Articles | Volume 22, issue 3
https://doi.org/10.5194/os-22-1819-2026
© 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/os-22-1819-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Jun 2026
Research article |
| 12 Jun 2026
| 12 Jun 2026
Greenland tip jet and deep convection in the Irminger Sea: disentangling the roles of heat loss and wind stress
Aleksandr M. Fedorov
CORRESPONDING AUTHOR
Royal Netherlands Institute for Sea Research (NIOZ), Department of Ocean Systems, Texel, the Netherlands
Institute for Marine and Atmospheric research Utrecht (IMAU), Department of Physics, Utrecht University, Utrecht, the Netherlands
M. Femke De Jong
Royal Netherlands Institute for Sea Research (NIOZ), Department of Ocean Systems, Texel, the Netherlands
Claudia E. Wieners
Institute for Marine and Atmospheric research Utrecht (IMAU), Department of Physics, Utrecht University, Utrecht, the Netherlands
Elodie Duyck
Royal Netherlands Institute for Sea Research (NIOZ), Department of Ocean Systems, Texel, the Netherlands
Henk A. Dijkstra
Institute for Marine and Atmospheric research Utrecht (IMAU), Department of Physics, Utrecht University, Utrecht, the Netherlands
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Shruti Setty, Henk A. Dijkstra, Lucas J. Lourens, Egbert H. van Nes, Marlow J. Cramwinckel, Ingrid A. van de Leemput, and Appy Sluijs
EGUsphere, https://doi.org/10.5194/egusphere-2026-5433, https://doi.org/10.5194/egusphere-2026-5433, 2026
This preprint is open for discussion and under review for Earth System Dynamics (ESD).
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We studied the dynamic causal relationship in the climate-carbon cycle system in the past 66 million years using machine learning approaches in continuous high-resolution deep ocean climate and carbon cycle proxies. Our study suggests strong causality during warm climate states and insignificant causality in others. Our study also points towards an orbital influence and strengthening positive feedbacks towards both abrupt warming and cooling events hypothesized to be due to tipping points.
Alejandro Hermoso, Lucas Ferreira Correa, Casey R. Patrizio, Henk Dijkstra, Anna von der Heydt, and Christoph C. Raible
EGUsphere, https://doi.org/10.5194/egusphere-2026-5619, https://doi.org/10.5194/egusphere-2026-5619, 2026
This preprint is open for discussion and under review for Earth System Dynamics (ESD).
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The North Atlantic jet stream strongly influences European weather variability. We investigate how it may change under global warming and a collapse of the Atlantic Meridional Overturning Circulation. Using two climate models and higher-resolution regional simulations, we find that the jet stream response is strongly model dependent. The regional simulations retain the large-scale response of the global models, while also introducing regional differences in the jet stream response.
Meike de Nooij, Jasper de Jong, Michiel L. J. Baatsen, and Claudia Elisabeth Wieners
EGUsphere, https://doi.org/10.5194/egusphere-2026-4133, https://doi.org/10.5194/egusphere-2026-4133, 2026
This preprint is open for discussion and under review for Earth System Dynamics (ESD).
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Winter storms outside the tropics dominate extreme wind and precipitation events in the so-called storm track regions. Under global warming, storm tracks can shift location. In general, wind extremes in storm tracks become less frequent under global warming, but precipitation extremes more frequent. Stratospheric Aerosol Injection (SA), a possible tool to artificially reduce global warming, reverts the overall trend on extremes, but not perfectly: regional shifts remain.
Reyk Börner and Henk A. Dijkstra
EGUsphere, https://doi.org/10.5194/egusphere-2026-3507, https://doi.org/10.5194/egusphere-2026-3507, 2026
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Tipping points have become a popular concept in earth sciences and for communicating climate change risk. However, there is confusion about what tipping means, caused also by ambiguous definitions of tipping terminology. We propose and exemplify a revised tipping definition, focusing on the observed time series and underlying cause of a tipping event. Our proposition seeks to bridge between narrow mathematical and purely qualitative definitions that often remain unclear and difficult to test.
Emma J. V. Smolders, René M. van Westen, and Henk A. Dijkstra
Ocean Sci., 22, 1965–1985, https://doi.org/10.5194/os-22-1965-2026, https://doi.org/10.5194/os-22-1965-2026, 2026
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The Southern Ocean shows strong natural variability on multi-decadal time scales, known as the Southern Ocean Mode (SOM). Using high-resolution ocean simulations, we show that a collapse of the Atlantic Meridional Overturning Circulation (AMOC) strongly weakens the SOM. This weakening is linked to changes in ocean density, a slowdown of the Antarctic Circumpolar Current, and shifts in deep convection across the Southern Ocean.
Toon Bense, Henk A. Dijkstra, and Pepijn Bakker
EGUsphere, https://doi.org/10.5194/egusphere-2026-2794, https://doi.org/10.5194/egusphere-2026-2794, 2026
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We propose a framework that connects models and geological data to increase our understanding of the natural variability of the climate on (multi-)centennial timescales. We use a climate model simulation as testing bed to show Multi-channel Singular Spectrum Analysis can be a suitable method in this context, even when applied to data constrained by relatively sparse locations where geological data is available. This motivates development and application of the method to geological archives.
Nora Fried, Renske Gelderloos, Oliver J. Tooth, Caroline A. Katsman, and M. Femke de Jong
Ocean Sci., 22, 1763–1780, https://doi.org/10.5194/os-22-1763-2026, https://doi.org/10.5194/os-22-1763-2026, 2026
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This study investigates how much warm and saline subtropical-origin water flowing in the Irminger Current (IC) can enter the Irminger Sea convection region by releasing virtual particles in an ocean model. We show that one quarter of IC waters enter the convection region with the potential to increase local stratification. Our results suggest that changes in the water mass properties of the IC have the potential to influence the strength of deep convection in the Irminger Sea.
