PC34B:
Meridional Overturning Circulation Dynamics in Past Warm and Cold Climates III Posters


Session ID#: 29792

Session Description:
The meridional overturning circulation (MOC) is a key component of the global climate system, as it modulates the transport and storage of both heat and carbon. Changes in deep-ocean circulation are thought to have played a key role in past climatic transitions, such as between glacial and interglacial periods. However, reaching a quantitative understanding of the dynamics that contributed to these changes, remains a major challenge in climate research. The MOC’s response to current climate trends is also an unknown when assessing future global ocean-climate-carbon cycle interactions. Investigating how the MOC varied in the past can provide crucial information on the mechanisms and drivers of its variability, as well as on the possible impacts of future circulation changes. This multidisciplinary session will facilitate discussions between the modeling and data communities, with the aim to explore both the transient and equilibrium response of the MOC to different forcing scenarios. We welcome contributions from both proxy-based studies to reconstruct past changes, and those exploring these dynamics from a mechanistic perspective, spanning from theoretical approaches to fully-coupled numerical modeling efforts. We especially encourage combined model-data analyses, as well as studies investigating past periods that could be viewed as analogues for future climates.
Primary Chair:  Alice Marzocchi, University of Chicago, Geophysical Sciences, Chicago, IL, United States
Co-chairs:  Benoit Thibodeau, The University of Hong Kong, Earth Sciences and SWIMS, Hong Kong, Hong Kong, Juan Muglia, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States and Andrea Burke, University of St Andrews, School of Earth and Environmental Sciences, St Andrews, KY16, United Kingdom
Moderators:  Benoit Thibodeau, The University of Hong Kong, Earth Sciences and SWIMS, Hong Kong, Hong Kong, Juan Muglia, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States and Alice Marzocchi, University of Chicago, Geophysical Sciences, Chicago, IL, United States
Student Paper Review Liaisons:  Benoit Thibodeau, The University of Hong Kong, Earth Sciences and SWIMS, Hong Kong, Hong Kong and Alice Marzocchi, University of Chicago, Geophysical Sciences, Chicago, IL, United States
Index Terms:

1616 Climate variability [GLOBAL CHANGE]
4255 Numerical modeling [OCEANOGRAPHY: GENERAL]
4532 General circulation [OCEANOGRAPHY: PHYSICAL]
4962 Thermohaline [PALEOCEANOGRAPHY]
Cross-Topics:
  • BN - Biogeochemistry and Nutrients
  • HE - High Latitude Environments
  • OM - Ocean Modeling
  • PL - Physical Oceanography: Mesoscale and Larger

Abstracts Submitted to this Session:

