TY - JOUR
T1 - Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer
AU - Jones, Elizabeth M.
AU - Henley, Sian F.
AU - van Leeuwe, Maria A.
AU - Stefels, Jacqueline
AU - Meredith, Michael P.
AU - Fenton, Mairi
AU - Venables, Hugh J.
N1 - Funding Information:
The authors gratefully acknowledge BAS, Royal Netherlands Institute for Sea Research (NIOZ), and Netherlands Organization for Scientific Research (NWO) for the opportunity to conduct fieldwork at the Dirck Gerritsz and Bonner laboratories at Rothera Research Station. Particular thanks to S Heiser and S Pountney for assistance with sample collection and O. Legge and B. Delille for discussions on ice sampling. The authors acknowledge S. Ossebaar at the Royal NIOZ and M. Woodward at Plymouth Marine Laboratory for macronutrient analyses. This work was part of postdoctoral research (E.M. Jones) at the University of Groningen (partly) funded by the Netherlands Polar Program (NPP) of the NWO (866.13.006). S.F. Henley was funded by an Independent Research Fellowship of the UK Natural Environment Research Council (NE/K010034/1). M.A. van Leeuwe and J. Stefels were funded by NWO under the NPP (866.10.101 and 866.14.101). RaTS is a component of the BAS Polar Oceans research program, funded by the UK Natural Environment Research Council. The authors are grateful for the constructive and valuable comments from the Editor in Chief, Associate Editor and anonymous reviewers that have substantially improved the quality of the manuscript. This work contributes to the aims of the BEPSII network (Biogeochemical Exchange Processes at Sea-Ice Interfaces).
Funding Information:
The authors gratefully acknowledge BAS, Royal Netherlands Institute for Sea Research (NIOZ), and Netherlands Organization for Scientific Research (NWO) for the opportunity to conduct fieldwork at the Dirck Gerritsz and Bonner laboratories at Rothera Research Station. Particular thanks to S Heiser and S Pountney for assistance with sample collection and O. Legge and B. Delille for discussions on ice sampling. The authors acknowledge S. Ossebaar at the Royal NIOZ and M. Woodward at Plymouth Marine Laboratory for macronutrient analyses. This work was part of postdoctoral research (E.M. Jones) at the University of Groningen (partly) funded by the Netherlands Polar Program (NPP) of the NWO (866.13.006). S.F. Henley was funded by an Independent Research Fellowship of the UK Natural Environment Research Council (NE/K010034/1). M.A. van Leeuwe and J. Stefels were funded by NWO under the NPP (866.10.101 and 866.14.101). RaTS is a component of the BAS Polar Oceans research program, funded by the UK Natural Environment Research Council. The authors are grateful for the constructive and valuable comments from the Editor in Chief, Associate Editor and anonymous reviewers that have substantially improved the quality of the manuscript. This work contributes to the aims of the BEPSII network (Biogeochemical Exchange Processes at Ice‐Sea Interfaces).
Publisher Copyright:
© 2022 The Authors. Limnology and Oceanography published by Wiley Periodicals LLC on behalf of Association for the Sciences of Limnology and Oceanography.
PY - 2023/1
Y1 - 2023/1
N2 - 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 sea-ice 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 (< 165 μmol kg−1) uptake occurred alongside substantial build-up of algal biomass (746 μg chlorophyll a L−1) and POC (6191 μmol L−1) during summer. Silicic acid drawdown followed NO3 depletion by approximately 1 month with a shift to diatom-dominated communities. Accumulation of PO4 in the lower ice layers in summer likely resulted from PO4 released during ikaite dissolution in the presence of biofilms. Increased Alk : DIC ratios in the lower ice and under-ice water suggested that ikaite dissolution buffered against meltwater dilution and enhanced the potential for atmospheric CO2 uptake. This study revealed strong seasonality in carbon and nutrient cycling in landfast sea ice and showed the importance of sea ice in biogeochemical cycling in seasonally ice-covered waters around Antarctica.
AB - 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 sea-ice 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 (< 165 μmol kg−1) uptake occurred alongside substantial build-up of algal biomass (746 μg chlorophyll a L−1) and POC (6191 μmol L−1) during summer. Silicic acid drawdown followed NO3 depletion by approximately 1 month with a shift to diatom-dominated communities. Accumulation of PO4 in the lower ice layers in summer likely resulted from PO4 released during ikaite dissolution in the presence of biofilms. Increased Alk : DIC ratios in the lower ice and under-ice water suggested that ikaite dissolution buffered against meltwater dilution and enhanced the potential for atmospheric CO2 uptake. This study revealed strong seasonality in carbon and nutrient cycling in landfast sea ice and showed the importance of sea ice in biogeochemical cycling in seasonally ice-covered waters around Antarctica.
UR - http://www.scopus.com/inward/record.url?scp=85127034117&partnerID=8YFLogxK
U2 - 10.1002/lno.12260
DO - 10.1002/lno.12260
M3 - Article
AN - SCOPUS:85127034117
SN - 0024-3590
VL - 68
SP - 208
EP - 231
JO - Limnology and Oceanography
JF - Limnology and Oceanography
IS - 1
ER -