Articles | Volume 22, issue 9
https://doi.org/10.5194/cp-22-1609-2026
© Author(s) 2026. 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-22-1609-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
02 Sep 2026
Research article |
| 02 Sep 2026
| 02 Sep 2026
Mixed layer depth in the PMIP4 midHolocene simulations: comparison to proxy data in North Atlantic deep convection regions
Geotop and Centre ESCER, Université du Québec à Montréal (UQAM), Montréal, Québec H3C 3P8, Canada
Anne de Vernal
Geotop and Centre ESCER, Université du Québec à Montréal (UQAM), Montréal, Québec H3C 3P8, Canada
Paul G. Myers
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada
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EGUsphere, https://doi.org/10.5194/egusphere-2026-2314, https://doi.org/10.5194/egusphere-2026-2314, 2026
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As the Arctic warms, permafrost coasts erode rapidly, flushing carbon from frozen ground into the sea. We studied a lagoon in the western Canadian Arctic, collecting sediments and analyzing organic carbon content, stable isotopes, and grain size, alongside satellite imagery. Carbon content fell by over 50 % from land to open ocean, while erosion rates quintupled since the 1950s. Arctic lagoons bury, degrade, and export terrestrial carbon, acting as coastal reactors whose role will grow.
Tyler Pelle, Paul G. Myers, Andrew Hamilton, Matthew Mazloff, Krista M. Soderlund, Lucas Beem, Donald D. Blankenship, Cyril Grima, Feras Habbal, Mark Skidmore, and Jamin S. Greenbaum
Ocean Sci., 22, 187–208, https://doi.org/10.5194/os-22-187-2026, https://doi.org/10.5194/os-22-187-2026, 2026
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Here, we develop and run a high-resolution ocean model of Jones Sound from 2003–2016 and characterize circulation into, out of, and within the sound as well as associated sea ice and productivity cycles. Atmospheric and ocean warming drives sea ice decline, which enhances biological productivity due to the increased light availability. These results highlight the utility of high-resolution models in simulating complex waterways and the need for sustained oceanographic measurements in the sound.
Lukas Jonkers, Tonke Strack, Montserrat Alonso-Garcia, Simon D'haenens, Robert Huber, Michal Kucera, Iván Hernández-Almeida, Chloe L. C. Jones, Brett Metcalfe, Rajeev Saraswat, Lóránd Silye, Sanjay K. Verma, Muhamad Naim Abd Malek, Gerald Auer, Cátia F. Barbosa, Maria A. Barcena, Karl-Heinz Baumann, Flavia Boscolo-Galazzo, Joeven Austine S. Calvelo, Lucilla Capotondi, Martina Caratelli, Jorge Cardich, Humberto Carvajal-Chitty, Markéta Chroustová, Helen K. Coxall, Renata M. de Mello, Anne de Vernal, Paula Diz, Kirsty M. Edgar, Helena L. Filipsson, Ángela Fraguas, Heather L. Furlong, Giacomo Galli, Natalia L. García Chapori, Robyn Granger, Jeroen Groeneveld, Adil Imam, Rebecca Jackson, David Lazarus, Julie Meilland, Marína Molčan Matejová, Raphael Morard, Caterina Morigi, Sven N. Nielsen, Diana Ochoa, Maria Rose Petrizzo, Andrés S. Rigual-Hernández, Marina C. Rillo, Matthew L. Staitis, Gamze Tanık, Raúl Tapia, Nishant Vats, Bridget S. Wade, and Anna E. Weinmann
J. Micropalaeontol., 44, 145–168, https://doi.org/10.5194/jm-44-145-2025, https://doi.org/10.5194/jm-44-145-2025, 2025
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Our study provides guidelines improving the reuse of marine microfossil assemblage data, which are valuable for understanding past ecosystems and environmental change. Based on a survey of 113 researchers, we identified key data attributes required for effective reuse. Analysis of a selection of datasets available online reveals a gap between the attributes scientists consider essential and the data currently available, highlighting the need for clearer data documentation and sharing practices.
Jan-Hendrik Malles, Ben Marzeion, and Paul G. Myers
Earth Syst. Dynam., 16, 347–377, https://doi.org/10.5194/esd-16-347-2025, https://doi.org/10.5194/esd-16-347-2025, 2025
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Glaciers in the high-latitude Northern Hemisphere (outside Greenland) are losing mass at roughly half the Greenland ice sheet's rate. Still, this is usually not included in the freshwater input data for ocean circulation models. Also, the submarine melt of glaciers (outside the ice sheets) has not been quantified yet. We tackle both issues by using a glacier model's output as additional fresh water for the ocean model and by using the ocean model's output to model submarine melt.
Graham Epstein, Susanna D. Fuller, Dipti Hingmire, Paul G. Myers, Angelica Peña, Clark Pennelly, and Julia K. Baum
Earth Syst. Sci. Data, 16, 2165–2195, https://doi.org/10.5194/essd-16-2165-2024, https://doi.org/10.5194/essd-16-2165-2024, 2024
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Improved mapping of surficial seabed sediment organic carbon is vital for best-practice marine management. Here, using systematic data review, data unification process and machine learning techniques, the first national predictive maps were produced for Canada at 200 m resolution. We show fine-scale spatial variation of organic carbon across the continental margin and estimate the total standing stock in the top 30 cm of the sediment to be 10.9 Gt.
Sabrina Hohmann, Michal Kucera, and Anne de Vernal
Clim. Past, 19, 2027–2051, https://doi.org/10.5194/cp-19-2027-2023, https://doi.org/10.5194/cp-19-2027-2023, 2023
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Drivers for dinocyst assemblage compositions differ regionally and through time. Shifts in the assemblages can sometimes only be interpreted robustly by locally and sometimes globally calibrated transfer functions, questioning the reliability of environmental reconstructions. We suggest the necessity of a thorough evaluation of transfer function performance and significance for downcore applications to disclose the drivers for present and fossil dinocyst assemblages in a studied core location.
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Short summary
The ocean mixed layer needs to be correctly represented in climate models to provide reliable future projections. We evaluate the mixed layer depth in 15 climate models against reconstructions for the mid-Holocene North Atlantic. The lack of meltwater input to models causes the simulated mixed layer to be deeper than reconstructed in the Labrador Sea but does not affect the Nordic Seas. Deep ocean mixing in the Labrador Sea may be particularly sensitive to ice-sheet melting under global warming.
The ocean mixed layer needs to be correctly represented in climate models to provide reliable...
