Articles | Volume 22, issue 12
https://doi.org/10.5194/bg-22-2831-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-2831-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 Jun 2025
Research article |
| 19 Jun 2025
| 19 Jun 2025
Magnesium (Mg∕Ca, δ26Mg), boron (B∕Ca, δ11B), and calcium (Ca2+) geochemistry of Arctica islandica and Crassostrea virginica extrapallial fluid and shell under ocean acidification
Blanca Alvarez Caraveo
CORRESPONDING AUTHOR
Atmospheric and Oceanic Sciences Department, University of California, Los Angeles, Math Sciences Building, 520 Portola Plaza, Los Angeles, CA 90095, USA
Center for Diverse Leadership in Science, Institute of the Environment and Sustainability, University of California, Los Angeles, La Kretz Hall, 619 Charles E. Young Dr. E. no. 300, Los Angeles, CA 90024, USA
Maxence Guillermic
Atmospheric and Oceanic Sciences Department, University of California, Los Angeles, Math Sciences Building, 520 Portola Plaza, Los Angeles, CA 90095, USA
Center for Diverse Leadership in Science, Institute of the Environment and Sustainability, University of California, Los Angeles, La Kretz Hall, 619 Charles E. Young Dr. E. no. 300, Los Angeles, CA 90024, USA
Earth, Planetary and Space Sciences, Department, University of California, Los Angeles, Los Angeles, CA 90095, USA
Alan Downey-Wall
Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Rd., Nahant, MA 01908, USA
Louise P. Cameron
Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Rd., Nahant, MA 01908, USA
Jill N. Sutton
LEMAR, Université de Brest, UMR 6539 CNRS/UBO/IRD/Ifremer, LEMAR, IUEM, 29280, Plouzané, France
John A. Higgins
Department of Geosciences, Princeton University, Guyot Hall, Princeton, NJ 08544, USA
Justin B. Ries
Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Rd., Nahant, MA 01908, USA
Katie Lotterhos
Department of Marine and Environmental Sciences, Marine Science Center, Northeastern University, 430 Nahant Rd., Nahant, MA 01908, USA
Atmospheric and Oceanic Sciences Department, University of California, Los Angeles, Math Sciences Building, 520 Portola Plaza, Los Angeles, CA 90095, USA
Center for Diverse Leadership in Science, Institute of the Environment and Sustainability, University of California, Los Angeles, La Kretz Hall, 619 Charles E. Young Dr. E. no. 300, Los Angeles, CA 90024, USA
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Maxence Guillermic, Erik C. Krieger, Joyce Goh, Christopher E. Cornwall, and Robert A. Eagle
EGUsphere, https://doi.org/10.5194/egusphere-2025-2626, https://doi.org/10.5194/egusphere-2025-2626, 2025
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We address the impact of light on four complexes of coralline red algae using boron and carbon isotopic signatures. We show that the four complexes up-regulated their δ11B derived pHCF relative to seawater by 0.6 to 0.8 pH unit but pHCF was not directly impacted by light at the complex level. The differences in calcification between encrusting and branching complexes result from different photosynthetic regimes and carbon concentrating mechanisms, which would be inherent to morphologies.
Maxence Guillermic, Sambuddha Misra, Robert Eagle, and Aradhna Tripati
Clim. Past, 18, 183–207, https://doi.org/10.5194/cp-18-183-2022, https://doi.org/10.5194/cp-18-183-2022, 2022
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Here we reconstruct atmospheric CO2 values across major climate transitions over the past 16 million years (Myr) from two sites in the West Pacific Warm Pool using a pH proxy on surface-dwelling foraminifera. We are able to reproduce pCO2 data from ice cores; therefore we apply the same framework to older samples to create a long-term pH and pCO2 reconstruction. We give quantitative constraints on pH and pCO2 changes over the main climate transitions of the last 16 Myr.
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Clim. Past, 17, 1841–1855, https://doi.org/10.5194/cp-17-1841-2021, https://doi.org/10.5194/cp-17-1841-2021, 2021
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Here we reconstruct the rate of snow accumulation during the Last Interglacial period in an East Antarctic ice core located near the present-day northern edge of the Ross Ice Shelf. We find an order-of-magnitude increase in the accumulation rate during the peak warming in the Last Interglacial. This large increase in mass accumulation is compatible with less ice cover in the Ross Sea, perhaps created by a partly collapsed West Antarctic Ice Sheet, whose stability in a warming world is uncertain.
Paul J. Tréguer, Jill N. Sutton, Mark Brzezinski, Matthew A. Charette, Timothy Devries, Stephanie Dutkiewicz, Claudia Ehlert, Jon Hawkings, Aude Leynaert, Su Mei Liu, Natalia Llopis Monferrer, María López-Acosta, Manuel Maldonado, Shaily Rahman, Lihua Ran, and Olivier Rouxel
Biogeosciences, 18, 1269–1289, https://doi.org/10.5194/bg-18-1269-2021, https://doi.org/10.5194/bg-18-1269-2021, 2021
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Silicon is the second most abundant element of the Earth's crust. In this review, we show that silicon inputs and outputs, to and from the world ocean, are 57 % and 37 % higher, respectively, than previous estimates. These changes are significant, modifying factors such as the geochemical residence time of silicon, which is now about 8000 years and 2 times faster than previously assumed. We also update the total biogenic silica pelagic production and provide an estimate for sponge production.
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Short summary
We studied the geochemistry of two bivalves: Crassostrea virginica and Arctica islandica. We examined the effects of three ocean acidification conditions (ambient, moderate, and high) on the geochemistry of C. virginica. We show that bivalves have high physiological control over the internal calcifying fluid, presenting a challenge in using elemental proxies for reconstructing seawater parameters.
We studied the geochemistry of two bivalves: Crassostrea virginica and Arctica islandica. We...
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