Boron isotopes in Fiji corals and precise ocean acidification reconstruction
International audience Within the framework of EPOCA (European Project on OCean Acidification ) and the French INSU project PHARE, we are adapting the boron isotope technique to ancient corals with the scope to reconstruct “past” ocean pH changes. In this study, we applied the technique to surface s...
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ftccsdartic:oai:HAL:hal-04113499v1 2023-12-17T10:47:59+01:00 Boron isotopes in Fiji corals and precise ocean acidification reconstruction Douville, E. Juillet-Leclerc, A. Cabioch, G. Louvat, P. Gaillardet, J. Gehlen, M. Bopp, L. Paterne, M. Laboratoire des Sciences du Climat et de l'Environnement (LSCE) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Institut de Recherche pour le Développement (IRD) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) à renseigner, Unknown Region 2023-06-01 https://hal.science/hal-04113499 en eng HAL CCSD hal-04113499 https://hal.science/hal-04113499 BIBCODE: 2009AGUFMGC24A.04D American Geophysical Union https://hal.science/hal-04113499 American Geophysical Union, 0000, à renseigner, Unknown Region 1630 GLOBAL CHANGE / Impacts of global change 4806 OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL / Carbon cycling 4916 PALEOCEANOGRAPHY / Corals 9355 GEOGRAPHIC LOCATION / Pacific Ocean [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2023 ftccsdartic 2023-11-18T23:47:58Z International audience Within the framework of EPOCA (European Project on OCean Acidification ) and the French INSU project PHARE, we are adapting the boron isotope technique to ancient corals with the scope to reconstruct “past” ocean pH changes. In this study, we applied the technique to surface seawater pH reconstructions based on tropical 20th century corals from Fiji. Models estimated a pH drop close to 0.07 pH units in the South Western Equatorial Pacific since the onset of the industrial era (Sabine et al., 2004). To reconstruct such a change in pH, the isotopic composition of boron (δ11B) in coral material has to be determined with a precision better than ±0.2‰. This analytical criteria was meet on a Multi-Collector ICPMS Neptune. We selected a Porites coral for the reconstruction of the time dependent evolution of pH. Our results show a progressive decrease of seawater pH between 1900 and 2000 of 0.08 +/- 0.02 pH units. This decrease in pH agrees with projections of surface ocean pH for the Fiji area obtained with the biogeochemical ocean circulation model NEMO-PISCES. Our results further reveal that seawater pH changes in the Fiji area are strongly affected by regional processes such as the South Pacific Convergence Zone (SPCZ) tightly linked the Pacific Decadal Oscillation (PDO). This last observation highlights the potential of the δ11B-pH technique for studying past changes of ocean dynamics. Hönisch, B., Hemming, N. G., Grottoli, A. G., Amat, A., Hanson, G. N. & Bijma, J. (2004). Assessing scleractinian corals as recoders for paleo-pH: Empirical calibration and vital effects. Geochimica et Cosmochimica Acta, 68(18), 3675-3685. Sabine, C. L., Feely, R. A., Gruber, N., Key, R. M., Lee, K., Bullister, J. L., Wanninkhof, R., Wong, C. S., Wallace, D. W. R., Tilbrook, B., Millero, F. J., Peng, T. H., Kozyr, A., Ono, T. & Rios, A. F. (2004). The Oceanic Sink for Anthropogenic CO2. Science, 305, 367-371. Conference Object Ocean acidification Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Pacific Phare ENVELOPE(141.464,141.464,-66.796,-66.796) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
1630 GLOBAL CHANGE / Impacts of global change 4806 OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL / Carbon cycling 4916 PALEOCEANOGRAPHY / Corals 9355 GEOGRAPHIC LOCATION / Pacific Ocean [SDU]Sciences of the Universe [physics] |
spellingShingle |