Oliver Mehling, Elian Vanderborght, and Henk A. Dijkstra
Earth Syst. Dynam., 17, 563–579, https://doi.org/10.5194/esd-17-563-2026, https://doi.org/10.5194/esd-17-563-2026, 2026
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This study revisits how critical thresholds for tipping of the Atlantic Meridional Overturning Circulation (AMOC) are derived from comprehensive climate models. It is shown that the method for keeping the global salinity constant – by compensating salinity either at the surface or throughout the ocean volume – matters for AMOC tipping: with surface compensation, the tipping point shifts to larger freshwater forcing values, mainly due to (artificial) salt input in the North Atlantic and Arctic.
Francesco Guardamagna, Sacha Sinet, and Henk A. Dijkstra
EGUsphere, https://doi.org/10.5194/egusphere-2026-1872, https://doi.org/10.5194/egusphere-2026-1872, 2026
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The Atlantic Meridional Overturning Circulation (AMOC) is an ocean current that redistributes heat in the Atlantic Ocean and may abruptly weaken under climate change, with impacts including cooling in Europe and sea-level rise along the North American East Coast. Freshwater input from melting ice into the North Atlantic can push the system toward a tipping point. We introduce an artificial intelligence-based method to estimate the distance to this tipping point in terms of freshwater forcing.
Jelle Soons, Elian Vanderborght, and Henk A. Dijkstra
EGUsphere, https://doi.org/10.5194/egusphere-2025-6565, https://doi.org/10.5194/egusphere-2025-6565, 2026
This preprint is open for discussion and under review for Earth System Dynamics (ESD).
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The Atlantic Meridional Overturning Circulation (AMOC) is a major ocean circulation that regulates the global climate and could potentially collapse under climate change. Previously it has been shown that constructing a closure of the Bering Strait could prevent this collapse. In this study we use a box model to represent the global ocean circulation, and show that closing this Strait can either weaken or protect the AMOC, depending on background conditions and the rate of temperature increase.
René M. van Westen, Elian Vanderborght, and Henk A. Dijkstra
Earth Syst. Dynam., 16, 2063–2085, https://doi.org/10.5194/esd-16-2063-2025, https://doi.org/10.5194/esd-16-2063-2025, 2025
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The Atlantic Meridional Overturning Circulation (AMOC) is a tipping element in the fully-coupled Community Earth System Model (CESM). Under varying freshwater flux forcing parameters or climate change, the AMOC may collapse from a relatively strong state to a substantially weaker state. It is important to understand the dynamics of the AMOC collapse in the CESM. We show that the stability of the AMOC in the CESM is controlled by only a few feedback processes.
Jasper de Jong, Daniel Pflüger, Simone Lingbeek, Claudia E. Wieners, Michiel L. J. Baatsen, and René R. Wijngaard
Geosci. Model Dev., 18, 8679–8702, https://doi.org/10.5194/gmd-18-8679-2025, https://doi.org/10.5194/gmd-18-8679-2025, 2025
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Injection of reflective sulfate aerosols high in the atmosphere is a proposed method to mitigate global warming. Climate simulations with injection are more expensive than standard future projections. We propose a method that dynamically scales the forcing fields based on pre-existing full-complexity data. This opens up possibilities for ensemble generation, new scenarios and higher resolution runs. We show that our method works for multiple model versions, injection scenarios and resolutions.
Swinda K. J. Falkena, Henk A. Dijkstra, and Anna S. von der Heydt
Earth Syst. Dynam., 16, 1833–1844, https://doi.org/10.5194/esd-16-1833-2025, https://doi.org/10.5194/esd-16-1833-2025, 2025
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The subpolar gyre is a wind-driven circulation in the North Atlantic Ocean that enables the mixing of water between the surface and deeper layers. We investigate the interactions between the strength of the gyre circulation, salinity, temperature, and mixing in climate models. We find that most models capture an increase in salinity or a decrease in temperature, leading to mixing. However, the feedback from the density in the gyre centre to the strength of its circulation is poorly represented.
Sina Loriani, Yevgeny Aksenov, David I. Armstrong McKay, Govindasamy Bala, Andreas Born, Cristiano Mazur Chiessi, Henk A. Dijkstra, Jonathan F. Donges, Sybren Drijfhout, Matthew H. England, Alexey V. Fedorov, Laura C. Jackson, Kai Kornhuber, Gabriele Messori, Francesco S. R. Pausata, Stefanie Rynders, Jean-Baptiste Sallée, Bablu Sinha, Steven C. Sherwood, Didier Swingedouw, and Thejna Tharammal
Earth Syst. Dynam., 16, 1611–1653, https://doi.org/10.5194/esd-16-1611-2025, https://doi.org/10.5194/esd-16-1611-2025, 2025
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In this work, we draw on palaeo-records, observations, and modelling studies to review tipping points in the ocean overturning circulations, monsoon systems, and global atmospheric circulations. We find indications for tipping in the ocean overturning circulations and the West African monsoon, with potentially severe impacts on the Earth system and humans. Tipping in the other considered systems is regarded as conceivable but is currently not sufficiently supported by evidence.
Aurora Faure Ragani and Henk A. Dijkstra
Earth Syst. Dynam., 16, 1287–1301, https://doi.org/10.5194/esd-16-1287-2025, https://doi.org/10.5194/esd-16-1287-2025, 2025
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The Atlantic Meridional Overturning Circulation (AMOC) is sensitive to changing surface forcing conditions. Under future greenhouse gas emission reductions, it was shown in a conceptual model that it may be possible to avoid a collapse of the AMOC. Using a detailed global ocean model, we clarify the physics of the collapse and recovery behaviour of the AMOC. The potential to avoid an AMOC collapse is tightly linked to a delicate balance of salt fluxes in the northern North Atlantic.
