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

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 surve...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Meiners, KM, Arndt, S, Bestley, S, Krumpen, T, Ricker, R, Milnes, M, Newbery, K, Freier, U, Jarman, S, King, R, Proud, R, Kawaguchi, S, Meyer, B
Format: Article in Journal/Newspaper
Language:English
Published: Amer Geophysical Union 2017
Subjects:
Biological Sciences
Ecology
Marine and estuarine ecology (incl. marine ichthyology)
Antarctic
Southern Ocean
Weddell Sea
Weddell
Antarc*
Sea ice
Online Access:https://doi.org/10.1002/2017GL074346
http://ecite.utas.edu.au/120052
Description
Summary: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 ( r 2 =0.30) indicates that these parameters alone may provide a first basis for spatial prediction of ice algal biomass, but parameterization of additional determinants is needed to inform more robust upscaling efforts.

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