Articles | Volume 18, issue 5
https://doi.org/10.5194/cp-18-989-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-18-989-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
06 May 2022
Research article |
| 06 May 2022
| 06 May 2022
Reorganization of Atlantic Waters at sub-polar latitudes linked to deep-water overflow in both glacial and interglacial climate states
Dakota E. Holmes
Department of Geography, School of Geography, Archaeology, and Irish Studies, National University of Ireland Galway, Galway, Ireland
Ryan Institute for Environmental, Marine, and Energy Research, Galway, Ireland
Tali L. Babila
Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, UK
Ulysses Ninnemann
Department of Earth Science and Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway
Gordon Bromley
Department of Geography, School of Geography, Archaeology, and Irish Studies, National University of Ireland Galway, Galway, Ireland
Ryan Institute for Environmental, Marine, and Energy Research, Galway, Ireland
Shane Tyrrell
Earth and Ocean Sciences, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
iCRAG Irish Centre for Research in Applied Geosciences, Dublin, Ireland
Greig A. Paterson
Department of Earth, Ocean, and Ecological Sciences, University of Liverpool, Liverpool, UK
Michelle J. Curran
Department of Geography, School of Geography, Archaeology, and Irish Studies, National University of Ireland Galway, Galway, Ireland
Ryan Institute for Environmental, Marine, and Energy Research, Galway, Ireland
Department of Geography, School of Geography, Archaeology, and Irish Studies, National University of Ireland Galway, Galway, Ireland
Ryan Institute for Environmental, Marine, and Energy Research, Galway, Ireland
iCRAG Irish Centre for Research in Applied Geosciences, Dublin, Ireland
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Elwyn de la Vega, Markus Raitzsch, Gavin Foster, Jelle Bijma, Ulysses Silas Ninnemann, Michal Kucera, Tali Lea Babila, Jessica Crumpton Banks, Mohamed M. Ezat, and Audrey Morley
EGUsphere, https://doi.org/10.5194/egusphere-2025-2443, https://doi.org/10.5194/egusphere-2025-2443, 2025
Short summary
Short summary
The boron isotopic composition (δ11B) of foraminifera shells is an established proxy for the reconstruction of ocean pH. Applications to the Arctic oceans are however limited as robust calibrations in these regions are lacking. Here, we present a new calibration linking δ11B measured in two high-latitude foraminifera species to seawater pH. We show that the δ11B of the species analysed is well correlated with seawater pH and that this calibration can be applied to the paleorecord.
Gordon R. M. Bromley, Greg Balco, Margaret S. Jackson, Allie Balter-Kennedy, and Holly Thomas
Clim. Past, 21, 145–160, https://doi.org/10.5194/cp-21-145-2025, https://doi.org/10.5194/cp-21-145-2025, 2025
Short summary
Short summary
We constructed a geologic record of East Antarctic Ice Sheet thickness from deposits at Otway Massif to directly assess how Earth's largest ice sheet responds to warmer-than-present climate. Our record confirms the long-term dominance of a cold polar climate but lacks a clear ice sheet response to the mid-Pliocene Warm Period, a common analogue for the future. Instead, an absence of moraines from the late Miocene–early Pliocene suggests the ice sheet was less extensive than present at that time.
Michelle J. Curran, Christophe Colin, Megan Murphy O’Connor, Ulysses S. Ninnemann, and Audrey Morley
Clim. Past Discuss., https://doi.org/10.5194/cp-2023-101, https://doi.org/10.5194/cp-2023-101, 2024
Revised manuscript not accepted
Short summary
Short summary
Our multi-proxy examination of an abrupt climate event during peak MIS11 reveals new evidence that the reorganisation of Polar and Atlantic Waters at subpolar latitudes is central mechanistically for the stability of North Atlantic Deep Water formation. We conclude that high-magnitude AMOC variability is possible without the addition of freshwater or Icebergs to deep water formation regions challenging established knowledge of AMOC sensitivity and stability during warm climates.
Annique van der Boon, Andrew J. Biggin, Greig A. Paterson, and Janine L. Kavanagh
Geosci. Commun., 5, 55–66, https://doi.org/10.5194/gc-5-55-2022, https://doi.org/10.5194/gc-5-55-2022, 2022
Short summary
Short summary
We present the Magnetic to the Core project, which communicated palaeomagnetism to members of the general public through hands-on experiments. The impact of the project was tested with an interactive quiz, which shows that this outreach event was successful in impacting visitors’ learning. We hope our Magnetic to the Core project can serve as an inspiration for other Earth science laboratories looking to engage a wide audience and measure the success and impact of their outreach activities.
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Short summary
Our proxy-based observations of the glacial inception following MIS 11 advance our mechanistic understanding of (and elucidates antecedent conditions that can lead to) high-magnitude climate instability during low- and intermediate-ice boundary conditions. We find that irrespective of the magnitude of climate variability or boundary conditions, the reorganization between Polar Water and Atlantic Water at subpolar latitudes appears to influence deep-water flow in the Nordic Seas.
Our proxy-based observations of the glacial inception following MIS 11 advance our mechanistic...
