Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean
Despite the important roles of shallow-water sediments in global biogeochemical cycling, the effects of ocean acidification on sedimentary processes have received relatively little attention. As high-latitude cold waters can absorb more CO2 and usually have a lower buffering capacity than warmer wat...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/309074 2023-07-23T04:17:22+02:00 Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean Gazeau, F. van Rijswijk, P. Pozzato, L. Middelburg, J.J. Bio-, hydro-, and environmental geochemistry Geochemistry 2014-04 application/pdf https://dspace.library.uu.nl/handle/1874/309074 en eng 1932-6203 https://dspace.library.uu.nl/handle/1874/309074 info:eu-repo/semantics/EmbargoedAccess Article 2014 ftunivutrecht 2023-07-02T01:15:28Z Despite the important roles of shallow-water sediments in global biogeochemical cycling, the effects of ocean acidification on sedimentary processes have received relatively little attention. As high-latitude cold waters can absorb more CO2 and usually have a lower buffering capacity than warmer waters, acidification rates in these areas are faster than those in sub-tropical regions. The present study investigates the effects of ocean acidification on sediment composition, processes and sediment-water fluxes in an Arctic coastal system. Undisturbed sediment cores, exempt of large dwelling organisms, were collected, incubated for a period of 14 days, and subject to a gradient of pCO2 covering the range of values projected for the end of the century. On five occasions during the experimental period, the sediment cores were isolated for flux measurements (oxygen, alkalinity, dissolved inorganic carbon, ammonium, nitrate, nitrite, phosphate and silicate). At the end of the experimental period, denitrification rates were measured and sediment samples were taken at several depth intervals for solid-phase analyses. Most of the parameters and processes (i.e. mineralization, denitrification) investigated showed no relationship with the overlying seawater pH, suggesting that ocean acidification will have limited impacts on the microbial activity and associated sediment-water fluxes on Arctic shelves, in the absence of active bio-irrigating organisms. Only following a pH decrease of 1 pH unit, not foreseen in the coming 300 years, significant enhancements of calcium carbonate dissolution and anammox rates were observed. Longer-term experiments on different sediment types are still required to confirm the limited impact of ocean acidification on shallow Arctic sediment processes as observed in this study. Article in Journal/Newspaper Arctic Arctic Ocean Ocean acidification Utrecht University Repository Arctic Arctic Ocean |
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Utrecht University Repository |
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ftunivutrecht |
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English |
description |
Despite the important roles of shallow-water sediments in global biogeochemical cycling, the effects of ocean acidification on sedimentary processes have received relatively little attention. As high-latitude cold waters can absorb more CO2 and usually have a lower buffering capacity than warmer waters, acidification rates in these areas are faster than those in sub-tropical regions. The present study investigates the effects of ocean acidification on sediment composition, processes and sediment-water fluxes in an Arctic coastal system. Undisturbed sediment cores, exempt of large dwelling organisms, were collected, incubated for a period of 14 days, and subject to a gradient of pCO2 covering the range of values projected for the end of the century. On five occasions during the experimental period, the sediment cores were isolated for flux measurements (oxygen, alkalinity, dissolved inorganic carbon, ammonium, nitrate, nitrite, phosphate and silicate). At the end of the experimental period, denitrification rates were measured and sediment samples were taken at several depth intervals for solid-phase analyses. Most of the parameters and processes (i.e. mineralization, denitrification) investigated showed no relationship with the overlying seawater pH, suggesting that ocean acidification will have limited impacts on the microbial activity and associated sediment-water fluxes on Arctic shelves, in the absence of active bio-irrigating organisms. Only following a pH decrease of 1 pH unit, not foreseen in the coming 300 years, significant enhancements of calcium carbonate dissolution and anammox rates were observed. Longer-term experiments on different sediment types are still required to confirm the limited impact of ocean acidification on shallow Arctic sediment processes as observed in this study. |
author2 |
Bio-, hydro-, and environmental geochemistry Geochemistry |
format |
Article in Journal/Newspaper |
author |
Gazeau, F. van Rijswijk, P. Pozzato, L. Middelburg, J.J. |
spellingShingle |
Gazeau, F. van Rijswijk, P. Pozzato, L. Middelburg, J.J. Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean |
author_facet |
Gazeau, F. van Rijswijk, P. Pozzato, L. Middelburg, J.J. |
author_sort |
Gazeau, F. |
title |
Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean |
title_short |
Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean |
title_full |
Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean |
title_fullStr |
Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean |
title_full_unstemmed |
Impacts of ocean acidification on sediment processes in shallow waters of the Arctic Ocean |
title_sort |
impacts of ocean acidification on sediment processes in shallow waters of the arctic ocean |
publishDate |
2014 |
url |
https://dspace.library.uu.nl/handle/1874/309074 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Ocean acidification |
genre_facet |
Arctic Arctic Ocean Ocean acidification |
op_relation |
1932-6203 https://dspace.library.uu.nl/handle/1874/309074 |
op_rights |
info:eu-repo/semantics/EmbargoedAccess |
_version_ |
1772178979355099136 |