The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions
Alongside climate change, anthropogenic emissions of CO2 will cause ocean acidification (OA), which will impact upon key biogeochemical processes in the ocean such as net primary production (NPP), carbon export (CEX), N2 fixation (NFIX), denitrification (DENIT), and ocean suboxia (SOX). However, app...
Published in: | Global Biogeochemical Cycles |
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American Geophysical Union
2011
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ftoskarbordeaux:oai:oskar-bordeaux.fr:20.500.12278/30370 2023-05-15T17:50:48+02:00 The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions TAGLIABUE, Alessandro BOPP, Laurent GEHLEN, Marion 2011 https://oskar-bordeaux.fr/handle/20.500.12278/30370 https://doi.org/10.1029/2010GB003929 en eng American Geophysical Union 0886-6236 https://oskar-bordeaux.fr/handle/20.500.12278/30370 doi:10.1029/2010GB003929 Planète et Univers [physics]/Océan Atmosphère Article de revue 2011 ftoskarbordeaux https://doi.org/10.1029/2010GB003929 2021-05-11T22:31:37Z Alongside climate change, anthropogenic emissions of CO2 will cause ocean acidification (OA), which will impact upon key biogeochemical processes in the ocean such as net primary production (NPP), carbon export (CEX), N2 fixation (NFIX), denitrification (DENIT), and ocean suboxia (SOX). However, appraising the impact of OA on marine biogeochemical cycles requires ocean general circulation and biogeochemistry models (OGCBMs) that necessitate a number of assumptions regarding the response of phytoplankton physiological processes to OA. Of particular importance are changes in C:N:P stoichiometry, which cannot be accounted for in current generation OGCBMs that rely on fixed Redfield C:N:P ratios. We developed a new version of the PISCES OGCBM that resolves the cycles of C, N, and P independently to investigate the impact of assumptions that OA (1) enhances NPP, (2) enhances losses of fixed carbon in dissolved organic forms, and (3) modifies the uptake of nutrients by phytoplankton. In total, six simulations were performed over the period 1860–2100. We find that while the prescribed “CO2 sensitivity” of rate processes explains the NPP response, there are large uncertainties in the response of CEX, NFIX, DENIT, and SOX related to assumptions regarding the fate of fixed carbon and nutrient uptake. The overall responses of NPP and CEX are opposite and of similar magnitude to those predicted to occur from climate change alone, suggesting that changes in stoichiometry and NPP in response to OA (and probably also climate change) need to be evaluated in non‐Redfield coupled‐climate OGCBMs. Using a recent synthesis of OA experiments, it was not possible to evaluate whether one or more of our scenarios was most likely. Future coupled experimental modeling approaches are necessary to better understand the impact of OA on ocean biogeochemistry Other/Unknown Material Ocean acidification OSKAR Bordeaux (Open Science Knowledge ARchive) Global Biogeochemical Cycles 25 3 n/a n/a |
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Open Polar |
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OSKAR Bordeaux (Open Science Knowledge ARchive) |
op_collection_id |
ftoskarbordeaux |
language |
English |
topic |
Planète et Univers [physics]/Océan Atmosphère |
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Planète et Univers [physics]/Océan Atmosphère TAGLIABUE, Alessandro BOPP, Laurent GEHLEN, Marion The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions |
topic_facet |
Planète et Univers [physics]/Océan Atmosphère |
description |
Alongside climate change, anthropogenic emissions of CO2 will cause ocean acidification (OA), which will impact upon key biogeochemical processes in the ocean such as net primary production (NPP), carbon export (CEX), N2 fixation (NFIX), denitrification (DENIT), and ocean suboxia (SOX). However, appraising the impact of OA on marine biogeochemical cycles requires ocean general circulation and biogeochemistry models (OGCBMs) that necessitate a number of assumptions regarding the response of phytoplankton physiological processes to OA. Of particular importance are changes in C:N:P stoichiometry, which cannot be accounted for in current generation OGCBMs that rely on fixed Redfield C:N:P ratios. We developed a new version of the PISCES OGCBM that resolves the cycles of C, N, and P independently to investigate the impact of assumptions that OA (1) enhances NPP, (2) enhances losses of fixed carbon in dissolved organic forms, and (3) modifies the uptake of nutrients by phytoplankton. In total, six simulations were performed over the period 1860–2100. We find that while the prescribed “CO2 sensitivity” of rate processes explains the NPP response, there are large uncertainties in the response of CEX, NFIX, DENIT, and SOX related to assumptions regarding the fate of fixed carbon and nutrient uptake. The overall responses of NPP and CEX are opposite and of similar magnitude to those predicted to occur from climate change alone, suggesting that changes in stoichiometry and NPP in response to OA (and probably also climate change) need to be evaluated in non‐Redfield coupled‐climate OGCBMs. Using a recent synthesis of OA experiments, it was not possible to evaluate whether one or more of our scenarios was most likely. Future coupled experimental modeling approaches are necessary to better understand the impact of OA on ocean biogeochemistry |
format |
Other/Unknown Material |
author |
TAGLIABUE, Alessandro BOPP, Laurent GEHLEN, Marion |
author_facet |
TAGLIABUE, Alessandro BOPP, Laurent GEHLEN, Marion |
author_sort |
TAGLIABUE, Alessandro |
title |
The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions |
title_short |
The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions |
title_full |
The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions |
title_fullStr |
The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions |
title_full_unstemmed |
The response of marine carbon and nutrient cycles to ocean acidification: Large uncertainties related to phytoplankton physiological assumptions |
title_sort |
response of marine carbon and nutrient cycles to ocean acidification: large uncertainties related to phytoplankton physiological assumptions |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
https://oskar-bordeaux.fr/handle/20.500.12278/30370 https://doi.org/10.1029/2010GB003929 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
0886-6236 https://oskar-bordeaux.fr/handle/20.500.12278/30370 doi:10.1029/2010GB003929 |
op_doi |
https://doi.org/10.1029/2010GB003929 |
container_title |
Global Biogeochemical Cycles |
container_volume |
25 |
container_issue |
3 |
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n/a |
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n/a |
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1766157712316432384 |