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<p>The marginal ice zone (MIZ) is the region of sea ice that is strongly influenced by open-ocean processes, particularly ocean waves. The width of the Antarctic MIZ is often quantified by applying thresholds to satellite-derived maps of sea-ice concentration, although this definition lacks any connection to waves. Laser altimetry provides snapshots of wave penetration, but is restricted by cloud cover. To overcome these limitations, we refine radar altimetry techniques to estimate the Antarctic MIZ width from Ka-band radar altimeter data (2013-2024), producing a decade-long climatology of the wave-affected MIZ. Our analysis reveals the regionality and seasonality of the MIZ width, highlighting the under-appreciated dependence of wave penetration on ice-edge aspect (the alignment of the ice edge, relative to north). The wave-affected MIZ covers around 16% of the sea-ice zone. This technique offers a tool for measuring MIZ width and could be applied to earlier satellite datasets, enabling creation of a multi-decade climatology of this important zone and assessment of long-term changes in wave-ice interactions in the Southern Ocean.</p>

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Revealing the Antarctic marginal ice zone with a decade-long wave-in-ice climatology

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月20日

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  • Alexander D. Fraser,
  • Noah Day,
  • Zhaohui Wang,
  • Luke G. Bennetts,
  • Qingxiang Liu,
  • Siobhan O’Farrell,
  • Richard Coleman,
  • Joey Voermans,
  • Shiming Xu,
  • Weixin Zhu,
  • Matthis Auger,
  • Robert A. Massom,
  • Pat Wongpan,
  • Lisa Craw,
  • Jill Brouwer,
  • Takenobu Toyota,
  • Petra Heil,
  • Christopher Horvat

摘要

The marginal ice zone (MIZ) is the region of sea ice that is strongly influenced by open-ocean processes, particularly ocean waves. The width of the Antarctic MIZ is often quantified by applying thresholds to satellite-derived maps of sea-ice concentration, although this definition lacks any connection to waves. Laser altimetry provides snapshots of wave penetration, but is restricted by cloud cover. To overcome these limitations, we refine radar altimetry techniques to estimate the Antarctic MIZ width from Ka-band radar altimeter data (2013-2024), producing a decade-long climatology of the wave-affected MIZ. Our analysis reveals the regionality and seasonality of the MIZ width, highlighting the under-appreciated dependence of wave penetration on ice-edge aspect (the alignment of the ice edge, relative to north). The wave-affected MIZ covers around 16% of the sea-ice zone. This technique offers a tool for measuring MIZ width and could be applied to earlier satellite datasets, enabling creation of a multi-decade climatology of this important zone and assessment of long-term changes in wave-ice interactions in the Southern Ocean.