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Antarctic pack-ice algal distribution: floe-scale spatial variability and predictability from physical parameters

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Author(s)

K. M. Meiners, S. Arndt, S. Bestley, T. Krumpen, R. Ricker, M. Milnes, K. Newbery, U. Freier, S. Jarman, R. King, R. Proud, S. Kawaguchi, B. Meyer

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Abstract

Antarctic pack ice serves as habitat for microalgae which contribute to Southern Ocean primary production and serve as important food source for pelagic herbivores. Ice algal biomass is highly patchy, and remains severely undersampled by classical methods such as spatially restricted ice-coring surveys. Here we provide an unprecedented view of ice algal biomass distribution, mapped (as chlorophyll-a) in a 100m-by-100m area of a Weddell Sea pack-ice floe, using under-ice irradiance measurements taken with an instrumented Remotely Operated Vehicle. We identified significant correlations (p <0.001) between algal biomass and concomitant in situ surface measurements of snow depth, ice thickness and estimated sea-ice freeboard levels using a statistical model. The model's explanatory power (r2 = 0.30) indicates that these parameters alone may provide a first basis for spatial prediction of ice algal biomass, but parameterisation of additional determinants is needed to inform more robust upscaling efforts.
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Original languageEnglish
Pages (from-to)7382-7390
JournalGeophysical Research Letters
Volume44
Issue number14
Early online date29 Jul 2017
DOIs
Publication statusE-pub ahead of print - 29 Jul 2017

    Research areas

  • Sea-ice properties, Snow, Freeboard, Chlorophyll-a, Ice algae, Biomass

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