HE009
Overturning circulation and water mass transformation in the northern oceans
Session ID#: 259677
Session Description:
The overturning circulation of the northern oceans – including the subpolar North Atlantic, Nordic Seas, and Arctic Ocean – plays a key role in transporting heat, freshwater, and anthropogenic carbon. This session focuses on understanding how water masses are transformed and how the overturning circulation varies and evolves across timescales. We welcome studies on circulation pathways, exchange between basins, and the physical processes involved in water mass transformation, including – but not limited to – air-sea exchange, freshwater input, diapycnal mixing, and horizontal stirring. Mesoscale, submesoscale, and high-frequency processes – including eddies, internal waves, and turbulent mixing – are increasingly recognized for their role in controlling how and where water masses are transformed. All these processes, spanning large and small scales, set the conditions for the formation of dense waters that return southward at depth, influencing the strength and structure of the overturning circulation. Studies may focus on present or past climates, on the mean state or variability, and range from across spatial scales. The session brings together studies aimed at understanding water mass transformation and overturning circulation across spatial and temporal scales, and how the involved processes operate and respond to internal variability and external forcing.
Co-Sponsor(s):
Index Terms:
4504 Air/sea interactions [OCEANOGRAPHY: PHYSICAL]
4520 Eddies and mesoscale processes [OCEANOGRAPHY: PHYSICAL]
4568 Turbulence, diffusion, and mixing processes [OCEANOGRAPHY: PHYSICAL]
4572 Upper ocean and mixed layer processes [OCEANOGRAPHY: PHYSICAL]
Student/Early Career Chair: Kerstin Astrid Bergentz, Scripps Institution of Oceanography, La Jolla, United States
Primary Chair: Leon Chafik, Stockholm University, Department of Meteorology, and Bolin Centre for Climate Research, Stockholm, Sweden
Co-chairs: Harper L. Simmons, University of Washington, Seattle, United States, Leah Johnson, Applied Physics Laboratory University of Washington, Seattle, WA, United States and Paola Moffa-Sanchez, Durham University, Department of Geography, Durham, United Kingdom
Deep Argo Observations of Buoyancy Redistribution in the Atlantic Overturning (1856285)
Damien Desbruyères, LOPS (IFREMER, CNRS, IRD, IUEM), Brest, France, Herle Mercier, IFREMER/CNRS/LOPS, Brest, France, Gregory C Johnson, Pacific Marine Environmental Laboratory, Seattle, United States, Virginie Thierry, IFREMER/LOPS, Plouzané, France and Kjell Arne Mork, Institute of Marine Research Bergen, Bergen, Norway
Regional Dissection of Subpolar North Atlantic Overturning Reveals Complex Spatial Heterogeneity Indicative of Governing Processes (1860660)
Mr. Dennis H. A. Vermeulen, MSc MA1, Renske Gelderloos1 and Caroline A Katsman1,2, (1)Delft University of Technology, Environmental Fluid Mechanics, Delft, Netherlands, (2)Royal Netherlands Meteorological Institute, De Bilt, Netherlands
Arctic Water Mass Transformation in a Pre-Industrial Control Run (1893522)
Charlotte Marris, University of Oxford, Earth Sciences, Oxford, United Kingdom, Helen L Johnson, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, Stephanie Waterman, University of British Columbia, Earth, Ocean and Atmospheric Sciences, Vancouver, BC, Canada and Dafydd Gwyn Evans, National Oceanography Centre, Southampton, UK, Marine Physics and Ocean Climate, Southampton, United Kingdom
The Impact of Boundary Current Hydrography on Deep Mixed-Layer Properties in the Labrador Sea (2007627)
Renske Gelderloos, Delft University of Technology, Delft, Netherlands, Rebecca Frew, Unaffiliated, Reading, United Kingdom, Thomas W N Haine, Johns Hopkins University, Department of Earth and Planetary Sciences, Baltimore, MD, United States and Helen L Johnson, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Underwater Glider Observations of Submesoscale Frontogenesis at the Arctic Front Near Jan Mayen (2010421)
Ricardo B. Bourdon, Virginia Institute of Marine Science, Coastal & Ocean Processes, Gloucester Point, United States, Donglai Gong, Virginia Institute of Marine Science, Gloucester Point, VA, United States and Dr. Laur Ferris, PhD, Applied Physics Laboratory, University of Washington, Seattle, United States
Sudden Stratospheric Warming Alters Dense Water Formation South of Iceland-Scotland Ridge (2010540)
M Dolores Pérez Hernández1, Carlos Argáez2, Jon Albretsen3, Luis Cana-Cascallar1 and Angel Ruiz-Angulo4, (1)Unidad Océano y Clima, Instituto de Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria, ULPGC, Unidad Asociada ULPGC-CSIC, Las Palmas de Gran Canaria, Spain, (2)Laboratorio de Procesos Costeros, Instituto de Ingeniería, UNAM, Sisal, México & Marine and Freshwater Research Institute,, Hafnarfjörður, Iceland, (3)Institute of Marine Research, Norway, Arendal, Norway, (4)Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland
