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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EGUsphere, https://doi.org/10.5194/egusphere-2026-5607, https://doi.org/10.5194/egusphere-2026-5607, 2026
This preprint is open for discussion and under review for The Cryosphere (TC).
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Ice cores from the Allan Hills, Antarctica preserve important information about the last six million years of Earth’s climate history. However, interpreting these cores is complex given the unique history of this ice. Here, we employ a new method that enables high-resolution sampling even across tilted layers to characterize 1.3–1.8-million-year-old ice samples. Our findings provide new constraints on abrupt age transitions and the incorporation of material from beneath the glacier in this ice.
Julia Marks-Peterson, Edward J. Brook, Jenna A. Epifanio, Emily Rice, Jeff Severinghaus, Murat Aydin, Samantha Gass, Jon S. Edwards, Austin Carter, Christo Buizert, John A. Higgins, Sarah A. Shackleton, Jacob D. Morgan, Michael Kalk, Ross Beaudette, Andrei Kurbatov, and Eric Saltzman
EGUsphere, https://doi.org/10.5194/egusphere-2026-5793, https://doi.org/10.5194/egusphere-2026-5793, 2026
This preprint is open for discussion and under review for Climate of the Past (CP).
Short summary
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A new ice core from the Allan Hills Blue Ice Area, Antarctica provides a continuous record from ~149 to 116 thousand years ago, spanning a glacial-interglacial transition. We create a gas-age scale for the core and present new records of greenhouse gases that show very good agreement with other Antarctic cores. Additionally, site-specific measurements suggest the core has a similar source region to discontinuous old ice nearby, making it a valuable analogue for interpreting complex archives.
Alissa Choi, Austin J. Carter, Julia Marks-Peterson, Sarah Shackleton, John A. Higgins, Edward J. Brook, Liam Kirkpatrick, Jacob I. Chalif, and Sarah M. Aarons
EGUsphere, https://doi.org/10.5194/egusphere-2026-2434, https://doi.org/10.5194/egusphere-2026-2434, 2026
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We investigated the particle mass concentration, size distribution, and mineralogy of an ice core drilled from the Allan Hills, Antarctica to assess the preservation of dust records in Blue Ice Areas (BIAs) with complex flow histories. We find potential evidence of alteration including entrainment of basal sediment in the deepest ice, biasing towards interglacial dust concentrations, and chemical weathering. Thus, accurate reconstruction of climate signals in BIAs requires a multiproxy approach.
Abigail Hudak, Asmita Banerjee, Christo Buizert, Edward Brook, Michael Kalk, Lindsey Davidge, Andrew J. Schauer, Eric J. Steig, Noah Brown, Liam Kirkpatrick, John-Morgan Manos, Jacob I. Chalif, Erich Osterberg, Miranda Helena Miranda, Eric Saltzman, Yuzhen Yan, Valens Hishamunda, and John Higgins
EGUsphere, https://doi.org/10.5194/egusphere-2026-2045, https://doi.org/10.5194/egusphere-2026-2045, 2026
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The Allan Hills contains the oldest known ice, extending records millions of years, however, this area along the Transantarctic Mountains margin results in stratigraphically discontinuous ice core records. Here, we investigate high-resolution geochemical records to better constrain biases and stratigraphic complexities, and find these records exhibit reduced variance, some degree of interglacial bias, with varying behaviours across ice cores at the Allan Hills.
Hayley Lauren Bricker, Yurena Yanes, Alexa Terrazas, Alexandrea Jay Arnold, Jesse Bloom Bateman, Paul Valdes, Alexander Farnsworth, Robert Eagle, and Aradhna K. Tripati
EGUsphere, https://doi.org/10.5194/egusphere-2025-6270, https://doi.org/10.5194/egusphere-2025-6270, 2026
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At the Last Glacial Maximum (LGM) ~21,000 years ago, global temperatures were 3–6 °C cooler than today. In Northwest Africa, a region influenced by complex seasonal oceanic and atmospheric processes, the nearby Canary Islands offer valuable insight. We analyzed modern and LGM land snails using carbonate clumped isotope thermometry and δ18O isotope analysis to assess temperature and precipitation. We find ~8 degrees of cooling during the LGM and no major changes in water source since then.
Maxence Guillermic, Erik C. Krieger, Joyce Goh, Christopher E. Cornwall, and Robert A. Eagle
Biogeosciences, 22, 7669–7686, https://doi.org/10.5194/bg-22-7669-2025, https://doi.org/10.5194/bg-22-7669-2025, 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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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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