Calcium carbonate saturation states along the West Antarctic Peninsula
Abstract The waters along the West Antarctic Peninsula (WAP) have experienced warming and increased freshwater inputs from melting sea ice and glaciers in recent decades. Challenges exist in understanding the consequences of these changes on the inorganic carbon system in this ecologically important...
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crcambridgeupr:10.1017/s0954102021000456 2024-10-13T14:02:25+00:00 Calcium carbonate saturation states along the West Antarctic Peninsula Jones, Elizabeth M. Hoppema, Mario Bakker, Karel de Baar, Hein J.W. European Community’s Seventh Framework Programme 2021 http://dx.doi.org/10.1017/s0954102021000456 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102021000456 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 33, issue 6, page 575-595 ISSN 0954-1020 1365-2079 journal-article 2021 crcambridgeupr https://doi.org/10.1017/s0954102021000456 2024-09-25T04:02:47Z Abstract The waters along the West Antarctic Peninsula (WAP) have experienced warming and increased freshwater inputs from melting sea ice and glaciers in recent decades. Challenges exist in understanding the consequences of these changes on the inorganic carbon system in this ecologically important and highly productive ecosystem. Distributions of dissolved inorganic carbon (C T ), total alkalinity (A T ) and nutrients revealed key physical, biological and biogeochemical controls of the calcium carbonate saturation state (Ω aragonite ) in different water masses across the WAP shelf during the summer. Biological production in spring and summer dominated changes in surface water Ω aragonite (ΔΩ aragonite up to +1.39; ~ 90%) relative to underlying Winter Water. Sea-ice and glacial meltwater constituted a minor source of A T that increased surface water Ω aragonite (ΔΩ aragonite up to +0.07; ~ 13%). Remineralization of organic matter and an influx of carbon-rich brines led to cross-shelf decreases in Ω aragonite in Winter Water and Circumpolar Deep Water. A strong biological carbon pump over the shelf created Ω aragonite oversaturation in surface waters and suppression of Ω aragonite in subsurface waters. Undersaturation of aragonite occurred at < ~1000 m. Ongoing changes along the WAP will impact the biologically driven and meltwater-driven processes that influence the vulnerability of shelf waters to calcium carbonate undersaturation in the future. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Sea ice Cambridge University Press Antarctic Antarctic Peninsula Antarctic Science 1 21 |
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Open Polar |
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Cambridge University Press |
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English |
description |
Abstract The waters along the West Antarctic Peninsula (WAP) have experienced warming and increased freshwater inputs from melting sea ice and glaciers in recent decades. Challenges exist in understanding the consequences of these changes on the inorganic carbon system in this ecologically important and highly productive ecosystem. Distributions of dissolved inorganic carbon (C T ), total alkalinity (A T ) and nutrients revealed key physical, biological and biogeochemical controls of the calcium carbonate saturation state (Ω aragonite ) in different water masses across the WAP shelf during the summer. Biological production in spring and summer dominated changes in surface water Ω aragonite (ΔΩ aragonite up to +1.39; ~ 90%) relative to underlying Winter Water. Sea-ice and glacial meltwater constituted a minor source of A T that increased surface water Ω aragonite (ΔΩ aragonite up to +0.07; ~ 13%). Remineralization of organic matter and an influx of carbon-rich brines led to cross-shelf decreases in Ω aragonite in Winter Water and Circumpolar Deep Water. A strong biological carbon pump over the shelf created Ω aragonite oversaturation in surface waters and suppression of Ω aragonite in subsurface waters. Undersaturation of aragonite occurred at < ~1000 m. Ongoing changes along the WAP will impact the biologically driven and meltwater-driven processes that influence the vulnerability of shelf waters to calcium carbonate undersaturation in the future. |
author2 |
European Community’s Seventh Framework Programme |
format |
Article in Journal/Newspaper |
author |
Jones, Elizabeth M. Hoppema, Mario Bakker, Karel de Baar, Hein J.W. |
spellingShingle |
Jones, Elizabeth M. Hoppema, Mario Bakker, Karel de Baar, Hein J.W. Calcium carbonate saturation states along the West Antarctic Peninsula |
author_facet |
Jones, Elizabeth M. Hoppema, Mario Bakker, Karel de Baar, Hein J.W. |
author_sort |
Jones, Elizabeth M. |
title |
Calcium carbonate saturation states along the West Antarctic Peninsula |
title_short |
Calcium carbonate saturation states along the West Antarctic Peninsula |
title_full |
Calcium carbonate saturation states along the West Antarctic Peninsula |
title_fullStr |
Calcium carbonate saturation states along the West Antarctic Peninsula |
title_full_unstemmed |
Calcium carbonate saturation states along the West Antarctic Peninsula |
title_sort |
calcium carbonate saturation states along the west antarctic peninsula |
publisher |
Cambridge University Press (CUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1017/s0954102021000456 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102021000456 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Sea ice |
op_source |
Antarctic Science volume 33, issue 6, page 575-595 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102021000456 |
container_title |
Antarctic Science |
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1 |
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21 |
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1812817119279054848 |