Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012
Ice shelves strongly impact coastal Antarctic sea-ice and the associated ecosystem through the formation of a sub-sea-ice platelet layer. Although progress has been made in determining and understanding its spatio-temporal variability based on point measurements, an investigation of this phenomenon...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.845535 2023-05-15T13:44:47+02:00 Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012 Hunkeler, Priska A Hoppmann, Mario Hendricks, Stefan Kalscheuer, Thomas Gerdes, Rüdiger MEDIAN LATITUDE: -70.597713 * MEDIAN LONGITUDE: -7.881216 * SOUTH-BOUND LATITUDE: -70.683464 * WEST-BOUND LONGITUDE: -8.147440 * NORTH-BOUND LATITUDE: -70.525719 * EAST-BOUND LONGITUDE: -7.482331 * DATE/TIME START: 2012-11-26T00:00:00 * DATE/TIME END: 2012-12-21T00:00:00 2015-04-23 application/zip, 13 datasets https://doi.pangaea.de/10.1594/PANGAEA.845535 https://doi.org/10.1594/PANGAEA.845535 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.845535 https://doi.org/10.1594/PANGAEA.845535 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Hunkeler, Priska A; Hoppmann, Mario; Hendricks, Stefan; Kalscheuer, Thomas; Gerdes, Rüdiger (2016): A glimpse beneath Antarctic landfast sea ice: platelet-layer volume from multi-frequency electromagnetic induction sounding. Geophysical Research Letters, 43(1), 222-231, https://doi.org/10.1002/2015GL065074 AWI_SeaIce Sea Ice Physics @ AWI Dataset 2015 ftpangaea https://doi.org/10.1594/PANGAEA.845535 https://doi.org/10.1002/2015GL065074 2023-01-20T07:33:26Z Ice shelves strongly impact coastal Antarctic sea-ice and the associated ecosystem through the formation of a sub-sea-ice platelet layer. Although progress has been made in determining and understanding its spatio-temporal variability based on point measurements, an investigation of this phenomenon on a larger scale remains a challenge due to logistical constraints and a lack of suitable methodology. In this study, we applied a laterally-constrained Marquardt-Levenberg inversion to a unique multi-frequency electromagnetic (EM) induction sounding dataset obtained on the landfast sea ice of Atka Bay, eastern Weddell Sea, in 2012. In addition to consistent fast-ice thickness and -conductivities along > 100 km transects; we present the first comprehensive, high resolution platelet-layer thickness and -conductivity dataset recorded on Antarctic sea ice. The reliability of the algorithm was confirmed by using synthetic data, and the inverted platelet-layer thicknesses agreed within the data uncertainty to drill-hole measurements. Ice-volume fractions were calculated from platelet-layer conductivities, revealing that an older and thicker platelet layer is denser and more compacted than a loosely attached, young platelet layer. The overall platelet-layer volume below Atka Bay fast ice suggests that the contribution of ocean/ice-shelf interaction to sea-ice volume in this region is even higher than previously thought. This study also implies that multi-frequency EM induction sounding is an effective approach in determining platelet layer volume on a larger scale than previously feasible. When applied to airborne multi-frequency EM, this method could provide a step towards an Antarctic-wide quantification of ocean/ice-shelf interaction. Dataset Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Atka ENVELOPE(151.789,151.789,60.835,60.835) Weddell Weddell Sea ENVELOPE(-8.147440,-7.482331,-70.525719,-70.683464) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_SeaIce Sea Ice Physics @ AWI |
spellingShingle |
AWI_SeaIce Sea Ice Physics @ AWI Hunkeler, Priska A Hoppmann, Mario Hendricks, Stefan Kalscheuer, Thomas Gerdes, Rüdiger Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012 |
topic_facet |
AWI_SeaIce Sea Ice Physics @ AWI |
description |
Ice shelves strongly impact coastal Antarctic sea-ice and the associated ecosystem through the formation of a sub-sea-ice platelet layer. Although progress has been made in determining and understanding its spatio-temporal variability based on point measurements, an investigation of this phenomenon on a larger scale remains a challenge due to logistical constraints and a lack of suitable methodology. In this study, we applied a laterally-constrained Marquardt-Levenberg inversion to a unique multi-frequency electromagnetic (EM) induction sounding dataset obtained on the landfast sea ice of Atka Bay, eastern Weddell Sea, in 2012. In addition to consistent fast-ice thickness and -conductivities along > 100 km transects; we present the first comprehensive, high resolution platelet-layer thickness and -conductivity dataset recorded on Antarctic sea ice. The reliability of the algorithm was confirmed by using synthetic data, and the inverted platelet-layer thicknesses agreed within the data uncertainty to drill-hole measurements. Ice-volume fractions were calculated from platelet-layer conductivities, revealing that an older and thicker platelet layer is denser and more compacted than a loosely attached, young platelet layer. The overall platelet-layer volume below Atka Bay fast ice suggests that the contribution of ocean/ice-shelf interaction to sea-ice volume in this region is even higher than previously thought. This study also implies that multi-frequency EM induction sounding is an effective approach in determining platelet layer volume on a larger scale than previously feasible. When applied to airborne multi-frequency EM, this method could provide a step towards an Antarctic-wide quantification of ocean/ice-shelf interaction. |
format |
Dataset |
author |
Hunkeler, Priska A Hoppmann, Mario Hendricks, Stefan Kalscheuer, Thomas Gerdes, Rüdiger |
author_facet |
Hunkeler, Priska A Hoppmann, Mario Hendricks, Stefan Kalscheuer, Thomas Gerdes, Rüdiger |
author_sort |
Hunkeler, Priska A |
title |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012 |
title_short |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012 |
title_full |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012 |
title_fullStr |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012 |
title_full_unstemmed |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012 |
title_sort |
landfast sea-ice and platelet-layer thickness and conductivity of atka bay, antarctica, december 2012 |
publisher |
PANGAEA |
publishDate |
2015 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.845535 https://doi.org/10.1594/PANGAEA.845535 |
op_coverage |
MEDIAN LATITUDE: -70.597713 * MEDIAN LONGITUDE: -7.881216 * SOUTH-BOUND LATITUDE: -70.683464 * WEST-BOUND LONGITUDE: -8.147440 * NORTH-BOUND LATITUDE: -70.525719 * EAST-BOUND LONGITUDE: -7.482331 * DATE/TIME START: 2012-11-26T00:00:00 * DATE/TIME END: 2012-12-21T00:00:00 |
long_lat |
ENVELOPE(151.789,151.789,60.835,60.835) ENVELOPE(-8.147440,-7.482331,-70.525719,-70.683464) |
geographic |
Antarctic Atka Weddell Weddell Sea |
geographic_facet |
Antarctic Atka Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Weddell Sea |
op_source |
Supplement to: Hunkeler, Priska A; Hoppmann, Mario; Hendricks, Stefan; Kalscheuer, Thomas; Gerdes, Rüdiger (2016): A glimpse beneath Antarctic landfast sea ice: platelet-layer volume from multi-frequency electromagnetic induction sounding. Geophysical Research Letters, 43(1), 222-231, https://doi.org/10.1002/2015GL065074 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.845535 https://doi.org/10.1594/PANGAEA.845535 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.845535 https://doi.org/10.1002/2015GL065074 |
_version_ |
1766206211366060032 |