Amber A. Boot and Henk A. Dijkstra
Earth Syst. Dynam., 16, 1221–1235, https://doi.org/10.5194/esd-16-1221-2025, https://doi.org/10.5194/esd-16-1221-2025, 2025
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The Atlantic Meridional Overturning Circulation (AMOC) is a tipping element in the Earth system that affects the global climate. We often use models to understand how the AMOC tips. However, these models are flawed. Here we study the effect of these flaws on the AMOC multistable regime in a climate model. We artificially add additional flaws to the model. We find that AMOC stability can be affected by such flaws, and a reduction in such flaws in climate models is therefore thought to be essential.
Gideon Futerman, Mira Adhikari, Alistair Duffey, Yuanchao Fan, Jessica Gurevitch, Peter Irvine, and Claudia Wieners
Earth Syst. Dynam., 16, 939–978, https://doi.org/10.5194/esd-16-939-2025, https://doi.org/10.5194/esd-16-939-2025, 2025
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This review assesses the interaction of solar radiation modification (SRM), a technology to reduce the impacts of climate change by reflecting sunlight and earth system tipping elements. We find that SRM at least partially reduces the risk of hitting most (9 out of 15) of the tipping points we studied relative to the same emission pathway and did not overall worsen the risk for any. Uncertainties for all tipping elements studied were high, so we also lay out suggestions for future research.
Francesco Guardamagna, Claudia Wieners, and Henk A. Dijkstra
Nonlin. Processes Geophys., 32, 201–224, https://doi.org/10.5194/npg-32-201-2025, https://doi.org/10.5194/npg-32-201-2025, 2025
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Artificial intelligence (AI) has recently shown promising results in ENSO (El Niño–Southern Oscillation) forecasting, outperforming traditional models. Yet AI models deliver accurate predictions without showing the underlying mechanisms. Our study examines a specific AI model, the reservoir computer (RC). Our results show that the RC is less sensitive to initial perturbations than the traditional Zebiak–Cane (ZC) model. This reduced sensitivity can explain the RC's superior skills.
Woosok Moon, Seung Pyo Lee, Elian Vanderborght, Georgy Manucharyan, and Henk Dijkstra
EGUsphere, https://doi.org/10.5194/egusphere-2025-1004, https://doi.org/10.5194/egusphere-2025-1004, 2025
Preprint archived
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As the climate warms, extreme weather is becoming more frequent in mid-latitudes. A key factor is the jet stream, shaped by atmospheric waves that influence wind and storm patterns. This study presents a simplified model showing how swirling air currents (eddies) maintain the jet stream and impact weather. As global warming alters these patterns, this research helps improve predictions of future weather changes.
Bouke Biemond, Wouter M. Kranenburg, Ymkje Huismans, Huib E. de Swart, and Henk A. Dijkstra
Ocean Sci., 21, 261–281, https://doi.org/10.5194/os-21-261-2025, https://doi.org/10.5194/os-21-261-2025, 2025
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We study salinity in estuaries consisting of a network of channels. To this end, we develop a model that computes the flow and salinity in such systems. We use the model to quantify the mechanisms by which salt is transported into estuarine networks, the response to changes in river discharge, and the impact of depth changes. Results show that when changing the depth of channels, the effects on salt intrusion into other channels in the network can be larger than the effect on the channel itself.
Elodie Duyck, Nicholas P. Foukal, and Eleanor Frajka-Williams
Ocean Sci., 21, 241–260, https://doi.org/10.5194/os-21-241-2025, https://doi.org/10.5194/os-21-241-2025, 2025
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This study uses drifters – instruments that follow surface ocean currents – to investigate the pathways of Arctic origin waters that enter the North Atlantic west of Greenland. It shows that these waters remain close to the coast as they flow over the Labrador shelf and only spread into the open ocean south of the Labrador Sea. These results contribute to better understanding how the North Atlantic will be affected by additional freshwater from Greenland and the Arctic in the coming decades.
Amber A. Boot and Henk A. Dijkstra
Earth Syst. Dynam., 16, 115–150, https://doi.org/10.5194/esd-16-115-2025, https://doi.org/10.5194/esd-16-115-2025, 2025
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The ocean is forced at the surface by a heat flux and a freshwater flux. This noise can influence long-term ocean variability and large-scale circulation. Here we study noise characteristics in reanalysis data for these fluxes. We try to capture the noise characteristics by using several noise models and compare these to state-of-the-art climate models. A pointwise noise model performs better than the climate models and can be used as forcing in ocean-only models.
Amber A. Boot, Anna S. von der Heydt, and Henk A. Dijkstra
Earth Syst. Dynam., 15, 1567–1590, https://doi.org/10.5194/esd-15-1567-2024, https://doi.org/10.5194/esd-15-1567-2024, 2024
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We investigate the multiple equilibria window (MEW) of the Atlantic Meridional Overturning Circulation (AMOC) within a box model. We find that increasing the total carbon content of the system widens the MEW of the AMOC. The important mechanisms at play are the balance between the source and sink of carbon and the sensitivity of the AMOC to freshwater forcing over the Atlantic Ocean. Our results suggest that changes in the marine carbon cycle can influence AMOC stability in future climates.
Claudia Elisabeth Wieners and Guðmundur Hálfdanarson
Nat. Hazards Earth Syst. Sci., 24, 2971–2994, https://doi.org/10.5194/nhess-24-2971-2024, https://doi.org/10.5194/nhess-24-2971-2024, 2024
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After the 1783 Laki eruption, excess mortality in Iceland was one-sixth of the population, traditionally explained by famine due to livestock loss. Since 1970, it has been suggested that 1) fluorine poisoning may have contributed to mortality in Iceland and 2) air pollution might have caused excess deaths in both Iceland and Europe. Reviewing contemporary Icelandic demographic data, air pollution simulations, and medical records on fluorosis, we show that evidence for both hypotheses is weak.
