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Macro-nutrient concentrations in Antarctic pack ice : overall patterns and overlooked processes

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Title: Macro-nutrient concentrations in Antarctic pack ice : overall patterns and overlooked processes
Authors: Fripiat, François Browse this author
Meiners, Klaus M. Browse this author
Vancoppenolle, Martin Browse this author
Papadimitriou, Stathys Browse this author
Thomas, David N. Browse this author
Ackley, Stephen F. Browse this author
Arrigo, Kevin R. Browse this author
Carnat, Gauthier Browse this author
Cozzi, Stefano Browse this author
Delille, Bruno Browse this author
Dieckmann, Gerhard S. Browse this author
Dunbar, Robert B. Browse this author
Fransson, Agneta Browse this author
Kattner, Gerhard Browse this author
Kennedy, Hilary Browse this author
Lannuzel, Delphine Browse this author
Munro, David R. Browse this author
Nomura, Daiki Browse this author →KAKEN DB
Rintala, Janne-Markus Browse this author
Schoemann, Véronique Browse this author
Stefels, Jacqueline Browse this author
Steiner, Nadja Browse this author
Tison, Jean-Louis Browse this author
Keywords: Nutrients
sea ice
Issue Date: 29-Mar-2017
Publisher: University of California Press
Journal Title: Elementa : Science of the Anthropocene
Volume: 5
Start Page: 13
Publisher DOI: 10.1525/elementa.217
Abstract: Antarctic pack ice is inhabited by a diverse and active microbial community reliant on nutrients for growth. Seeking patterns and overlooked processes, we performed a large-scale compilation of macro-nutrient data (hereafter termed nutrients) in Antarctic pack ice (306 ice-cores collected from 19 research cruises). Dissolved inorganic nitrogen and silicic acid concentrations change with time, as expected from a seasonally productive ecosystem. In winter, salinity-normalized nitrate and silicic acid concentrations (C*) in sea ice are close to seawater concentrations (Cw), indicating little or no biological activity. In spring, nitrate and silicic acid concentrations become partially depleted with respect to seawater (C* < Cw), commensurate with the seasonal build-up of ice microalgae promoted by increased insolation. Stronger and earlier nitrate than silicic acid consumption suggests that a significant fraction of the primary productivity in sea ice is sustained by flagellates. By both consuming and producing ammonium and nitrite, the microbial community maintains these nutrients at relatively low concentrations in spring. With the decrease in insolation beginning in late summer, dissolved inorganic nitrogen and silicic acid concentrations increase, indicating imbalance between their production (increasing or unchanged) and consumption (decreasing) in sea ice. Unlike the depleted concentrations of both nitrate and silicic acid from spring to summer, phosphate accumulates in sea ice (C* > Cw). The phosphate excess could be explained by a greater allocation to phosphorus-rich biomolecules during ice algal blooms coupled with convective loss of excess dissolved nitrogen, preferential remineralization of phosphorus, and/or phosphate adsorption onto metal-organic complexes. Ammonium also appears to be efficiently adsorbed onto organic matter, with likely consequences to nitrogen mobility and availability. This dataset supports the view that the sea ice microbial community is highly efficient at processing nutrients but with a dynamic quite different from that in oceanic surface waters calling for focused future investigations.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 大樹

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