Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry
Naturally occurring microbial decomposition of organic matter (OM) in coastal marine environments cause increased acidity in deeper layers similar or even exceeding the future predictions for global ocean acidification (OA). Experimental studies in coastal areas characterized by increased inputs of...
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Hellenic Centre for Marine Research
2018
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Online Access: | https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/14439 https://doi.org/10.12681/mms.14439 |
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ftektojs:oai:ejournals.epublishing.ekt.gr:article/14439 2023-05-15T17:51:44+02:00 Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry KAPETANAKI, NATALIA KRASAKOPOULOU, EVANGELIA STATHOPOULOU, ELENI PAVLIDOU, ALEXANDRA ZERVOUDAKI, SOULTANA DASSENAKIS, MANOS SCOULLOS, MICHAEL National and Kapodistrian University of Athens, Department of Chemistry, Laboratory of Environmental Chemistry Hellenic Centre for Marine Research, Institute of Oceanography Mediterranean Sea, Elefsis Bay 2014 water; sediments 2018-06-28 application/pdf https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/14439 https://doi.org/10.12681/mms.14439 eng eng Hellenic Centre for Marine Research https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/14439/15651 https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/14439 doi:10.12681/mms.14439 Copyright (c) 2018 Mediterranean Marine Science Mediterranean Marine Science; Vol 19, No 2 (2018); 290-304 1791-6763 1108-393X Carbonate chemistry carbon nitrogen phosphorus microcosm experiment Ocean acidification coastal ocean sediment info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Experimental Study 2018 ftektojs https://doi.org/10.12681/mms.14439 2022-01-09T20:24:54Z Naturally occurring microbial decomposition of organic matter (OM) in coastal marine environments cause increased acidity in deeper layers similar or even exceeding the future predictions for global ocean acidification (OA). Experimental studies in coastal areas characterized by increased inputs of OM and nutrients, coping with intermittent hypoxic/anoxic conditions, provide better understanding of the mechanisms affecting nutrients and carbon biogeochemistry under the emerging effects of coastal pH decrease. Laboratory CO2-manipulated microcosm experiments were conducted using seawater and surface sediment collected from the deepest part of Elefsis Bay (Saronikos Gulf, Eastern Mediterranean) focusing to study the co-evolution of processes affected by the decline of dissolved oxygen and pH induced by (a) OM remineralization and (b) the future anthropogenic increase of atmospheric CO2. Under more acidified conditions, a significant increase of total alkalinity was observed partially attributed to the sedimentary carbonate dissolution and the reactive nitrogen species shift towards ammonium. Νitrate and nitrite decline, in parallel with ammonium increase, demonstrated a deceleration of ammonium oxidation processes along with decrease in nitrate production. The decreased DIN:DIP ratio, the prevalence of organic nutrient species against the inorganic ones, the observations of constrained DON degradation and nitrate production decline and the higher DOC concentrations revealed the possible inhibition of OM decomposition under lower pH values. Finally, our results highlight the need for detailed studies of the carbonate system in coastal areas dominated by hypoxic/anoxic conditions, accompanied by other biogeochemical parameters and properly designed experiments to elucidate the processes sequence or alterations due to pH reduction. Article in Journal/Newspaper Ocean acidification EKT ePublishing (National Documentation Centre, Greece) Mediterranean Marine Science 290 |
institution |
Open Polar |
collection |
EKT ePublishing (National Documentation Centre, Greece) |
op_collection_id |
ftektojs |
language |
English |
topic |
Carbonate chemistry carbon nitrogen phosphorus microcosm experiment Ocean acidification coastal ocean sediment |
spellingShingle |
Carbonate chemistry carbon nitrogen phosphorus microcosm experiment Ocean acidification coastal ocean sediment KAPETANAKI, NATALIA KRASAKOPOULOU, EVANGELIA STATHOPOULOU, ELENI PAVLIDOU, ALEXANDRA ZERVOUDAKI, SOULTANA DASSENAKIS, MANOS SCOULLOS, MICHAEL Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry |
topic_facet |
Carbonate chemistry carbon nitrogen phosphorus microcosm experiment Ocean acidification coastal ocean sediment |
description |
Naturally occurring microbial decomposition of organic matter (OM) in coastal marine environments cause increased acidity in deeper layers similar or even exceeding the future predictions for global ocean acidification (OA). Experimental studies in coastal areas characterized by increased inputs of OM and nutrients, coping with intermittent hypoxic/anoxic conditions, provide better understanding of the mechanisms affecting nutrients and carbon biogeochemistry under the emerging effects of coastal pH decrease. Laboratory CO2-manipulated microcosm experiments were conducted using seawater and surface sediment collected from the deepest part of Elefsis Bay (Saronikos Gulf, Eastern Mediterranean) focusing to study the co-evolution of processes affected by the decline of dissolved oxygen and pH induced by (a) OM remineralization and (b) the future anthropogenic increase of atmospheric CO2. Under more acidified conditions, a significant increase of total alkalinity was observed partially attributed to the sedimentary carbonate dissolution and the reactive nitrogen species shift towards ammonium. Νitrate and nitrite decline, in parallel with ammonium increase, demonstrated a deceleration of ammonium oxidation processes along with decrease in nitrate production. The decreased DIN:DIP ratio, the prevalence of organic nutrient species against the inorganic ones, the observations of constrained DON degradation and nitrate production decline and the higher DOC concentrations revealed the possible inhibition of OM decomposition under lower pH values. Finally, our results highlight the need for detailed studies of the carbonate system in coastal areas dominated by hypoxic/anoxic conditions, accompanied by other biogeochemical parameters and properly designed experiments to elucidate the processes sequence or alterations due to pH reduction. |
author2 |
National and Kapodistrian University of Athens, Department of Chemistry, Laboratory of Environmental Chemistry Hellenic Centre for Marine Research, Institute of Oceanography |
format |
Article in Journal/Newspaper |
author |
KAPETANAKI, NATALIA KRASAKOPOULOU, EVANGELIA STATHOPOULOU, ELENI PAVLIDOU, ALEXANDRA ZERVOUDAKI, SOULTANA DASSENAKIS, MANOS SCOULLOS, MICHAEL |
author_facet |
KAPETANAKI, NATALIA KRASAKOPOULOU, EVANGELIA STATHOPOULOU, ELENI PAVLIDOU, ALEXANDRA ZERVOUDAKI, SOULTANA DASSENAKIS, MANOS SCOULLOS, MICHAEL |
author_sort |
KAPETANAKI, NATALIA |
title |
Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry |
title_short |
Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry |
title_full |
Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry |
title_fullStr |
Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry |
title_full_unstemmed |
Simulation of Coastal Processes affecting pH with Impacts on Carbon and Nutrient Biogeochemistry |
title_sort |
simulation of coastal processes affecting ph with impacts on carbon and nutrient biogeochemistry |
publisher |
Hellenic Centre for Marine Research |
publishDate |
2018 |
url |
https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/14439 https://doi.org/10.12681/mms.14439 |
op_coverage |
Mediterranean Sea, Elefsis Bay 2014 water; sediments |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Mediterranean Marine Science; Vol 19, No 2 (2018); 290-304 1791-6763 1108-393X |
op_relation |
https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/14439/15651 https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/14439 doi:10.12681/mms.14439 |
op_rights |
Copyright (c) 2018 Mediterranean Marine Science |
op_doi |
https://doi.org/10.12681/mms.14439 |
container_title |
Mediterranean Marine Science |
container_start_page |
290 |
_version_ |
1766158965422424064 |