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Hunkeler, Priska A; Hoppmann, Mario; Hendricks, Stefan; Kalscheuer, Thomas; Gerdes, Rüdiger (2015): Landfast sea-ice and platelet-layer thickness and conductivity of Atka Bay, Antarctica, December 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.845535, Supplement to: Hunkeler, PA et al. (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

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Abstract:
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.
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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
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13 datasets

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Datasets listed in this publication series

  1. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 1a. https://doi.org/10.1594/PANGAEA.845516
  2. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 1b. https://doi.org/10.1594/PANGAEA.845517
  3. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 1c. https://doi.org/10.1594/PANGAEA.845518
  4. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 2a. https://doi.org/10.1594/PANGAEA.845519
  5. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 2b. https://doi.org/10.1594/PANGAEA.845520
  6. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 3a. https://doi.org/10.1594/PANGAEA.845521
  7. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 3b. https://doi.org/10.1594/PANGAEA.845522
  8. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 4a. https://doi.org/10.1594/PANGAEA.845523
  9. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 4b. https://doi.org/10.1594/PANGAEA.845524
  10. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 5a. https://doi.org/10.1594/PANGAEA.845525
  11. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 5b. https://doi.org/10.1594/PANGAEA.845526
  12. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 6. https://doi.org/10.1594/PANGAEA.845533
  13. Hunkeler, PA; Hoppmann, M; Hendricks, S et al. (2015): Landfast sea-ice and platelet-layer thickness and conductivity along Transect 7. https://doi.org/10.1594/PANGAEA.845534