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Preprints
https://doi.org/10.5194/essd-2020-99
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-99
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  15 Jun 2020

15 Jun 2020

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A revised version of this preprint was accepted for the journal ESSD.

High-resolution mapping of circum-Antarctic landfast sea ice distribution, 2000–2018

Alexander D. Fraser1,2,3, Robert A. Massom4,2, Kay I. Ohshima3, Sascha Willmes5, Peter J. Kappes6, Jessica Cartwright7,8,2, and Rick Porter-Smith2 Alexander D. Fraser et al.
  • 1Institute for Marine and Antarctic Studies, Hobart, Tasmania, Australia
  • 2Antarctic Climate & Ecosystems Cooperative Research Centre, Hobart, Tasmania, Australia
  • 3Institute of Low Temperature Science, Hokkaido University, Sapporo, Hokkaido, Japan
  • 4Australian Antarctic Division, Kingston, Tasmania, Australia
  • 5University of Trier, Germany
  • 6Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries and Wildlife, Oregon State University, USA
  • 7National Oceanography Centre, Southampton, UK
  • 8University of Southampton, Southampton, UK

Abstract. Landfast sea ice (fast ice) is an important component of the Antarctic nearshore marine environment, where it strongly modulates ice sheet-ocean-atmosphere interactions and biological and biogeochemical processes, forms a key habitat, and affects logistical operations. Given the wide-ranging importance of Antarctic fast ice and its sensitivity to climate change, improved knowledge of its distribution (and change and variability therein) is a high priority. Antarctic fast-ice mapping to date has been limited to regional studies and a time series covering East Antarctica from 2000 to 2008. Here, we present the first continuous, high spatiotemporal resolution (1 km, 15 day) time series of circum-Antarctic fast ice extent; this covers the period March 2000 to March 2018, with future updates planned. This dataset was derived by compositing cloud-free satellite visible-thermal infrared imagery using an existing methodology, modified to enhance automation and reduce subjectivity in defining the fast ice edge. This ground-breaking new dataset (Fraser et al., 2020) has wide applicability, and is available at https://doi.org/10.26179/5d267d1ceb60c. The new algorithm presented here will enable continuous large-scale fast ice mapping and monitoring into the future.

Alexander D. Fraser et al.

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Alexander D. Fraser et al.

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Circum-Antarctic landfast sea ice extent, 2000-2018 A. D. Fraser, R. A. Massom, K. I. Ohshima, S. Willmes, P. J. Kappes, J. Cartwright, and R. Porter-Smith https://doi.org/10.26179/5d267d1ceb60c

Alexander D. Fraser et al.

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Short summary
Landfast ice, or fast ice, is a form of sea ice which is mechanically fastened to stationary parts of the coast. Long-term and accurate knowledge of its extent around Antarctica is critical for understanding a number of important Antarctic coastal processes, yet no accurate, large-scale, long-term dataset of of its extent has been available. We address this data gap with this new dataset compiled from satellite imagery, containing high-resolution maps of Antarctic fast ice from 2000 to 2018.
Landfast ice, or fast ice, is a form of sea ice which is mechanically fastened to stationary...
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