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

Fripiat, F., Meiners, K. M., Vancoppenolle, M., Papadimitriou, S., Thomas, D. N., Ackley, S. F., et al. (2017). Macro-nutrient concentrations in Antarctic pack ice: Overall patterns and overlooked processes. Elementa: Science of the Anthropocene, 5: 13. doi:10.1525/elementa.217.

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 Urheber:
Fripiat, F.1, Autor           
Meiners, Klaus M.2, Autor
Vancoppenolle, Martin2, Autor
Papadimitriou, Stathys2, Autor
Thomas, David N.2, Autor
Ackley, Stephen F.2, Autor
Arrigo, Kevin R.2, Autor
Carnat, Gauthier2, Autor
Cozzi, Stefano2, Autor
Delille, Bruno2, Autor
Dieckmann, Gerhard S.2, Autor
Dunbar, Robert B.2, Autor
Fransson, Agneta2, Autor
Kattner, Gerhard2, Autor
Kennedy, Hilary2, Autor
Lannuzel, Delphine2, Autor
Munro, David R.2, Autor
Nomura, Daiki2, Autor
Rintala, Janne-Markus2, Autor
Schoemann, Veronique2, Autor
Stefels, Jacqueline2, AutorSteiner, Nadja2, AutorTison, Jean-Louis2, Autor mehr..
Affiliations:
1Climate Geochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_2237635              
2external, ou_persistent22              

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 Zusammenfassung: 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.

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Sprache(n): eng - English
 Datum: 2017
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000397959000001
DOI: 10.1525/elementa.217
 Art des Abschluß: -

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Titel: Elementa: Science of the Anthropocene
  Andere : Elem Sci Anth
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Oakland, CA : Univ. of California Press
Seiten: - Band / Heft: 5 Artikelnummer: 13 Start- / Endseite: - Identifikator: Anderer: 2325-1026
CoNE: https://pure.mpg.de/cone/journals/resource/2325-1026