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...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035184 |
id |
ftnkunivathens:oai:lib.uoa.gr:uoadl:3035184 |
---|---|
record_format |
openpolar |
spelling |
ftnkunivathens:oai:lib.uoa.gr:uoadl:3035184 2024-02-11T10:07:24+01:00 Severe coastal hypoxia interchange with ocean acidification: An experimental perturbation study on carbon and nutrient biogeochemistry Kapetanaki, N. Krasakopoulou, E. Stathopoulou, E. Dassenakis, M. Scoullos, M. 2020-01-01 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035184 Αγγλικά English eng uoadl:3035184 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035184 scientific_publication_article Επιστημονική δημοσίευση - Άρθρο Περιοδικού Scientific publication - Journal Article 2020 ftnkunivathens 2024-01-18T19:00:51Z 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. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Article in Journal/Newspaper Ocean acidification Pergamos - Library and Information Center of National and Kapodistrian University of Athens |
institution |
Open Polar |
collection |
Pergamos - Library and Information Center of National and Kapodistrian University of Athens |
op_collection_id |
ftnkunivathens |
language |
English |
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. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. |
format |
Article in Journal/Newspaper |
author |
Kapetanaki, N. Krasakopoulou, E. Stathopoulou, E. Dassenakis, M. Scoullos, M. |
spellingShingle |
Kapetanaki, N. Krasakopoulou, E. Stathopoulou, E. Dassenakis, M. Scoullos, M. Severe coastal hypoxia interchange with ocean acidification: An experimental perturbation study on carbon and nutrient biogeochemistry |
author_facet |
Kapetanaki, N. Krasakopoulou, E. Stathopoulou, E. Dassenakis, M. Scoullos, M. |
author_sort |
Kapetanaki, N. |
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 |
publishDate |
2020 |
url |
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035184 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
uoadl:3035184 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3035184 |
_version_ |
1790605957533794304 |