Arthur Merlijn Oldeman, Michiel L. J. Baatsen, Anna S. von der Heydt, Frank M. Selten, and Henk A. Dijkstra
Earth Syst. Dynam., 15, 1037–1054, https://doi.org/10.5194/esd-15-1037-2024, https://doi.org/10.5194/esd-15-1037-2024, 2024
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We might be able to constrain uncertainty in future climate projections by investigating variations in the climate of the past. In this study, we investigate the interactions of climate variability between the tropical Pacific (El Niño) and the North Pacific in a warm past climate – the mid-Pliocene, a period roughly 3 million years ago. Using model simulations, we find that, although the variability in El Niño was reduced, the variability in the North Pacific atmosphere was not.
Sacha Sinet, Peter Ashwin, Anna S. von der Heydt, and Henk A. Dijkstra
Earth Syst. Dynam., 15, 859–873, https://doi.org/10.5194/esd-15-859-2024, https://doi.org/10.5194/esd-15-859-2024, 2024
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Some components of the Earth system may irreversibly collapse under global warming. Among them, the Atlantic Meridional Overturning Circulation (AMOC), the Greenland Ice Sheet, and West Antarctica Ice Sheet are of utmost importance for maintaining the present-day climate. In a simplified model, we show that both the rate of ice melting and the natural variability linked to freshwater fluxes over the Atlantic Ocean drastically affect how an ice sheet collapse impacts the AMOC stability.
Julia E. Weiffenbach, Henk A. Dijkstra, Anna S. von der Heydt, Ayako Abe-Ouchi, Wing-Le Chan, Deepak Chandan, Ran Feng, Alan M. Haywood, Stephen J. Hunter, Xiangyu Li, Bette L. Otto-Bliesner, W. Richard Peltier, Christian Stepanek, Ning Tan, Julia C. Tindall, and Zhongshi Zhang
Clim. Past, 20, 1067–1086, https://doi.org/10.5194/cp-20-1067-2024, https://doi.org/10.5194/cp-20-1067-2024, 2024
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Elevated atmospheric CO2 concentrations and a smaller Antarctic Ice Sheet during the mid-Pliocene (~ 3 million years ago) cause the Southern Ocean surface to become fresher and warmer, which affects the global ocean circulation. The CO2 concentration and the smaller Antarctic Ice Sheet both have a similar and approximately equal impact on the Southern Ocean. The conditions of the Southern Ocean in the mid-Pliocene could therefore be analogous to those in a future climate with smaller ice sheets.
René M. van Westen and Henk A. Dijkstra
Ocean Sci., 20, 549–567, https://doi.org/10.5194/os-20-549-2024, https://doi.org/10.5194/os-20-549-2024, 2024
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The Atlantic Meridional Overturning Circulation (AMOC) is an important component in the global climate system. Observations of the present-day AMOC indicate that it may weaken or collapse under global warming, with profound disruptive effects on future climate. However, AMOC weakening is not correctly represented because an important feedback is underestimated due to biases in the Atlantic's freshwater budget. Here we address these biases in several state-of-the-art climate model simulations.
Arthur Merlijn Oldeman, Michiel L. J. Baatsen, Anna S. von der Heydt, Aarnout J. van Delden, and Henk A. Dijkstra
Weather Clim. Dynam., 5, 395–417, https://doi.org/10.5194/wcd-5-395-2024, https://doi.org/10.5194/wcd-5-395-2024, 2024
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The mid-Pliocene, a geological period around 3 million years ago, is sometimes considered the best analogue for near-future climate. It saw similar CO2 concentrations to the present-day but also a slightly different geography. In this study, we use climate model simulations and find that the Northern Hemisphere winter responds very differently to increased CO2 or to the mid-Pliocene geography. Our results weaken the potential of the mid-Pliocene as a future climate analogue.
Michiel Baatsen, Peter Bijl, Anna von der Heydt, Appy Sluijs, and Henk Dijkstra
Clim. Past, 20, 77–90, https://doi.org/10.5194/cp-20-77-2024, https://doi.org/10.5194/cp-20-77-2024, 2024
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This work introduces the possibility and consequences of monsoons on Antarctica in the warm Eocene climate. We suggest that such a monsoonal climate can be important to understand conditions in Antarctica prior to large-scale glaciation. We can explain seemingly contradictory indications of ice and vegetation on the continent through regional variability. In addition, we provide a new mechanism through which most of Antarctica remained ice-free through a wide range of global climatic changes.
Dominik Fahrner, Donald Slater, Aman KC, Claudia Cenedese, David A. Sutherland, Ellyn Enderlin, Femke de Jong, Kristian K. Kjeldsen, Michael Wood, Peter Nienow, Sophie Nowicki, and Till Wagner
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2023-411, https://doi.org/10.5194/essd-2023-411, 2023
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Marine-terminating glaciers can lose mass through frontal ablation, which comprises submarine and surface melting, and iceberg calving. We estimate frontal ablation for 49 marine-terminating glaciers in Greenland by combining existing, satellite derived data and calculating volume change near the glacier front over time. The dataset offers exciting opportunities to study the influence of climate forcings on marine-terminating glaciers in Greenland over multi-decadal timescales.
Valérian Jacques-Dumas, René M. van Westen, Freddy Bouchet, and Henk A. Dijkstra
Nonlin. Processes Geophys., 30, 195–216, https://doi.org/10.5194/npg-30-195-2023, https://doi.org/10.5194/npg-30-195-2023, 2023
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Computing the probability of occurrence of rare events is relevant because of their high impact but also difficult due to the lack of data. Rare event algorithms are designed for that task, but their efficiency relies on a score function that is hard to compute. We compare four methods that compute this function from data and measure their performance to assess which one would be best suited to be applied to a climate model. We find neural networks to be most robust and flexible for this task.
