Ice platelets below Weddell Sea landfast sea ice
Basal melt of ice shelves may lead to an accumulation of disc-shaped ice platelets underneath nearby sea ice, to form a sub-ice platelet layer. Here we present the seasonal cycle of sea ice attached to the Ekström Ice Shelf, Antarctica, and the underlying platelet layer in 2012. Ice platelets emerge...
Published in: | Annals of Glaciology |
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INT GLACIOL SOC
2015
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Online Access: | https://epic.awi.de/id/eprint/37245/ https://epic.awi.de/id/eprint/37245/1/t69a678.pdf https://hdl.handle.net/10013/epic.44916 https://hdl.handle.net/10013/epic.44916.d001 |
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ftawi:oai:epic.awi.de:37245 2023-05-15T13:29:48+02:00 Ice platelets below Weddell Sea landfast sea ice Hoppmann, Mario Nicolaus, Marcel Paul, Stephan Hunkeler, Priska A. Heinemann, Günther Willmes, Sascha Timmermann, Ralph Boebel, Olaf Schmidt, Thomas Kühnel, Meike König-Langlo, Gert Gerdes, Rüdiger 2015 application/pdf https://epic.awi.de/id/eprint/37245/ https://epic.awi.de/id/eprint/37245/1/t69a678.pdf https://hdl.handle.net/10013/epic.44916 https://hdl.handle.net/10013/epic.44916.d001 unknown INT GLACIOL SOC https://epic.awi.de/id/eprint/37245/1/t69a678.pdf https://hdl.handle.net/10013/epic.44916.d001 Hoppmann, M. orcid:0000-0003-1294-9531 , Nicolaus, M. orcid:0000-0003-0903-1746 , Paul, S. orcid:0000-0002-5136-714X , Hunkeler, P. A. , Heinemann, G. , Willmes, S. , Timmermann, R. , Boebel, O. orcid:0000-0002-2259-0035 , Schmidt, T. , Kühnel, M. , König-Langlo, G. and Gerdes, R. (2015) Ice platelets below Weddell Sea landfast sea ice , Annals of Glaciology, 56 (69), pp. 175-190 . doi:10.3189/2015AoG69A678 <https://doi.org/10.3189/2015AoG69A678> , hdl:10013/epic.44916 EPIC3Annals of Glaciology, INT GLACIOL SOC, 56(69), pp. 175-190, ISSN: 0260-3055 Article isiRev 2015 ftawi https://doi.org/10.3189/2015AoG69A678 2021-12-24T15:40:12Z Basal melt of ice shelves may lead to an accumulation of disc-shaped ice platelets underneath nearby sea ice, to form a sub-ice platelet layer. Here we present the seasonal cycle of sea ice attached to the Ekström Ice Shelf, Antarctica, and the underlying platelet layer in 2012. Ice platelets emerged from the cavity and interacted with the fast-ice cover of Atka Bay as early as June. Episodic accumulations throughout winter and spring led to an average platelet-layer thickness of 4m by December 2012, with local maxima of up to 10 m. The additional buoyancy partly prevented surface flooding and snow-ice formation, despite a thick snow cover. Subsequent thinning of the platelet layer from December onwards was associated with an inflow of warm surface water. The combination of model studies with observed fast-ice thickness revealed an average ice-volume fraction in the platelet layer of 0.25+-0.1. We found that nearly half of the combined solid sea-ice and ice-platelet volume in this area is generated by heat transfer to the ocean rather than to the atmosphere. The total ice-platelet volume underlying Atka Bay fast ice was equivalent to more than one-fifth of the annual basal melt volume under the Ekström Ice Shelf. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Ice Shelf Ice Shelves Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Atka ENVELOPE(151.789,151.789,60.835,60.835) Ekström Ice Shelf ENVELOPE(-8.000,-8.000,-71.000,-71.000) Weddell Weddell Sea Annals of Glaciology 56 69 175 190 |
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 |
