Article in Journal/Newspaper |
author |
Fraser, AD Ohshima, KI Nihashi, S Massom, RA Tamura, T Nakata, K Williams, GD Carpentier, S Willmes, S |
author_facet |
Fraser, AD Ohshima, KI Nihashi, S Massom, RA Tamura, T Nakata, K Williams, GD Carpentier, S Willmes, S |
author_sort |
Fraser, AD |
title |
Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study |
title_short |
Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study |
title_full |
Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study |
title_fullStr |
Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study |
title_full_unstemmed |
Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study |
title_sort |
landfast ice controls on sea-ice production in the cape darnley polynya: a case study |
publisher |
Elsevier Science Inc |
publishDate |
2019 |
url |
https://doi.org/10.1016/j.rse.2019.111315 http://ecite.utas.edu.au/137264 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) ENVELOPE(69.717,69.717,-67.717,-67.717) ENVELOPE(69.567,69.567,-67.738,-67.738) |
geographic |
Antarctic East Antarctica Mertz Glacier Darnley Cape Darnley |
geographic_facet |
Antarctic East Antarctica Mertz Glacier Darnley Cape Darnley |
genre |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Mertz Glacier Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Iceberg* Mertz Glacier Sea ice |
op_relation |
http://dx.doi.org/10.1016/j.rse.2019.111315 Fraser, AD and Ohshima, KI and Nihashi, S and Massom, RA and Tamura, T and Nakata, K and Williams, GD and Carpentier, S and Willmes, S, Landfast ice controls on sea-ice production in the Cape Darnley Polynya: a case study, Remote Sensing of Environment, 233 Article 111315. ISSN 0034-4257 (2019) [Refereed Article] http://ecite.utas.edu.au/137264 |
op_doi |
https://doi.org/10.1016/j.rse.2019.111315 |
container_title |
Remote Sensing of Environment |
container_volume |
233 |
container_start_page |
111315 |
_version_ |
1766171108619321344 |