Julia E. Weiffenbach, Michiel L. J. Baatsen, Henk A. Dijkstra, Anna S. von der Heydt, Ayako Abe-Ouchi, Esther C. Brady, Wing-Le Chan, Deepak Chandan, Mark A. Chandler, Camille Contoux, Ran Feng, Chuncheng Guo, Zixuan Han, Alan M. Haywood, Qiang Li, Xiangyu Li, Gerrit Lohmann, Daniel J. Lunt, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, W. Richard Peltier, Gilles Ramstein, Linda E. Sohl, Christian Stepanek, Ning Tan, Julia C. Tindall, Charles J. R. Williams, Qiong Zhang, and Zhongshi Zhang
Clim. Past, 19, 61–85, https://doi.org/10.5194/cp-19-61-2023, https://doi.org/10.5194/cp-19-61-2023, 2023
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We study the behavior of the Atlantic Meridional Overturning Circulation (AMOC) in the mid-Pliocene. The mid-Pliocene was about 3 million years ago and had a similar CO2 concentration to today. We show that the stronger AMOC during this period relates to changes in geography and that this has a significant influence on ocean temperatures and heat transported northwards by the Atlantic Ocean. Understanding the behavior of the mid-Pliocene AMOC can help us to learn more about our future climate.
Amber Boot, Anna S. von der Heydt, and Henk A. Dijkstra
Earth Syst. Dynam., 13, 1041–1058, https://doi.org/10.5194/esd-13-1041-2022, https://doi.org/10.5194/esd-13-1041-2022, 2022
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Atmospheric pCO2 of the past shows large variability on different timescales. We focus on the effect of the strength of Atlantic Meridional Overturning Circulation (AMOC) on this variability and on the AMOC–pCO2 relationship. We find that climatic boundary conditions and the representation of biology in our model are most important for this relationship. Under certain conditions, we find internal oscillations, which can be relevant for atmospheric pCO2 variability during glacial cycles.
Mikael L. A. Kaandorp, Stefanie L. Ypma, Marijke Boonstra, Henk A. Dijkstra, and Erik van Sebille
Ocean Sci., 18, 269–293, https://doi.org/10.5194/os-18-269-2022, https://doi.org/10.5194/os-18-269-2022, 2022
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A large amount of marine litter, such as plastics, is located on or around beaches. Both the total amount of this litter and its transport are poorly understood. We investigate this by training a machine learning model with data of cleanup efforts on Dutch beaches between 2014 and 2019, obtained by about 14 000 volunteers. We find that Dutch beaches contain up to 30 000 kg of litter, largely depending on tides, oceanic transport, and how exposed the beaches are.
Peter D. Nooteboom, Peter K. Bijl, Christian Kehl, Erik van Sebille, Martin Ziegler, Anna S. von der Heydt, and Henk A. Dijkstra
Earth Syst. Dynam., 13, 357–371, https://doi.org/10.5194/esd-13-357-2022, https://doi.org/10.5194/esd-13-357-2022, 2022
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Having descended through the water column, microplankton in ocean sediments represents the ocean surface environment and is used as an archive of past and present surface oceanographic conditions. However, this microplankton is advected by turbulent ocean currents during its sinking journey. We use simulations of sinking particles to define ocean bottom provinces and detect these provinces in datasets of sedimentary microplankton, which has implications for palaeoclimate reconstructions.
Arthur M. Oldeman, Michiel L. J. Baatsen, Anna S. von der Heydt, Henk A. Dijkstra, Julia C. Tindall, Ayako Abe-Ouchi, Alice R. Booth, Esther C. Brady, Wing-Le Chan, Deepak Chandan, Mark A. Chandler, Camille Contoux, Ran Feng, Chuncheng Guo, Alan M. Haywood, Stephen J. Hunter, Youichi Kamae, Qiang Li, Xiangyu Li, Gerrit Lohmann, Daniel J. Lunt, Kerim H. Nisancioglu, Bette L. Otto-Bliesner, W. Richard Peltier, Gabriel M. Pontes, Gilles Ramstein, Linda E. Sohl, Christian Stepanek, Ning Tan, Qiong Zhang, Zhongshi Zhang, Ilana Wainer, and Charles J. R. Williams
Clim. Past, 17, 2427–2450, https://doi.org/10.5194/cp-17-2427-2021, https://doi.org/10.5194/cp-17-2427-2021, 2021
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In this work, we have studied the behaviour of El Niño events in the mid-Pliocene, a period of around 3 million years ago, using a collection of 17 climate models. It is an interesting period to study, as it saw similar atmospheric carbon dioxide levels to the present day. We find that the El Niño events were less strong in the mid-Pliocene simulations, when compared to pre-industrial climate. Our results could help to interpret El Niño behaviour in future climate projections.
Cited articles
Bakalian, F., Hameed, S., and Pickart, R.: Influence of the Icelandic Low latitude on the frequency of Greenland tip jet events: Implications for Irminger Sea convection, J. Geophys. Res., 112, C04020, https://doi.org/10.1029/2006JC003807, 2007.
Biló, T. C., Straneo, F., Holte, J., and Le Bras, I. A.-A.: Arrival of New Great Salinity Anomaly Weakens Convection in the Irminger Sea, Geophys. Res. Lett., 49, e2022GL098857, https://doi.org/10.1029/2022GL098857, 2022.
Coquereau, A., Foukal, N. P., and Våge, K.: Extreme wind events responsible for an outsized role in shelf-basin exchange around the southern tip of Greenland, Sci. Adv., 10, https://doi.org/10.1126/sciadv.adp9266, 2024.
de Jong, M. F. and de Steur, L.: Strong winter cooling over the Irminger Sea in winter 2014–2015, exceptional deep convection, and the emergence of anomalously low SST, Geophys. Res. Lett., 43, 7106–7113, https://doi.org/10.1002/2016GL069596, 2016.
de Jong, M. F., Oltmanns, M., Karstensen, J., and de Steur, L.: Deep Convection in the Irminger Sea Observed with a Dense Mooring Array, Oceanography, 31, 50–59, https://doi.org/10.5670/oceanog.2018.109, 2018.
de Jong, M. F., Fogaren, K. E., Le Bras, I., McRaven, L., and Palevsky, H. I.: Atmospheric Forcing Dominates the Interannual Variability of Convection Strength in the Irminger Sea, J. Geophys. Res. Oceans, 130, e2023JC020799, https://doi.org/10.1029/2023JC020799, 2025.
