Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment
Ecosystem feedbacks in response to ocean acidification can amplify or diminish diel pH oscillations in productive coastal waters. Benthic microalgae generate such oscillations in sediment porewater and here we ask how CO₂ enrichment (acidification) of the overlying seawater alters these in the absen...
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ftunivwaikato:oai:researchcommons.waikato.ac.nz:10289/14724 2023-12-31T10:21:33+01:00 Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment Vopel, Kay Marshall, Alexis Brandt, Shelly Mia Marie Hartland, Adam Lee, Charles Kai-Wu Cary, S. Craig Pilditch, Conrad A. 2021 application/pdf https://hdl.handle.net/10289/14724 https://doi.org/10.1038/s41598-021-02314-y en eng Nature Portfolio Scientific Reports 2045-2322 https://hdl.handle.net/10289/14724 doi:10.1038/s41598-021-02314-y This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics PUTATIVE CARBONIC-ANHYDRASES 2 MARINE DIATOMS SATURATION STATE OXYGEN-UPTAKE SEA-WATER DISSOLUTION SEAWATER CO2 CHEMISTRY ACID Journal Article 2021 ftunivwaikato https://doi.org/10.1038/s41598-021-02314-y 2023-12-05T18:25:24Z Ecosystem feedbacks in response to ocean acidification can amplify or diminish diel pH oscillations in productive coastal waters. Benthic microalgae generate such oscillations in sediment porewater and here we ask how CO₂ enrichment (acidification) of the overlying seawater alters these in the absence and presence of biogenic calcite. We placed a 1-mm layer of ground oyster shells, mimicking the arrival of dead calcifying biota (+Calcite), or sand (Control) onto intact silt sediment cores, and then gradually increased the pCO₂ in the seawater above half of +Calcite and Control cores from 472 to 1216 μatm (pH 8.0 to 7.6, CO₂:HCO₃⁻ from 4.8 to 9.6 × 10⁻⁴). Porewater [O₂] and [H⁺] microprofiles measured 16 d later showed that this enrichment had decreased the O₂ penetration depth (O₂-pd) in +Calcite and Control, indicating a metabolic response. In CO₂-enriched seawater: (1) sediment biogeochemical processes respectively added and removed more H+ to and from the sediment porewater in darkness and light, than in ambient seawater increasing the amplitude of the diel porewater [H⁺] oscillations, and (2) in darkness, calcite dissolution in +Calcite sediment decreased the porewater [H⁺] below that in overlying seawater, reversing the sediment–seawater H⁺ flux and decreasing the amplitude of diel [H⁺] oscillations. This dissolution did not, however, counter the negative effect of CO₂ enrichment on O₂-pd. We now hypothesise that feedback to CO₂ enrichment—an increase in the microbial reoxidation of reduced solutes with O₂—decreased the sediment O₂-pd and contributed to the enhanced porewater acidification. Article in Journal/Newspaper Ocean acidification The University of Waikato: Research Commons Scientific Reports 11 1 |
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Open Polar |
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The University of Waikato: Research Commons |
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ftunivwaikato |
language |
English |
topic |
Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics PUTATIVE CARBONIC-ANHYDRASES 2 MARINE DIATOMS SATURATION STATE OXYGEN-UPTAKE SEA-WATER DISSOLUTION SEAWATER CO2 CHEMISTRY ACID |
spellingShingle |
Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics PUTATIVE CARBONIC-ANHYDRASES 2 MARINE DIATOMS SATURATION STATE OXYGEN-UPTAKE SEA-WATER DISSOLUTION SEAWATER CO2 CHEMISTRY ACID Vopel, Kay Marshall, Alexis Brandt, Shelly Mia Marie Hartland, Adam Lee, Charles Kai-Wu Cary, S. Craig Pilditch, Conrad A. Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment |
topic_facet |
Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics PUTATIVE CARBONIC-ANHYDRASES 2 MARINE DIATOMS SATURATION STATE OXYGEN-UPTAKE SEA-WATER DISSOLUTION SEAWATER CO2 CHEMISTRY ACID |
description |
Ecosystem feedbacks in response to ocean acidification can amplify or diminish diel pH oscillations in productive coastal waters. Benthic microalgae generate such oscillations in sediment porewater and here we ask how CO₂ enrichment (acidification) of the overlying seawater alters these in the absence and presence of biogenic calcite. We placed a 1-mm layer of ground oyster shells, mimicking the arrival of dead calcifying biota (+Calcite), or sand (Control) onto intact silt sediment cores, and then gradually increased the pCO₂ in the seawater above half of +Calcite and Control cores from 472 to 1216 μatm (pH 8.0 to 7.6, CO₂:HCO₃⁻ from 4.8 to 9.6 × 10⁻⁴). Porewater [O₂] and [H⁺] microprofiles measured 16 d later showed that this enrichment had decreased the O₂ penetration depth (O₂-pd) in +Calcite and Control, indicating a metabolic response. In CO₂-enriched seawater: (1) sediment biogeochemical processes respectively added and removed more H+ to and from the sediment porewater in darkness and light, than in ambient seawater increasing the amplitude of the diel porewater [H⁺] oscillations, and (2) in darkness, calcite dissolution in +Calcite sediment decreased the porewater [H⁺] below that in overlying seawater, reversing the sediment–seawater H⁺ flux and decreasing the amplitude of diel [H⁺] oscillations. This dissolution did not, however, counter the negative effect of CO₂ enrichment on O₂-pd. We now hypothesise that feedback to CO₂ enrichment—an increase in the microbial reoxidation of reduced solutes with O₂—decreased the sediment O₂-pd and contributed to the enhanced porewater acidification. |
format |
Article in Journal/Newspaper |
author |
Vopel, Kay Marshall, Alexis Brandt, Shelly Mia Marie Hartland, Adam Lee, Charles Kai-Wu Cary, S. Craig Pilditch, Conrad A. |
author_facet |
Vopel, Kay Marshall, Alexis Brandt, Shelly Mia Marie Hartland, Adam Lee, Charles Kai-Wu Cary, S. Craig Pilditch, Conrad A. |
author_sort |
Vopel, Kay |
title |
Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment |
title_short |
Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment |
title_full |
Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment |
title_fullStr |
Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment |
title_full_unstemmed |
Biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment |
title_sort |
biogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sediment |
publisher |
Nature Portfolio |
publishDate |
2021 |
url |
https://hdl.handle.net/10289/14724 https://doi.org/10.1038/s41598-021-02314-y |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Scientific Reports 2045-2322 https://hdl.handle.net/10289/14724 doi:10.1038/s41598-021-02314-y |
op_rights |
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
op_doi |
https://doi.org/10.1038/s41598-021-02314-y |
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Scientific Reports |
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