Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry
Normally atmospheric CO2 is the major driver of ocean acidification (OA); however, local discharge/degradation of organic matter (OM) and redox reactions can exacerbate OA in coastal areas. In this work we study the response of nutrient and carbon systems to pH decrease in relation to hydrographical...
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ftmdpi:oai:mdpi.com:/2077-1312/8/6/462/ 2023-08-20T04:08:54+02:00 Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry Natalia Kapetanaki Evangelia Krasakopoulou Eleni Stathopoulou Manos Dassenakis Michael Scoullos agris 2020-06-23 application/pdf https://doi.org/10.3390/jmse8060462 EN eng Multidisciplinary Digital Publishing Institute Chemical Oceanography https://dx.doi.org/10.3390/jmse8060462 https://creativecommons.org/licenses/by/4.0/ Journal of Marine Science and Engineering; Volume 8; Issue 6; Pages: 462 CO 2 addition ocean acidification pH decline nitrification microcosm experiment anoxic sediment hypoxic/anoxic boundary Text 2020 ftmdpi https://doi.org/10.3390/jmse8060462 2023-07-31T23:40:47Z Normally atmospheric CO2 is the major driver of ocean acidification (OA); however, local discharge/degradation of organic matter (OM) and redox reactions can exacerbate OA in coastal areas. In this work we study the response of nutrient and carbon systems to pH decrease in relation to hydrographically induced intermittent characteristics and examine scenarios for future ocean acidification in a coastal system. Laboratory microcosm experiments were conducted using seawater and surface sediment collected from the deepest part of Elefsis Bay; the pH was constantly being monitored while CO2 gas addition was adjusted automatically. In Elefsis Bay surface pCO2 is already higher than global present atmospheric values, while near the bottom pCO2 reaches 1538 μatm and carbonate saturation states were calculated to be around 1.5. During the experiment, in more acidified conditions, limited alkalinity increase was observed and was correlated with the addition of bicarbonates and OM. Ammonium oxidation was decelerated and a nitrification mechanism was noticed, despite oxygen deficiency, paralleled by reduction of Mn-oxides. Phosphate was found significantly elevated for the first time in lower pH values, without reprecipitating after reoxygenation; this was linked with Fe(II) oxidation and Fe(III) reprecipitation without phosphate adsorption affecting both available dissolved phosphate and (dissolved inorganic nitrogen) DIN:DIP (dissolved inorganic phosphate)ratio. Text Ocean acidification MDPI Open Access Publishing Journal of Marine Science and Engineering 8 6 462 |
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MDPI Open Access Publishing |
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ftmdpi |
language |
English |
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CO 2 addition ocean acidification pH decline nitrification microcosm experiment anoxic sediment hypoxic/anoxic boundary |
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CO 2 addition ocean acidification pH decline nitrification microcosm experiment anoxic sediment hypoxic/anoxic boundary Natalia Kapetanaki Evangelia Krasakopoulou Eleni Stathopoulou Manos Dassenakis Michael Scoullos Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry |
topic_facet |
CO 2 addition ocean acidification pH decline nitrification microcosm experiment anoxic sediment hypoxic/anoxic boundary |
description |
Normally atmospheric CO2 is the major driver of ocean acidification (OA); however, local discharge/degradation of organic matter (OM) and redox reactions can exacerbate OA in coastal areas. In this work we study the response of nutrient and carbon systems to pH decrease in relation to hydrographically induced intermittent characteristics and examine scenarios for future ocean acidification in a coastal system. Laboratory microcosm experiments were conducted using seawater and surface sediment collected from the deepest part of Elefsis Bay; the pH was constantly being monitored while CO2 gas addition was adjusted automatically. In Elefsis Bay surface pCO2 is already higher than global present atmospheric values, while near the bottom pCO2 reaches 1538 μatm and carbonate saturation states were calculated to be around 1.5. During the experiment, in more acidified conditions, limited alkalinity increase was observed and was correlated with the addition of bicarbonates and OM. Ammonium oxidation was decelerated and a nitrification mechanism was noticed, despite oxygen deficiency, paralleled by reduction of Mn-oxides. Phosphate was found significantly elevated for the first time in lower pH values, without reprecipitating after reoxygenation; this was linked with Fe(II) oxidation and Fe(III) reprecipitation without phosphate adsorption affecting both available dissolved phosphate and (dissolved inorganic nitrogen) DIN:DIP (dissolved inorganic phosphate)ratio. |
format |
Text |
author |
Natalia Kapetanaki Evangelia Krasakopoulou Eleni Stathopoulou Manos Dassenakis Michael Scoullos |
author_facet |
Natalia Kapetanaki Evangelia Krasakopoulou Eleni Stathopoulou Manos Dassenakis Michael Scoullos |
author_sort |
Natalia Kapetanaki |
title |
Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry |
title_short |
Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry |
title_full |
Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry |
title_fullStr |
Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry |
title_full_unstemmed |
Severe Coastal Hypoxia Interchange with Ocean Acidification: An Experimental Perturbation Study on Carbon and Nutrient Biogeochemistry |
title_sort |
severe coastal hypoxia interchange with ocean acidification: an experimental perturbation study on carbon and nutrient biogeochemistry |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/jmse8060462 |
op_coverage |
agris |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Journal of Marine Science and Engineering; Volume 8; Issue 6; Pages: 462 |
op_relation |
Chemical Oceanography https://dx.doi.org/10.3390/jmse8060462 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/jmse8060462 |
container_title |
Journal of Marine Science and Engineering |
container_volume |
8 |
container_issue |
6 |
container_start_page |
462 |
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1774721484841811968 |