Desbruyères, D. G., Mercier, H., Maze, G., and Daniault, N.: Surface predictor of overturning circulation and heat content change in the subpolar North Atlantic, Ocean Sci., 15, 809–817, https://doi.org/10.5194/os-15-809-2019, 2019.
Doyle, J. D. and Shapiro, M. A.: Flow response to large-scale topography: the Greenland tip jet, Tellus A, 51, 728–748, https://doi.org/10.3402/tellusa.v51i5.14471, 1999.
DuVivier, A. K. and Cassano, J. J.: Evaluation of WRF Model Resolution on Simulated Mesoscale Winds and Surface Fluxes near Greenland, Mon. Weather Rev., 141, 941–963, https://doi.org/10.1175/MWR-D-12-00091.1, 2013.
DuVivier, A. K., Cassano, J. J., Craig, A., Hamman, J., Maslowski, W., Nijssen, B., Osinski, R., and Roberts, A.: Winter Atmospheric Buoyancy Forcing and Oceanic Response during Strong Wind Events around Southeastern Greenland in the Regional Arctic System Model (RASM) for 1990–2010, J. Clim., 29, 975–994, https://doi.org/10.1175/JCLI-D-15-0592.1, 2016.
Duyck, E. and De Jong, M. F.: Circulation Over the South-East Greenland Shelf and Potential for Liquid Freshwater Export: A Drifter Study, Geophys. Res. Lett., 48, e2020GL091948, https://doi.org/10.1029/2020GL091948, 2021.
Duyck, E., Gelderloos, R., and de Jong, M. F.: Wind-Driven Freshwater Export at Cape Farewell, J. Geophys. Res.-Oceans, 127, e2021JC018309, https://doi.org/10.1029/2021JC018309, 2022.
Fedorov, A. M.: Supporting dataset and visualization scripts: Greenland tip jet and deep convection in the Irminger Sea: disentangling the roles of heat loss and wind stress, OSF [data set], https://osf.io/bj9wn/overview?view_only=a34f660543f1427cad3ed0299ec3b5aa, last access: 4 June 2026.
Fedorov, A. M. and Bashmachnikov, I. L.: Accuracy of the deep convection intensity from a limited number of casts, Dynam. Atmos. Oceans, 92, 101164, https://doi.org/10.1016/j.dynatmoce.2020.101164, 2020.
Fedorov, A. M., Bashmachnikov, I. L., Iakovleva, D. A., Kuznetsova, D. A., and Raj, R. P.: Deep convection in the Subpolar Gyre: Do we have enough data to estimate its intensity?, Dynam. Atmos. Oceans, 101, 101338, https://doi.org/10.1016/j.dynatmoce.2022.101338, 2023.
Fedorov, A. M., Wieners, C. E., de Jong, M. F., and Dijkstra, H. A.: Understanding the Greenland Tip Jet Role in the Future: Declining Surface Heat Loss in a High-Resolution CESM Simulation (2015–99), J. Clim., 38, 4209–4221, https://doi.org/10.1175/JCLI-D-24-0187.1, 2025.
Fu, Y., Lozier, M. S., Biló, T. C., Bower, A. S., Cunningham, S. A., Cyr, F., de Jong, M. F., deYoung, B., Drysdale, L., Fraser, N., Fried, N., Furey, H. H., Han, G., Handmann, P., Holliday, N. P., Holte, J., Inall, M. E., Johns, W. E., Jones, S., Karstensen, J., Li, F., Pacini, A., Pickart, R. S., Rayner, D., Straneo, F., and Yashayaev, I.: Seasonality of the Meridional Overturning Circulation in the subpolar North Atlantic, Commun. Earth Environ., 4, 181, https://doi.org/10.1038/s43247-023-00848-9, 2023.
Gill, A. E.: Atmosphere-Ocean Dynamics, Academic Press, San Diego, 356–359, ISBN 9780080570525, 1982.
Good, P.: Permutation, Parametric and Bootstrap Tests of Hypotheses, Springer-Verlag, New York, https://doi.org/10.1007/b138696, 2005.
Grist, J. P., Josey, S. A., and Sinha, B.: Observed and Projected Changes in North Atlantic Seasonal Temperature Reduction and Their Drivers, J. Geophys. Res. Oceans, 128, e2023JC019837, https://doi.org/10.1029/2023JC019837, 2023.
Howard, L. N.: Note on a paper of John W. Miles, J. Fluid Mech., 10, 509–512, https://doi.org/10.1017/S0022112061000317, 1961.
Jackson, L. C., Kahana, R., Graham, T., Ringer, M. A., Woollings, T., Mecking, J. V., and Wood, R. A.: Global and European climate impacts of a slowdown of the AMOC in a high resolution GCM, Clim. Dyn., 45, 3299–3316, https://doi.org/10.1007/s00382-015-2540-2, 2015.
Josey, S. A. and Schroeder, K.: Declining winter heat loss threatens continuing ocean convection at a Mediterranean dense water formation site, Environ. Res. Lett., 18, 024005, https://doi.org/10.1088/1748-9326/aca9e4, 2023.
Josey, S. A., Jong, M. F., Oltmanns, M., Moore, G. K., and Weller, R. A.: Extreme Variability in Irminger Sea Winter Heat Loss Revealed by Ocean Observatories Initiative Mooring and the ERA5 Reanalysis, Geophys. Res. Lett., 46, 293–302, https://doi.org/10.1029/2018GL080956, 2019.
Koenigk, T., Fuentes-Franco, R., Meccia, V. L., Gutjahr, O., Jackson, L. C., New, A. L., Ortega, P., Roberts, C. D., Roberts, M. J., Arsouze, T., Iovino, D., Moine, M.-P., and Sein, D. V.: Deep mixed ocean volume in the Labrador Sea in HighResMIP models, Clim. Dyn., 57, 1895–1918, https://doi.org/10.1007/s00382-021-05785-x, 2021.
