Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer

Elizabeth M. Jones, Sian F. Henley, Maria A. Van Leeuwe, Jacqueline Stefels, Michael P. Meredith, Mairi Fenton, Hugh J. Venables

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Seasonal cycling in carbon, alkalinity, and nutrients in landfast sea ice in Hangar Cove, Adelaide Island, West Antarctic Peninsula, were investigated during winter, spring, and summer 2014–2015. Temporal dynamics were driven by changes in the ice-sea physicochemical conditions, ice-algal community composition, and organic matter production. Winter sea ice was enriched with dissolved inorganic carbon (DIC) and inorganic nutrients from organic matter remineralization. Variations in alkalinity (Alk) and DIC indicated that abiotic calcium carbonate (ikaite) precipitation had taken place. Relative to other nutrients, low phosphate (PO4) concentrations potentially resulted from co-precipitation with ikaite. Seawater flooding and meltwater induced variability in the physical and biogeochemical properties in the upper ice in spring where nutrient resupply supported haptophyte productivity and increased particulate organic carbon (POC) in the interstitial layer. Rapid nitrate (NO3) and DIC (
Original languageEnglish
JournalLimnology and Oceanography
Early online date10 Nov 2022
DOIs
Publication statusE-pub ahead of print - 10 Nov 2022

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