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Thick and deformed Antarctic sea ice mapped with autonomous underwater vehicles

Abstract

Satellites have documented trends in Antarctic sea-ice extent and its variability for decades, but estimating sea-ice thickness in the Antarctic from remote sensing data remains challenging. In situ observations needed for validation of remote sensing data and sea-ice models are limited; most have been restricted to a few point measurements on selected ice floes, or to visual shipboard estimates. Here we present three-dimensional (3D) floe-scale maps of sea-ice draft for ten floes, compiled from two springtime expeditions by an autonomous underwater vehicle to the near-coastal regions of the Weddell, Bellingshausen, and Wilkes Land sectors of Antarctica. Mean drafts range from 1.4 to 5.5 m, with maxima up to 16 m. We also find that, on average, 76% of the ice volume is deformed ice. Our surveys indicate that the floes are much thicker and more deformed than reported by most drilling and ship-based measurements of Antarctic sea ice. We suggest that thick ice in the near-coastal and interior pack may be under-represented in existing in situ assessments of Antarctic sea ice and hence, on average, Antarctic sea ice may be thicker than previously thought.

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Figure 1: IceBell and SIPEX-2 Study areas.
Figure 2: 3D floe-scale sea-ice draft maps.
Figure 3: Ice draft thickness distribution.

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Acknowledgements

We are grateful for the professionalism of the officers, crew and technical staff of the RSS J. C. Ross (IceBell) and RV Aurora Australis (SIPEX-II). J. Pietro from the Woods Hole Oceanographic Institution and R. Frost and P. Alexander from the Australian Maritime College at the University of Tasmania provided assistance in the field. K. Meiners, A. Steer, P. Heil and R. Massom (AAD), and R. Scharein (UVic) provided ice and snow properties data. C. Dietz (UTAS-CSL), A. Moy (AAD) and E. Rohling (NOC) analysed the oxygen isotope data. This work was supported by the Australian Government’s Cooperative Research Centres Programme through the Antarctic Climate and Ecosystem Cooperative Research Centre. Support for the IceBell cruise was supplied by the British Antarctic Survey and NERC grant NE/H009620/1. Support for the SIPEX-2 cruise was through the Australian Antarctic Science Grant No. 4073. T.M. was supported in part by NSF grant OPP-1142075. H.S. was supported by NSF grant ANT-1039951.

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J.W., T.M. and G.W. conceived and led the fieldwork. H.S., C.K., C.M. and P.K. developed the AUV and operated it in the field. C.K. processed the multibeam and AUV data. G.W., T.M. and J.W. wrote the paper.

Corresponding authors

Correspondence to G. Williams or T. Maksym or J. Wilkinson.

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The authors declare no competing financial interests.

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Williams, G., Maksym, T., Wilkinson, J. et al. Thick and deformed Antarctic sea ice mapped with autonomous underwater vehicles. Nature Geosci 8, 61–67 (2015). https://doi.org/10.1038/ngeo2299

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