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Ice Shelf Water-influenced Fast Ice and Sub-Ice Platelet Layer Thickness Distributions beside the Campbell Ice Tongue in Terra Nova Bay, Antarctica
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  • Gemma Marie Brett,
  • Natasha Blaize Gardiner,
  • Patricia Jean Langhorne,
  • Wolfgang Rack,
  • Christian Haas,
  • Anne Irvin,
  • Sanghee Kim
Gemma Marie Brett
University of Canterbury

Corresponding Author:[email protected]

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Natasha Blaize Gardiner
University of Canterbury, Antarctica New Zealand
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Patricia Jean Langhorne
University of Otago
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Wolfgang Rack
University of Canterbury, NZ
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Christian Haas
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Anne Irvin
Memorial University of Newfoundland, Department of Earth & Space Science & Engineering, York University
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Sanghee Kim
Division of Life Sciences, Korean Polar Research Institute (KOPRI)
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Prior to the present study, no dedicated in situ measurement of the thickness distributions of fast ice and the sub-ice platelet layer, formed by supercooled Ice Shelf Water in the near-surface ocean, had been carried out in Terra Nova Bay. Previous studies have recognised the biological importance of the sub-ice platelet layer observed beneath fast ice beside the Campbell Ice Tongue. Furthermore, a recent airborne survey of fast ice in the western Ross Sea implied that smaller ice bodies (ice tongues and outlet glaciers) contribute to the formation of supercooled Ice Shelf Water. With the objective of inferring source regions and circulation of Ice Shelf Water, we measured fast ice and sub-ice platelet layer thickness distributions near the Campbell Ice Tongue in late spring of 2021, using drill hole surveys and high-resolution ground-based electromagnetic induction soundings. We observed thicker fast ice and sub-ice platelet layer near the ice tongue with very thick and narrow sub-ice platelet layer maxima identifying highly channelled outflow of supercooled Ice Shelf Water from beneath the ice tongue through ice mélange, subglacial formations, and grounded regions. We conclude that a significant volume of supercooled Ice Shelf Water is locally sourced from the Campbell Ice Tongue through basal melting and affirm that the icescape in north Terra Nova Bay results from a complex interplay of glacial morphology, bathymetry, polynya dynamics, and ocean circulation.
20 May 2024Submitted to ESS Open Archive
20 May 2024Published in ESS Open Archive