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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 <jats:italic>a<\/jats:italic>) in a 100\u00a0m by 100\u00a0m area of a Weddell Sea pack ice floe, using under\u2010ice irradiance measurements taken with an instrumented remotely operated vehicle. We identified significant correlations (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001) 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 (<jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup>\u00a0=\u00a00.30) 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.<\/jats:p>","DOI":"10.1002\/2017gl074346","type":"journal-article","created":{"date-parts":[[2017,7,14]],"date-time":"2017-07-14T21:57:09Z","timestamp":1500069429000},"page":"7382-7390","source":"Crossref","is-referenced-by-count":36,"title":["Antarctic pack ice algal distribution: Floe\u2010scale spatial variability and predictability from physical parameters"],"prefix":"10.1029","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7118-9136","authenticated-orcid":false,"given":"K. 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Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research  Bremerhaven Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6928-7757","authenticated-orcid":false,"given":"R.","family":"Ricker","sequence":"additional","affiliation":[{"name":"Sea Ice Physics Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research  Bremerhaven Germany"},{"name":"Laboratoire d'Oc\u00e9anographie Physique et Spatiale, IUEM University of Brest, CNRS, IRD, Ifremer  Brest France"}]},{"given":"M.","family":"Milnes","sequence":"additional","affiliation":[{"name":"Department of the Environment and Energy Australian Antarctic Division  Kingston Tasmania Australia"}]},{"given":"K.","family":"Newbery","sequence":"additional","affiliation":[{"name":"Department of the Environment and Energy Australian Antarctic Division  Kingston Tasmania Australia"}]},{"given":"U.","family":"Freier","sequence":"additional","affiliation":[{"name":"SC\u2010Scientific Consulting  Neuss 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