Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer
Abstract 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 c...
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crwiley:10.1002/lno.12260 2024-10-06T13:41:40+00:00 Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer Jones, Elizabeth M. Henley, Sian F. van Leeuwe, Maria A. Stefels, Jacqueline Meredith, Michael P. Fenton, Mairi Venables, Hugh J. Natural Environment Research Council Nederlandse Organisatie voor Wetenschappelijk Onderzoek 2022 http://dx.doi.org/10.1002/lno.12260 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12260 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12260 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12260 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 68, issue 1, page 208-231 ISSN 0024-3590 1939-5590 journal-article 2022 crwiley https://doi.org/10.1002/lno.12260 2024-09-23T04:35:40Z Abstract 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 (PO 4 ) 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 (NO 3 ) and DIC (< 165 μ mol kg −1 ) uptake occurred alongside substantial build‐up of algal biomass (746 μ g chlorophyll a L −1 ) and POC (6191 μ mol L −1 ) during summer. Silicic acid drawdown followed NO 3 depletion by approximately 1 month with a shift to diatom‐dominated communities. Accumulation of PO 4 in the lower ice layers in summer likely resulted from PO 4 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 CO 2 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. Article in Journal/Newspaper Adelaide Island Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice ice covered waters Wiley Online Library Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Antarctic Antarctic Peninsula Limnology and Oceanography 68 1 208 231 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract 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 (PO 4 ) 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 (NO 3 ) and DIC (< 165 μ mol kg −1 ) uptake occurred alongside substantial build‐up of algal biomass (746 μ g chlorophyll a L −1 ) and POC (6191 μ mol L −1 ) during summer. Silicic acid drawdown followed NO 3 depletion by approximately 1 month with a shift to diatom‐dominated communities. Accumulation of PO 4 in the lower ice layers in summer likely resulted from PO 4 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 CO 2 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. |
author2 |
Natural Environment Research Council Nederlandse Organisatie voor Wetenschappelijk Onderzoek |
format |
Article in Journal/Newspaper |
author |
Jones, Elizabeth M. Henley, Sian F. van Leeuwe, Maria A. Stefels, Jacqueline Meredith, Michael P. Fenton, Mairi Venables, Hugh J. |
spellingShingle |
Jones, Elizabeth M. Henley, Sian F. van Leeuwe, Maria A. Stefels, Jacqueline Meredith, Michael P. Fenton, Mairi Venables, Hugh J. Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer |
author_facet |
Jones, Elizabeth M. Henley, Sian F. van Leeuwe, Maria A. Stefels, Jacqueline Meredith, Michael P. Fenton, Mairi Venables, Hugh J. |
author_sort |
Jones, Elizabeth M. |
title |
Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer |
title_short |
Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer |
title_full |
Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer |
title_fullStr |
Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer |
title_full_unstemmed |
Carbon and nutrient cycling in Antarctic landfast sea ice from winter to summer |
title_sort |
carbon and nutrient cycling in antarctic landfast sea ice from winter to summer |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1002/lno.12260 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12260 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.12260 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12260 |
long_lat |
ENVELOPE(-68.914,-68.914,-67.762,-67.762) |
geographic |
Adelaide Island Antarctic Antarctic Peninsula |
geographic_facet |
Adelaide Island Antarctic Antarctic Peninsula |
genre |
Adelaide Island Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice ice covered waters |
genre_facet |
Adelaide Island Antarc* Antarctic Antarctic Peninsula Antarctica Sea ice ice covered waters |
op_source |
Limnology and Oceanography volume 68, issue 1, page 208-231 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12260 |
container_title |
Limnology and Oceanography |
container_volume |
68 |
container_issue |
1 |
container_start_page |
208 |
op_container_end_page |
231 |
_version_ |
1812176749401735168 |