Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf
Variability in the volume of supercooled Ice Shelf Water outflow in McMurdo Sound is reflected in the thickness and distribution of fast ice and the sub‐ice platelet layer beneath. Ground‐based electromagnetic induction and drill hole surveys of the distribution and thickness of ice shelf‐influenced...
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ftawi:oai:epic.awi.de:51911 2023-05-15T16:41:45+02:00 Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf Brett, G. M. Irvin, A. Rack, W. Haas, C. Langhorne, P. J. Leonard, G. H. 2020 https://epic.awi.de/id/eprint/51911/ https://doi.org/10.1029/2019JC015678 https://hdl.handle.net/10013/epic.766ef535-9efb-4048-a985-9928e183bc8a unknown Brett, G. M. , Irvin, A. , Rack, W. , Haas, C. orcid:0000-0002-7674-3500 , Langhorne, P. J. and Leonard, G. H. (2020) Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf , Journal of Geophysical Research: Oceans, 125 (3) . doi:10.1029/2019JC015678 <https://doi.org/10.1029/2019JC015678> , hdl:10013/epic.766ef535-9efb-4048-a985-9928e183bc8a EPIC3Journal of Geophysical Research: Oceans, 125(3), ISSN: 2169-9275 Article isiRev 2020 ftawi https://doi.org/10.1029/2019JC015678 2021-12-24T15:45:30Z Variability in the volume of supercooled Ice Shelf Water outflow in McMurdo Sound is reflected in the thickness and distribution of fast ice and the sub‐ice platelet layer beneath. Ground‐based electromagnetic induction and drill hole surveys of the distribution and thickness of ice shelf‐influenced fast ice and the sub‐ice platelet layer in McMurdo Sound were carried out in late spring of 2011, 2013, 2016, and 2017. In 2011 and 2017, thicker sub‐ice platelet layers of up to 7.5 and 6 m were observed, respectively. Fast ice formation throughout the winters of 2011 and 2017 was influenced by a higher occurrence of strong southerly wind events and resultant activity of the Ross Sea Polynya. In contrast, lower wind conditions in 2016 led to largely undisturbed sea ice growth and anomalously extensive fast ice coverage. A thinner sub‐ice platelet layer of up to 4 m was observed in 2016. In 2011 and 2017, substantial and variable sub‐ice platelet layers were detected in a region of exchange of water masses between the Ross Sea and the McMurdo‐Ross ice shelf cavity, which were not observed in 2013 and 2016. We hypothesize that a higher frequency of strong southerly wind events, resultant polynya activity, and High Salinity Shelf Water production over winter accelerates circulation and increases melting in the proximal shallow McMurdo Ice Shelf and the deeper Ross Ice Shelf regions of the conjoined cavity. The outflow of supercooled Ice Shelf Water and sub‐ice platelet layer formation in McMurdo Sound are consequently promoted. Article in Journal/Newspaper Ice Shelf McMurdo Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) Journal of Geophysical Research: Oceans 125 3 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Variability in the volume of supercooled Ice Shelf Water outflow in McMurdo Sound is reflected in the thickness and distribution of fast ice and the sub‐ice platelet layer beneath. Ground‐based electromagnetic induction and drill hole surveys of the distribution and thickness of ice shelf‐influenced fast ice and the sub‐ice platelet layer in McMurdo Sound were carried out in late spring of 2011, 2013, 2016, and 2017. In 2011 and 2017, thicker sub‐ice platelet layers of up to 7.5 and 6 m were observed, respectively. Fast ice formation throughout the winters of 2011 and 2017 was influenced by a higher occurrence of strong southerly wind events and resultant activity of the Ross Sea Polynya. In contrast, lower wind conditions in 2016 led to largely undisturbed sea ice growth and anomalously extensive fast ice coverage. A thinner sub‐ice platelet layer of up to 4 m was observed in 2016. In 2011 and 2017, substantial and variable sub‐ice platelet layers were detected in a region of exchange of water masses between the Ross Sea and the McMurdo‐Ross ice shelf cavity, which were not observed in 2013 and 2016. We hypothesize that a higher frequency of strong southerly wind events, resultant polynya activity, and High Salinity Shelf Water production over winter accelerates circulation and increases melting in the proximal shallow McMurdo Ice Shelf and the deeper Ross Ice Shelf regions of the conjoined cavity. The outflow of supercooled Ice Shelf Water and sub‐ice platelet layer formation in McMurdo Sound are consequently promoted. |
format |
Article in Journal/Newspaper |
author |
Brett, G. M. Irvin, A. Rack, W. Haas, C. Langhorne, P. J. Leonard, G. H. |
spellingShingle |
Brett, G. M. Irvin, A. Rack, W. Haas, C. Langhorne, P. J. Leonard, G. H. Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf |
author_facet |
Brett, G. M. Irvin, A. Rack, W. Haas, C. Langhorne, P. J. Leonard, G. H. |
author_sort |
Brett, G. M. |
title |
Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf |
title_short |
Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf |
title_full |
Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf |
title_fullStr |
Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf |
title_full_unstemmed |
Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf |
title_sort |
variability in the distribution of fast ice and the sub‐ice platelet layer near mcmurdo ice shelf |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/51911/ https://doi.org/10.1029/2019JC015678 https://hdl.handle.net/10013/epic.766ef535-9efb-4048-a985-9928e183bc8a |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Ice Shelf |
geographic_facet |
Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Ice Shelf |
genre |
Ice Shelf McMurdo Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea Sea ice |
genre_facet |
Ice Shelf McMurdo Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea Sea ice |
op_source |
EPIC3Journal of Geophysical Research: Oceans, 125(3), ISSN: 2169-9275 |
op_relation |
Brett, G. M. , Irvin, A. , Rack, W. , Haas, C. orcid:0000-0002-7674-3500 , Langhorne, P. J. and Leonard, G. H. (2020) Variability in the Distribution of Fast Ice and the Sub‐ice Platelet Layer Near McMurdo Ice Shelf , Journal of Geophysical Research: Oceans, 125 (3) . doi:10.1029/2019JC015678 <https://doi.org/10.1029/2019JC015678> , hdl:10013/epic.766ef535-9efb-4048-a985-9928e183bc8a |
op_doi |
https://doi.org/10.1029/2019JC015678 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
3 |
_version_ |
1766032224602292224 |