Large, W. G. and Crawford, G. B.: Observations and Simulations of Upper-Ocean Response to Wind Events during the Ocean Storms Experiment, J. Phys. Oceanogr., 25, 2831–2852, https://doi.org/10.1175/1520-0485(1995)025<2831:OASOUO>2.0.CO;2, 1995.
Large, W. G. and Yeager, S. G.: Diurnal to Decadal Global Forcing for Ocean and Sea-Ice Models: The Data Sets and Flux Climatologies, NCAR Technical Note, National Center for Atmospheric Research, Boulder, Colorado, 111 pp., https://doi.org/10.5065/D6KK98Q6, 2004.
Large, W. G., McWilliams, J. C., and Doney, S. C.: Oceanic vertical mixing: A review and a model with a nonlocal boundary layer parameterization, Rev. Geophys., 32, 363–403, https://doi.org/10.1029/94RG01872, 1994.
Li, F., Lozier, M. S., Bacon, S., Bower, A. S., Cunningham, S. A., de Jong, M. F., deYoung, B., Fraser, N., Fried, N., Han, G., Holliday, N. P., Holte, J., Houpert, L., Inall, M. E., Johns, W. E., Jones, S., Johnson, C., Karstensen, J., Le Bras, I. A., Lherminier, P., Lin, X., Mercier, H., Oltmanns, M., Pacini, A., Petit, T., Pickart, R. S., Rayner, D., Straneo, F., Thierry, V., Visbeck, M., Yashayaev, I., and Zhou, C.: Subpolar North Atlantic western boundary density anomalies and the Meridional Overturning Circulation, Nat. Commun., 12, 3002, https://doi.org/10.1038/s41467-021-23350-2, 2021.
Lozier, M. S., Li, F., Bacon, S., Bahr, F., Bower, A. S., Cunningham, S. A., de Jong, M. F., de Steur, L., deYoung, B., Fischer, J., Gary, S. F., Greenan, B. J. W., Holliday, N. P., Houk, A., Houpert, L., Inall, M. E., Johns, W. E., Johnson, H. L., Johnson, C., Karstensen, J., Koman, G., Le Bras, I. A., Lin, X., Mackay, N., Marshall, D. P., Mercier, H., Oltmanns, M., Pickart, R. S., Ramsey, A. L., Rayner, D., Straneo, F., Thierry, V., Torres, D. J., Williams, R. G., Wilson, C., Yang, J., Yashayaev, I., and Zhao, J.: A sea change in our view of overturning in the subpolar North Atlantic, Science, 363, 516–521, https://doi.org/10.1126/science.aau6592, 2019.
Martin, R. and Moore, G. W. K.: Air-sea interaction associated with a Greenland reverse tip jet, Geophys. Res. Lett., 34, L24802, https://doi.org/10.1029/2007GL031093, 2007.
McDougall, T. J. and Barker, P. M.: Getting Started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox, SCOR/IAPSO Working Group 127, 28 pp., ISBN 9780646556215, 2011.
Miles, J. W.: On the stability of heterogeneous shear flows, J. Fluid Mech., 10, 496–508, https://doi.org/10.1017/S0022112061000305, 1961.
Monin, A. S. and Obukhov, A. M.: Basic laws of turbulent mixing in the surface layer of the atmosphere, Trudy Geofizicheskogo Instituta, 163–187, 1954.
Moore, G. W. K.: Gale force winds over the Irminger Sea to the east of Cape Farewell, Greenland, Geophys. Res. Lett., 30, https://doi.org/10.1029/2003GL018012, 2003.
Moore, G. W. K.: A new look at Greenland flow distortion and its impact on barrier flow, tip jets and coastal oceanography, Geophys. Res. Lett., 39, https://doi.org/10.1029/2012GL054017, 2012.
Moore, G. W. K. and Renfrew, I. A.: Tip Jets and Barrier Winds: A QuikSCAT Climatology of High Wind Speed Events around Greenland, J. Clim., 18, 3713–3725, https://doi.org/10.1175/JCLI3455.1, 2005.
Munk, W. H. and Anderson, E. R.: Notes on a theory of the thermocline, J. Mar. Res., 7, 276–295, 1948.
Nansen, F.: The Norwegian North polar expedition, 1893–1896: scientific results, Volume 5, Longmans, Green and Co, London, New York, Bombay, 1906.
Oltmanns, M., Karstensen, J., and Fischer, J.: Increased risk of a shutdown of ocean convection posed by warm North Atlantic summers, Nat. Clim. Change, 8, 300–304, https://doi.org/10.1038/s41558-018-0105-1, 2018.
Outten, S. D., Renfrew, I. A., and Petersen, G. N.: An easterly tip jet off Cape Farewell, Greenland. II: Simulations and dynamics, Q. J. Roy. Meteor. Soc., 135, 1934–1949, https://doi.org/10.1002/qj.531, 2009.
Parras-Berrocal, I. M., Vázquez, R., Cabos, W., Sein, D. V., Álvarez, O., Bruno, M., and Izquierdo, A.: Surface and Intermediate Water Changes Triggering the Future Collapse of Deep Water Formation in the North Western Mediterranean, Geophys. Res. Lett., 49, e2021GL095404, https://doi.org/10.1029/2021GL095404, 2022.
Petit, T., Lozier, M. S., Josey, S. A., and Cunningham, S. A.: Atlantic Deep Water Formation Occurs Primarily in the Iceland Basin and Irminger Sea by Local Buoyancy Forcing, Geophys. Res. Lett., 47, e2020GL091028, https://doi.org/10.1029/2020GL091028, 2020.
