Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea
International audience Coastal time series of ocean carbonate chemistry are critical for understanding how global anthropogenic change manifests in near-shore ecosystems. Yet, they are few and have low temporal resolution. At the time series station Point B in the northwestern Mediterranean Sea, sea...
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ftsorbonneuniv:oai:HAL:hal-01534516v1 2023-06-11T04:15:39+02:00 Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea Kapsenberg, Lydia Alliouane, Samir Gazeau, Frédéric Mousseau, Laure Gattuso, Jean-Pierre Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute for Sustainable Development and International Relations Sciences Po (Sciences Po) 2017 https://hal.sorbonne-universite.fr/hal-01534516 https://hal.sorbonne-universite.fr/hal-01534516/document https://hal.sorbonne-universite.fr/hal-01534516/file/os-13-411-2017.pdf https://doi.org/10.5194/os-13-411-2017 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/os-13-411-2017 hal-01534516 https://hal.sorbonne-universite.fr/hal-01534516 https://hal.sorbonne-universite.fr/hal-01534516/document https://hal.sorbonne-universite.fr/hal-01534516/file/os-13-411-2017.pdf doi:10.5194/os-13-411-2017 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.sorbonne-universite.fr/hal-01534516 Ocean Science, 2017, 13 (3), pp.411-426. ⟨10.5194/os-13-411-2017⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2017 ftsorbonneuniv https://doi.org/10.5194/os-13-411-2017 2023-05-29T23:19:26Z International audience Coastal time series of ocean carbonate chemistry are critical for understanding how global anthropogenic change manifests in near-shore ecosystems. Yet, they are few and have low temporal resolution. At the time series station Point B in the northwestern Mediterranean Sea, seawater was sampled weekly from 2007 through 2015, at 1 and 50 m, and analyzed for total dissolved inorganic carbon (C T) and total alkalinity (A T). Parameters of the carbonate system such as pH (pH T , total hydrogen ion scale) were calculated and a deconvolution analysis was performed to identify drivers of change. The rate of surface ocean acidification was −0.0028 ± 0.0003 units pH T yr −1. This rate is larger than previously identified open-ocean trends due to rapid warming that occurred over the study period (0.072 ± 0.022 • C yr −1). The total pH T change over the study period was of similar magnitude as the diel pH T variability at this site. The acidification trend can be attributed to atmospheric carbon dioxide (CO 2) forcing (59 %, 2.08 ± 0.01 ppm CO 2 yr −1) and warming (41 %). Similar trends were observed at 50 m but rates were generally slower. At 1 m depth, the increase in atmospheric CO 2 accounted for approximately 40 % of the observed increase in C T (2.97 ± 0.20 µmol kg −1 yr −1). The remaining increase in C T may have been driven by the same unidentified process that caused an increase in A T (2.08 ± 0.19 µmol kg −1 yr −1). Based on the analysis of monthly trends, synchronous increases in C T and A T were fastest in the spring–summer transition. The driving process of the interannual increase in A T has a seasonal and shallow component, which may indicate riverine or groundwater influence. This study exemplifies the importance of understanding changes in coastal carbonate chemistry through the lens of biogeochemical cycling at the land–sea interface. This is the first coastal acidification time series providing multi-year data at high temporal resolution. The data confirm rapid warming in the ... Article in Journal/Newspaper Ocean acidification HAL Sorbonne Université Ocean Science 13 3 411 426 |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Kapsenberg, Lydia Alliouane, Samir Gazeau, Frédéric Mousseau, Laure Gattuso, Jean-Pierre Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Coastal time series of ocean carbonate chemistry are critical for understanding how global anthropogenic change manifests in near-shore ecosystems. Yet, they are few and have low temporal resolution. At the time series station Point B in the northwestern Mediterranean Sea, seawater was sampled weekly from 2007 through 2015, at 1 and 50 m, and analyzed for total dissolved inorganic carbon (C T) and total alkalinity (A T). Parameters of the carbonate system such as pH (pH T , total hydrogen ion scale) were calculated and a deconvolution analysis was performed to identify drivers of change. The rate of surface ocean acidification was −0.0028 ± 0.0003 units pH T yr −1. This rate is larger than previously identified open-ocean trends due to rapid warming that occurred over the study period (0.072 ± 0.022 • C yr −1). The total pH T change over the study period was of similar magnitude as the diel pH T variability at this site. The acidification trend can be attributed to atmospheric carbon dioxide (CO 2) forcing (59 %, 2.08 ± 0.01 ppm CO 2 yr −1) and warming (41 %). Similar trends were observed at 50 m but rates were generally slower. At 1 m depth, the increase in atmospheric CO 2 accounted for approximately 40 % of the observed increase in C T (2.97 ± 0.20 µmol kg −1 yr −1). The remaining increase in C T may have been driven by the same unidentified process that caused an increase in A T (2.08 ± 0.19 µmol kg −1 yr −1). Based on the analysis of monthly trends, synchronous increases in C T and A T were fastest in the spring–summer transition. The driving process of the interannual increase in A T has a seasonal and shallow component, which may indicate riverine or groundwater influence. This study exemplifies the importance of understanding changes in coastal carbonate chemistry through the lens of biogeochemical cycling at the land–sea interface. This is the first coastal acidification time series providing multi-year data at high temporal resolution. The data confirm rapid warming in the ... |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Institute for Sustainable Development and International Relations Sciences Po (Sciences Po) |
format |
Article in Journal/Newspaper |
author |
Kapsenberg, Lydia Alliouane, Samir Gazeau, Frédéric Mousseau, Laure Gattuso, Jean-Pierre |
author_facet |
Kapsenberg, Lydia Alliouane, Samir Gazeau, Frédéric Mousseau, Laure Gattuso, Jean-Pierre |
author_sort |
Kapsenberg, Lydia |
title |
Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea |
title_short |
Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea |
title_full |
Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea |
title_fullStr |
Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea |
title_full_unstemmed |
Coastal ocean acidification and increasing total alkalinity in the northwestern Mediterranean Sea |
title_sort |
coastal ocean acidification and increasing total alkalinity in the northwestern mediterranean sea |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.sorbonne-universite.fr/hal-01534516 https://hal.sorbonne-universite.fr/hal-01534516/document https://hal.sorbonne-universite.fr/hal-01534516/file/os-13-411-2017.pdf https://doi.org/10.5194/os-13-411-2017 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 1812-0784 EISSN: 1812-0792 Ocean Science https://hal.sorbonne-universite.fr/hal-01534516 Ocean Science, 2017, 13 (3), pp.411-426. ⟨10.5194/os-13-411-2017⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/os-13-411-2017 hal-01534516 https://hal.sorbonne-universite.fr/hal-01534516 https://hal.sorbonne-universite.fr/hal-01534516/document https://hal.sorbonne-universite.fr/hal-01534516/file/os-13-411-2017.pdf doi:10.5194/os-13-411-2017 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/os-13-411-2017 |
container_title |
Ocean Science |
container_volume |
13 |
container_issue |
3 |
container_start_page |
411 |
op_container_end_page |
426 |
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1768372627658768384 |