Can the Irminger Current impact restratification in the Irminger Sea?A Lagrangian model study on the fate of the Irminger Current water (2019536)
Nora Fried, NIOZ, Royal Netherlands Institute for Sea Research, Ocean Systems, Texel, Netherlands; Univeristy of Münster, Institue for Landscape Ecology, Münster, Germany, Renske Gelderloos, Delft University of Technology, Delft, Netherlands; Johns Hopkins University, Balitmore, United States, Caroline A Katsman, Delft University of Technology, Environmental Fluid Mechanics, Delft, Netherlands, Oliver Tooth, National Oceanography Centre, Southampton, United Kingdom and Femke de Jong, Royal Netherlands Institute for Sea Research, Texel, Netherlands
Seasonal Variability of Turbulent Mixing in Jan Mayen Channel from High-Resolution Thermistors (2021951)
Grant Meiners1, Jennifer A MacKinnon1, Amy Frances Waterhouse1, Leah Johnson2 and Harper L. Simmons3, (1)University of California San Diego, Scripps Institution of Oceanography, La Jolla, United States, (2)Applied Physics Laboratory University of Washington, Seattle, WA, United States, (3)Applied Physics Laboratory University of Washington, Seattle, United States
Observed Long-Term Changes in the Overturning in the Nordic Seas (2023243)
Ailin Brakstad, University of Bergen, Geophysical Institute, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway, Kjetil Våge, Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway, Marius Årthun, Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway, Geoffrey Gebbie, Woods Hole Oceanographic Institution, Physical Oceanography, Woods Hole, United States and Emil Jeansson, NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
Mechanism of the Atlantic Meridional Overturning Circulation (AMOC) response to the Arctic river runoff change (2023588)
Yuki Koshida, Atmosphere and Ocean Research Institute University of Tokyo, Kashiwa, Japan, Hiroyasu Hasumi, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan and Takao Kawasaki, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanagawa, Japan
A seasonal buoyancy budget for the Nordic Seas (2025410)
Anna-Marie Strehl, University of Bergen, Bergen, Norway and Kjetil Våge, Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway
Mechanisms and variability of the Arctic overturning circulation (2026696)
Carlo Mans1, Marius Årthun1, Jakob Dörr1 and Dafydd Gwyn Evans2, (1)Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway, (2)University of Southampton, Southampton, United Kingdom
Mesoscale Eddies: Key Pathways across the Iceland–Faroe Ridge (2031431)
Angel Ruiz-Angulo, University of Iceland, Reykjavik, Capital Region, ICELAND, Charly de Marez, Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland, Jonathan Gula, Laboratoire d’Océanographie Physique et Spatiale (LOPS), University of Brest, CNRS, Ifremer, IRD, IUEM, Plouzané, France, Leon Chafik, Stockholm University, Department of Meteorology, and Bolin Centre for Climate Research, Stockholm, Sweden, Fabien Roquet, University of Gothenburg, Department of Marine Sciences, Gothenburg, Sweden and Hjálmar Hátún, Faroe Marine Research Institute, Torshavn, Faroe Islands
How Storm Trajectories Impact the Norwegian Atlantic Current: Insights from Observations and a High-Resolution Model (2033927)
Till M. Baumann1,2, Øystein Skagseth1, Randi B. Ingvaldsen3 and Clemens Spensberger4, (1)Institute of Marine Research Bergen, Bergen, Norway, (2)Bjerknes Centre for Climate Research, Bergen, Norway, (3)Institute of Marine Research, Bergen, Norway, (4)University of Bergen, Geophysical Institute, Bergen, Norway
Transport and modification of overflow waters in the subpolar North Atlantic (2038784)
William Johns1, Emma Worthington2, Amy S Bower3, Femke de Jong4, Johannes Karstensen5, Robert S Pickart6, Greg Koman7, Nora Fried8, Fehmi Dilmahamod9, Jie Huang6 and Astrid Pacini10, (1)Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, UNITED STATES, (2)National Oceanography Centre, Southampton, United Kingdom, (3)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (4)Royal Netherlands Institute for Sea Research, Texel, Netherlands, (5)Helmholtz Centre for Ocean Res, Kiel, Germany, (6)Woods Hole Oceanographic Institution, Woods Hole, United States, (7)University of Massachusetts Boston, School for the Environment, Boston, United States, (8)Royal Netherlands Institute for Sea Research & Utrecht University, Texel, Netherlands, (9)GEOMAR Helmholtz Center for Ocean Research, Kiel, Germany, (10)Applied Physics Laboratory University of Washington, Seattle, United States