Pickart, R. S., Spall, M. A., Ribergaard, M. H., Moore, G. W. K., and Milliff, R. F.: Deep convection in the Irminger Sea forced by the Greenland tip jet, Nature, 424, 152–156, https://doi.org/10.1038/nature01729, 2003a.
Pickart, R. S., Straneo, F., and Moore, G. W. K.: Is Labrador Sea Water formed in the Irminger basin?, Deep-Sea Res. Pt. I, 50, 23–52, https://doi.org/10.1016/S0967-0637(02)00134-6, 2003b.
Pollard, R. T., Rhines, P. B., and Thompson, R. O. R. Y.: The deepening of the wind-mixed layer, Geophysical Fluid Dynamics, 4, 381–404, https://doi.org/10.1080/03091927208236105, 1973.
Price, J. F., Weller, R. A., and Pinkel, R.: Diurnal cycling: Observations and models of the upper ocean response to diurnal heating, cooling, and wind mixing, J. Geophys. Res. Oceans, 91, 8411–8427, https://doi.org/10.1029/JC091iC07p08411, 1986.
Renfrew, I. A., Petersen, G. N., Sproson, D. A. J., Moore, G. W. K., Adiwidjaja, H., Zhang, S., and North, R.: A comparison of aircraft-based surface-layer observations over Denmark Strait and the Irminger Sea with meteorological analyses and QuikSCAT winds, Q. J. Roy. Meteor. Soc., 135, 2046–2066, https://doi.org/10.1002/qj.444, 2009a.
Renfrew, I. A., Outten, S. D., and Moore, G. W. K.: An easterly tip jet off Cape Farewell, Greenland. I: Aircraft observations, Q. J. Roy. Meteor. Soc., 135, 1919–1933, https://doi.org/10.1002/qj.513, 2009b.
Schiller-Weiss, I., Martin, T., and Schwarzkopf, F. U.: Emerging Influence of Enhanced Greenland Melting on Boundary Currents and Deep Convection Regimes in the Labrador and Irminger Seas, Geophys. Res. Lett., 51, e2024GL109022, https://doi.org/10.1029/2024GL109022, 2024.
Schmidt, S. and Send, U.: Origin and Composition of Seasonal Labrador Sea Freshwater, J. Phys. Oceanogr., 37, 1445–1454, https://doi.org/10.1175/JPO3065.1, 2007.
Shkolnik, I. M. and Efimov, S. V: Cyclonic activity in high latitudes as simulated by a regional atmospheric climate model: added value and uncertainties, Environ. Res. Lett., 8, 045007, https://doi.org/10.1088/1748-9326/8/4/045007, 2013.
Somot, S., Sevault, F., and Déqué, M.: Transient climate change scenario simulation of the Mediterranean Sea for the twenty-first century using a high-resolution ocean circulation model, Clim. Dyn., 27, 851–879, https://doi.org/10.1007/s00382-006-0167-z, 2006.
Sproson, D. A. J., Renfrew, I. A., and Heywood, K. J.: Atmospheric conditions associated with oceanic convection in the south-east Labrador Sea, Geophys. Res. Lett., 35, https://doi.org/10.1029/2007GL032971, 2008.
Sproson, D. A. J., Renfrew, I. A., and Heywood, K. J.: A parameterization of Greenland's tip jets suitable for ocean or coupled climate models, J. Geophys. Res. Oceans, 115, https://doi.org/10.1029/2009JC006002, 2010.
Tilinina, N., Gulev, S. K., and Bromwich, D. H.: New view of Arctic cyclone activity from the Arctic system reanalysis, Geophys. Res. Lett., 41, 1766–1772, https://doi.org/10.1002/2013GL058924, 2014.
Våge, K., Pickart, R. S., Moore, G. W. K., and Ribergaard, M. H.: Winter Mixed Layer Development in the Central Irminger Sea: The Effect of Strong, Intermittent Wind Events, J. Phys. Oceanogr., 38, 541–565, https://doi.org/10.1175/2007JPO3678.1, 2008.
Våge, K., Spengler, T., Davies, H. C., and Pickart, R. S.: Multi-event analysis of the westerly Greenland tip jet based upon 45 winters in ERA-40, Q. J. Roy. Meteor. Soc., 135, 1999–2011, https://doi.org/10.1002/qj.488, 2009a.
Våge, K., Pickart, R. S., Thierry, V., Reverdin, G., Lee, C. M., Petrie, B., Agnew, T. A., Wong, A., and Ribergaard, M. H.: Surprising return of deep convection to the subpolar North Atlantic Ocean in winter 2007–2008, Nat. Geosci., 2, 67–72, https://doi.org/10.1038/ngeo382, 2009b.
van Westen, R. M., Vanderborght, E., Kliphuis, M., and Dijkstra, H. A.: Physics-Based Indicators for the Onset of an AMOC Collapse Under Climate Change, J. Geophys. Res. Oceans, 130, e2025JC022651, https://doi.org/10.1029/2025JC022651, 2025.
Viebahn, J. P., von der Heydt, A. S., Le Bars, D., and Dijkstra, H. A.: Effects of Drake Passage on a strongly eddying global ocean, Paleoceanography, 31, 564–581, https://doi.org/10.1002/2015PA002888, 2016.
Zhou, S., Zhai, X., and Renfrew, I. A.: The Impact of High-Frequency Weather Systems on SST and Surface Mixed Layer in the Central Arabian Sea, J. Geophys. Res. Oceans, 123, 1091–1104, https://doi.org/10.1002/2017JC013609, 2018.
Short summary
Deep ocean mixing in the North Atlantic helps power major currents, but it is weakening as the surface warms. We used a high-resolution ocean model and separate experiments that added either extra heat loss, extra wind, or both during Greenland storm events. Extra heat loss caused most of the deep mixing, but strong winds also helped by mixing salty water upward and removing the fresh surface layer early in winter. This wind effect may modulate the future decline of deep mixing.
Deep ocean mixing in the North Atlantic helps power major currents, but it is weakening as the...