Basal melt of ice shelves may lead to an accumulation of disc-shaped ice platelets underneath nearby sea ice, to form a sub-ice platelet layer. Here we present the seasonal cycle of sea ice attached to the Ekström Ice Shelf, Antarctica, and the underlying platelet layer in 2012. Ice platelets emerged from the cavity and interacted with the fast-ice cover of Atka Bay as early as June. Episodic accumulations throughout winter and spring led to an average platelet-layer thickness of 4m by December 2012, with local maxima of up to 10 m. The additional buoyancy partly prevented surface flooding and snow-ice formation, despite a thick snow cover. Subsequent thinning of the platelet layer from December onwards was associated with an inflow of warm surface water. The combination of model studies with observed fast-ice thickness revealed an average ice-volume fraction in the platelet layer of 0.25+-0.1. We found that nearly half of the combined solid sea-ice and ice-platelet volume in this area is generated by heat transfer to the ocean rather than to the atmosphere. The total ice-platelet volume underlying Atka Bay fast ice was equivalent to more than one-fifth of the annual basal melt volume under the Ekström Ice Shelf. |
format |
Article in Journal/Newspaper |
author |
Hoppmann, Mario Nicolaus, Marcel Paul, Stephan Hunkeler, Priska A. Heinemann, Günther Willmes, Sascha Timmermann, Ralph Boebel, Olaf Schmidt, Thomas Kühnel, Meike König-Langlo, Gert Gerdes, Rüdiger |
spellingShingle |
Hoppmann, Mario Nicolaus, Marcel Paul, Stephan Hunkeler, Priska A. Heinemann, Günther Willmes, Sascha Timmermann, Ralph Boebel, Olaf Schmidt, Thomas Kühnel, Meike König-Langlo, Gert Gerdes, Rüdiger Ice platelets below Weddell Sea landfast sea ice |
author_facet |
Hoppmann, Mario Nicolaus, Marcel Paul, Stephan Hunkeler, Priska A. Heinemann, Günther Willmes, Sascha Timmermann, Ralph Boebel, Olaf Schmidt, Thomas Kühnel, Meike König-Langlo, Gert Gerdes, Rüdiger |
author_sort |
Hoppmann, Mario |
title |
Ice platelets below Weddell Sea landfast sea ice |
title_short |
Ice platelets below Weddell Sea landfast sea ice |
title_full |
Ice platelets below Weddell Sea landfast sea ice |
title_fullStr |
Ice platelets below Weddell Sea landfast sea ice |
title_full_unstemmed |
Ice platelets below Weddell Sea landfast sea ice |
title_sort |
ice platelets below weddell sea landfast sea ice |
publisher |
INT GLACIOL SOC |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/37245/ https://epic.awi.de/id/eprint/37245/1/t69a678.pdf https://hdl.handle.net/10013/epic.44916 https://hdl.handle.net/10013/epic.44916.d001 |
long_lat |
ENVELOPE(151.789,151.789,60.835,60.835) ENVELOPE(-8.000,-8.000,-71.000,-71.000) |
geographic |
Atka Ekström Ice Shelf Weddell Weddell Sea |
geographic_facet |
Atka Ekström Ice Shelf Weddell Weddell Sea |
genre |
Annals of Glaciology Antarc* Antarctica Ice Shelf Ice Shelves Sea ice Weddell Sea |
genre_facet |
Annals of Glaciology Antarc* Antarctica Ice Shelf Ice Shelves Sea ice Weddell Sea |
op_source |
EPIC3Annals of Glaciology, INT GLACIOL SOC, 56(69), pp. 175-190, ISSN: 0260-3055 |
op_relation |
https://epic.awi.de/id/eprint/37245/1/t69a678.pdf https://hdl.handle.net/10013/epic.44916.d001 Hoppmann, M. orcid:0000-0003-1294-9531 , Nicolaus, M. orcid:0000-0003-0903-1746 , Paul, S. orcid:0000-0002-5136-714X , Hunkeler, P. A. , Heinemann, G. , Willmes, S. , Timmermann, R. , Boebel, O. orcid:0000-0002-2259-0035 , Schmidt, T. , Kühnel, M. , König-Langlo, G. and Gerdes, R. (2015) Ice platelets below Weddell Sea landfast sea ice , Annals of Glaciology, 56 (69), pp. 175-190 . doi:10.3189/2015AoG69A678 <https://doi.org/10.3189/2015AoG69A678> , hdl:10013/epic.44916 |
op_doi |
https://doi.org/10.3189/2015AoG69A678 |
container_title |
Annals of Glaciology |
container_volume |
56 |
container_issue |
69 |
container_start_page |
175 |
op_container_end_page |
190 |
_version_ |
1766003269214142464 |