Coupling the overturning circulation to sea ice in the Southern Ocean: Variability from seasons to millennia (Invited) (315722)
Andrew F Thompson1, Harrison Alexander Parker1 and Emily Rose Newsom2, (1)California Institute of Technology, Pasadena, CA, United States, (2)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Sea Ice Control on the Depth of the Atlantic Meridional Overturning Circulation. (322343)
Louis-Philippe Nadeau, University of Quebec at Rimouski UQAR, Rimouski, QC, Canada, Raffaele M Ferrari, MIT, Cambridge, MA, United States and Malte Jansen, The University of Chicago, Geophysical Sciences, Chicago, IL, United States
Antarctic Sea Ice Control on Circulation Changes and Decreased Ventilation in the Glacial Deep Ocean (309322)
Alice Marzocchi and Malte Jansen, University of Chicago, Geophysical Sciences, Chicago, IL, United States
Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? (307178)
Shantong Sun, Scripps Institution of Oceanography, La Jolla, CA, United States, Ian Eisenman, University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States and Andrew Stewart, University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, CA, United States
The impact of Last Glacial Maximum tidal dissipation changes on global ocean circulation (322978)
Sophie-Berenice Wilmes1, Andreas Schmittner1 and Mattias Green2, (1)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (2)Bangor University, School of Ocean Sciences, Bangor, LL59, United Kingdom
The Sensitivity of the AMOC to Decreasing Greenhouse Gas Concentrations with Glacial and Modern Ice Sheets (310240)
Marlene Klockmann, Uwe Mikolajewicz and Jochem Marotzke, Max Planck Institute for Meteorology, Hamburg, Germany
Glacial ocean carbon maximized by weak circulation and high nutrient utilization (306070)
Juan Muglia1, Luke Skinner2 and Andreas Schmittner1, (1)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (2)Department of Earth Sciences, Univ. of Cambridge, Cambridge, United Kingdom
Benthic 14C ages record upper deep-water formation in the Norwegian Sea during late LGM and Heinrich Stadial 1 (308519)
Michael Sarnthein, University of Kiel, Kiel, Germany, Kevin Küssner, Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany, Pieter M Grootes, Christian Albrechts Univ, Kiel, Germany and Ralf Tiedemann, AWI Bremerhaven, Bremerhaven, Germany
Mg/Li-derived Intermediate Water Temperatures Record Atlantic Meridional Overturning Circulation Variability During the Last Deglaciation (320099)
Shannon Valley1, Jean Lynch-Stieglitz1 and Thomas M Marchitto Jr2, (1)Georgia Institute of Technology Main Campus, Earth and Atmospheric Sciences, Atlanta, GA, United States, (2)Univ Colorado, Boulder, CO, United States
Variability in the Nordic Sea stratification during past interglacials: Any relevance to AMOC? (309770)
Benoit Thibodeau, The University of Hong Kong, Earth Sciences and SWIMS, Hong Kong, Hong Kong, Henning A Bauch, Academy of Sciences, Humanities, and Literature, Mainz, Germany, Adina Paytan, UCSC-Inst Marine Sciences, Santa Cruz, CA, United States, Thomas F Pedersen, University of Victoria, Victoria, BC, Canada and Andreas Schmittner, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States
Modelling the onset of North Atlantic Deep Water formation across the Eocene-Oligocene Transition (316546)
David Karel Hutchinson1, Agatha M De Boer1, Helen Katherine Coxall2, Rodrigo Caballero1 and Johan Nilsson3, (1)Stockholm University, Stockholm, Sweden, (2)Stockholm University, Department of Geological Sciences, Stockholm, Sweden, (3)Stockholm University, Department of meteorology, Stockholm, Sweden
Stalagmite records and model simulation indicating wet conditions in northwestern Madagascar during the 8.2 ka event (322378)
Ny Riavo Gilbertinie Voarintsoa1,2, Ilkka Seppo Olavi Matero3, Lauren J Gregoire4, L. Bruce Railsback1, Julia Claire Tindall5, Louise C Sime6, Hai Cheng7, R. Lawrence Edwards8, George A. Brook9, Gayatri Kathayat7, Xianglei Li7, Amos Fety Michel Rakotondrazafy10 and Marie Olga Madison Razanatseheno10, (1)University of Georgia, Department of Geology, Athens, GA, United States, (2)The Hebrew University of Jerusalem, Institute of Earth Sciences, Jerusalem, Israel, (3)University of Leeds, School of Earth and Environment, Leeds, LS2, United Kingdom, (4)University of Leeds, School of Earth and Environment, Leeds, United Kingdom, (5)University of Leeds, Leeds, United Kingdom, (6)Ice Dynamics and Paleoclimate, British Antarctic Survey, Cambridge, United Kingdom, (7)Xi’an Jiaotong University, Institute of Global Environmental Change, Xi'an, China, (8)University of Minnesota, Department of Earth Sciences, Minneapolis, MN, United States, (9)University of Georgia, Department of Geography, Athens, GA, United States, (10)Université d'Antananarivo, Sciences de la Terre et de l'Environnement, Antananarivo, Madagascar

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