Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019)
International audience Abstract. The decadal changes of the fugacity of CO2 (fCO2) and pH in surface waters are investigated in the Southern Indian Ocean (45° S–57° S) using repeated summer observations, including measurements of fCO2, total alkalinity (AT) and total carbon (CT) collected over the p...
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Online Access: | https://hal.science/hal-03607289 https://hal.science/hal-03607289/document https://hal.science/hal-03607289/file/bg-19-2599-2022.pdf https://doi.org/10.5194/bg-2022-22 |
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Open Polar |
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HAL de l'Institut Polytechnique de Paris |
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ftinspolytechpar |
language |
English |
topic |
[SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.MCG]Environmental Sciences/Global Changes Leseurre, Coraline Lo Monaco, Claire Reverdin, Gilles Metzl, Nicolas Fin, Jonathan Mignon, Claude Benito, Léa Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019) |
topic_facet |
[SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Abstract. The decadal changes of the fugacity of CO2 (fCO2) and pH in surface waters are investigated in the Southern Indian Ocean (45° S–57° S) using repeated summer observations, including measurements of fCO2, total alkalinity (AT) and total carbon (CT) collected over the period 1998–2019 in the frame of the French monitoring program OISO. We used three datasets (underway fCO2, underway AT-CT and station AT-CT) to evaluate the trends of fCO2 and pH and their drivers, including the accumulation of anthropogenic CO2 (Cant). The study region is separated into three domains based on the frontal system and biogeochemical characteristics: (i) High Nutrients Low Chlorophyll (HNLC) waters in the Polar Front Zone (PFZ), (ii) HNLC waters south of the Polar Front (PF) and (iii) the highly productive zones in fertilized waters near Crozet and Kerguelen Islands. Almost everywhere, we obtained similar trends in surface fCO2 and pH using the fCO2 or AT-CT datasets. Over the period 1998–2019, we observed an increase in surface fCO2 and a decrease in pH ranging from +1.0 to +4.0 µatm yr−1 and from −0.0015 to −0.0043 yr−1, respectively. South of the PF, the fCO2 trend is close to the atmospheric CO2 rise (+2.0 µatm yr−1) and the decrease in pH is in the range of the mean trend for the global ocean (around −0.0020 yr−1); these trends are driven by the warming of surface waters (up to +0.04 °C yr−1) and the increase in CT, mainly due to the accumulation of Cant (around +0.6 µmol kg−1 yr−1). In the PFZ, our data show slower fCO2 and pH trends (around +1.3 µatm yr−1 and −0.0013 yr−1, respectively) associated with an increase in AT (around +0.4 µmol kg−1 yr−1) that limited the impact of a more rapid accumulation of Cant north of the PF (up to +1.1 µmol kg−1 yr−1). In the fertilized waters near Crozet and Kerguelen Islands, fCO2 increased and pH decreased faster than in the other domains, between +2.2 and +4.0 µatm yr−1 and between −0.0023 yr−1 and −0.0043 yr−1. The fastest trends of fCO2 and pH are found ... |
author2 |
Cycles biogéochimiques marins : processus et perturbations (CYBIOM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Processus et interactions de fine échelle océanique (PROTEO) LEFE-INSU programme KER-Trend |
format |
Article in Journal/Newspaper |
author |
Leseurre, Coraline Lo Monaco, Claire Reverdin, Gilles Metzl, Nicolas Fin, Jonathan Mignon, Claude Benito, Léa |
author_facet |
Leseurre, Coraline Lo Monaco, Claire Reverdin, Gilles Metzl, Nicolas Fin, Jonathan Mignon, Claude Benito, Léa |
author_sort |
Leseurre, Coraline |
title |
Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019) |
title_short |
Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019) |
title_full |
Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019) |
title_fullStr |
Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019) |
title_full_unstemmed |
Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019) |
title_sort |
