Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012, 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
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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ftdatacite:10.1594/pangaea.845535 2023-05-15T13:35:31+02:00 Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012, 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 Hunkeler, Priska A Hoppmann, Mario Hendricks, Stefan Kalscheuer, Thomas Gerdes, Rüdiger 2015 application/zip https://dx.doi.org/10.1594/pangaea.845535 https://doi.pangaea.de/10.1594/PANGAEA.845535 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1002/2015gl065074 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Sea Ice Physics @ AWI AWI_SeaIce Collection article Supplementary Collection of Datasets 2015 ftdatacite https://doi.org/10.1594/pangaea.845535 https://doi.org/10.1002/2015gl065074 2021-11-05T12:55:41Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Sea ice Weddell Sea DataCite Metadata Store (German National Library of Science and Technology) Antarctic Weddell Sea Weddell Atka ENVELOPE(151.789,151.789,60.835,60.835) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Sea Ice Physics @ AWI AWI_SeaIce |
spellingShingle |
Sea Ice Physics @ AWI AWI_SeaIce 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, 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 |
topic_facet |
Sea Ice Physics @ AWI AWI_SeaIce |
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 |
Article in Journal/Newspaper |
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, 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 |
title_short |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012, 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 |
title_full |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012, 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 |
title_fullStr |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012, 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 |
title_full_unstemmed |
Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012, 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 |
title_sort |
landfast sea-ice and platelet-layer thickness and conductivity of atka bay, antarctica, december 2012, 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 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2015 |
url |
https://dx.doi.org/10.1594/pangaea.845535 https://doi.pangaea.de/10.1594/PANGAEA.845535 |
long_lat |
ENVELOPE(151.789,151.789,60.835,60.835) |
geographic |
Antarctic Weddell Sea Weddell Atka |
geographic_facet |
Antarctic Weddell Sea Weddell Atka |
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_relation |
https://dx.doi.org/10.1002/2015gl065074 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.845535 https://doi.org/10.1002/2015gl065074 |
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1766066687950454784 |