1630 GLOBAL CHANGE / Impacts of global change 4806 OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL / Carbon cycling 4916 PALEOCEANOGRAPHY / Corals 9355 GEOGRAPHIC LOCATION / Pacific Ocean [SDU]Sciences of the Universe [physics] Douville, E. Juillet-Leclerc, A. Cabioch, G. Louvat, P. Gaillardet, J. Gehlen, M. Bopp, L. Paterne, M. Boron isotopes in Fiji corals and precise ocean acidification reconstruction |
topic_facet |
1630 GLOBAL CHANGE / Impacts of global change 4806 OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL / Carbon cycling 4916 PALEOCEANOGRAPHY / Corals 9355 GEOGRAPHIC LOCATION / Pacific Ocean [SDU]Sciences of the Universe [physics] |
description |
International audience Within the framework of EPOCA (European Project on OCean Acidification ) and the French INSU project PHARE, we are adapting the boron isotope technique to ancient corals with the scope to reconstruct “past” ocean pH changes. In this study, we applied the technique to surface seawater pH reconstructions based on tropical 20th century corals from Fiji. Models estimated a pH drop close to 0.07 pH units in the South Western Equatorial Pacific since the onset of the industrial era (Sabine et al., 2004). To reconstruct such a change in pH, the isotopic composition of boron (δ11B) in coral material has to be determined with a precision better than ±0.2‰. This analytical criteria was meet on a Multi-Collector ICPMS Neptune. We selected a Porites coral for the reconstruction of the time dependent evolution of pH. Our results show a progressive decrease of seawater pH between 1900 and 2000 of 0.08 +/- 0.02 pH units. This decrease in pH agrees with projections of surface ocean pH for the Fiji area obtained with the biogeochemical ocean circulation model NEMO-PISCES. Our results further reveal that seawater pH changes in the Fiji area are strongly affected by regional processes such as the South Pacific Convergence Zone (SPCZ) tightly linked the Pacific Decadal Oscillation (PDO). This last observation highlights the potential of the δ11B-pH technique for studying past changes of ocean dynamics. Hönisch, B., Hemming, N. G., Grottoli, A. G., Amat, A., Hanson, G. N. & Bijma, J. (2004). Assessing scleractinian corals as recoders for paleo-pH: Empirical calibration and vital effects. Geochimica et Cosmochimica Acta, 68(18), 3675-3685. Sabine, C. L., Feely, R. A., Gruber, N., Key, R. M., Lee, K., Bullister, J. L., Wanninkhof, R., Wong, C. S., Wallace, D. W. R., Tilbrook, B., Millero, F. J., Peng, T. H., Kozyr, A., Ono, T. & Rios, A. F. (2004). The Oceanic Sink for Anthropogenic CO2. Science, 305, 367-371. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement (LSCE) Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Institut de Recherche pour le Développement (IRD) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Douville, E. Juillet-Leclerc, A. Cabioch, G. Louvat, P. Gaillardet, J. Gehlen, M. Bopp, L. Paterne, M. |
author_facet |
Douville, E. Juillet-Leclerc, A. Cabioch, G. Louvat, P. Gaillardet, J. Gehlen, M. Bopp, L. Paterne, M. |
author_sort |
Douville, E. |
title |
Boron isotopes in Fiji corals and precise ocean acidification reconstruction |
title_short |
Boron isotopes in Fiji corals and precise ocean acidification reconstruction |
title_full |
Boron isotopes in Fiji corals and precise ocean acidification reconstruction |
title_fullStr |
Boron isotopes in Fiji corals and precise ocean acidification reconstruction |
title_full_unstemmed |
Boron isotopes in Fiji corals and precise ocean acidification reconstruction |
title_sort |
boron isotopes in fiji corals and precise ocean acidification reconstruction |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04113499 |
op_coverage |
à renseigner, Unknown Region |
long_lat |
ENVELOPE(141.464,141.464,-66.796,-66.796) |
geographic |
Pacific Phare |
geographic_facet |
Pacific Phare |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
American Geophysical Union https://hal.science/hal-04113499 American Geophysical Union, 0000, à renseigner, Unknown Region |
op_relation |
hal-04113499 https://hal.science/hal-04113499 BIBCODE: 2009AGUFMGC24A.04D |
_version_ |
1785572014363246592 |