trends and drivers of sea surface fco2 and ph changes observed in the southern indian ocean over the last two decades (1998–2019) |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03607289 https://hal.science/hal-03607289/document https://hal.science/hal-03607289/file/bg-19-2599-2022.pdf https://doi.org/10.5194/bg-2022-22 |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-03607289 Biogeosciences, 2022, 19, pp.2599-2625. ⟨10.5194/bg-2022-22⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-2022-22 hal-03607289 https://hal.science/hal-03607289 https://hal.science/hal-03607289/document https://hal.science/hal-03607289/file/bg-19-2599-2022.pdf doi:10.5194/bg-2022-22 WOS: 000799842000001 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-2022-22 |
_version_ |
1799483111703052288 |
spelling |
ftinspolytechpar:oai:HAL:hal-03607289v1 2024-05-19T07:43:23+00:00 Trends and drivers of sea surface fCO2 and pH changes observed in the Southern Indian Ocean over the last two decades (1998–2019) Leseurre, Coraline Lo Monaco, Claire Reverdin, Gilles Metzl, Nicolas Fin, Jonathan Mignon, Claude Benito, Léa Cycles biogéochimiques marins : processus et perturbations (CYBIOM) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Processus et interactions de fine échelle océanique (PROTEO) LEFE-INSU programme KER-Trend 2022 https://hal.science/hal-03607289 https://hal.science/hal-03607289/document https://hal.science/hal-03607289/file/bg-19-2599-2022.pdf https://doi.org/10.5194/bg-2022-22 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-2022-22 hal-03607289 https://hal.science/hal-03607289 https://hal.science/hal-03607289/document https://hal.science/hal-03607289/file/bg-19-2599-2022.pdf doi:10.5194/bg-2022-22 WOS: 000799842000001 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-03607289 Biogeosciences, 2022, 19, pp.2599-2625. ⟨10.5194/bg-2022-22⟩ [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2022 ftinspolytechpar https://doi.org/10.5194/bg-2022-22 2024-04-22T01:47:30Z International audience Abstract. The decadal changes of the fugacity of CO2 (fCO2) and pH in surface waters are investigated in the Southern Indian Ocean (45° S–57° S) using repeated summer observations, including measurements of fCO2, total alkalinity (AT) and total carbon (CT) collected over the period 1998–2019 in the frame of the French monitoring program OISO. We used three datasets (underway fCO2, underway AT-CT and station AT-CT) to evaluate the trends of fCO2 and pH and their drivers, including the accumulation of anthropogenic CO2 (Cant). The study region is separated into three domains based on the frontal system and biogeochemical characteristics: (i) High Nutrients Low Chlorophyll (HNLC) waters in the Polar Front Zone (PFZ), (ii) HNLC waters south of the Polar Front (PF) and (iii) the highly productive zones in fertilized waters near Crozet and Kerguelen Islands. Almost everywhere, we obtained similar trends in surface fCO2 and pH using the fCO2 or AT-CT datasets. Over the period 1998–2019, we observed an increase in surface fCO2 and a decrease in pH ranging from +1.0 to +4.0 µatm yr−1 and from −0.0015 to −0.0043 yr−1, respectively. South of the PF, the fCO2 trend is close to the atmospheric CO2 rise (+2.0 µatm yr−1) and the decrease in pH is in the range of the mean trend for the global ocean (around −0.0020 yr−1); these trends are driven by the warming of surface waters (up to +0.04 °C yr−1) and the increase in CT, mainly due to the accumulation of Cant (around +0.6 µmol kg−1 yr−1). In the PFZ, our data show slower fCO2 and pH trends (around +1.3 µatm yr−1 and −0.0013 yr−1, respectively) associated with an increase in AT (around +0.4 µmol kg−1 yr−1) that limited the impact of a more rapid accumulation of Cant north of the PF (up to +1.1 µmol kg−1 yr−1). In the fertilized waters near Crozet and Kerguelen Islands, fCO2 increased and pH decreased faster than in the other domains, between +2.2 and +4.0 µatm yr−1 and between −0.0023 yr−1 and −0.0043 yr−1. The fastest trends of fCO2 and pH are found ... Article in Journal/Newspaper Kerguelen Islands HAL de l'Institut Polytechnique de Paris |