PC33A:
Meridional Overturning Circulation Dynamics in Past Warm and Cold Climates II


Session ID#: 36863

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:  Alice Marzocchi, University of Chicago, Geophysical Sciences, Chicago, IL, United States, Benoit Thibodeau, The University of Hong Kong, Earth Sciences and SWIMS, Hong Kong, Hong Kong, Andrea Burke, University of St. Andrews, School of Earth and Environmental Sciences, St. Andrews, United Kingdom and Juan Muglia, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States
Student Paper Review Liaisons:  Alice Marzocchi, University of Chicago, Geophysical Sciences, Chicago, IL, United States and Benoit Thibodeau, The University of Hong Kong, Earth Sciences and SWIMS, Hong Kong, Hong Kong
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:

Stable Isotope Evidence for North Pacific Deep Water Formation during the mid-Pliocene Warm Period (314186)
Heather L Ford, University of Cambridge, Earth Sciences, Cambridge, United Kingdom, Natalie Burls, George Mason University, Department of Atmospheric, Oceanic, and Earth Sciences, Fairfax, VA, United States and David A Hodell, University of Cambridge, Godwin Laboratory for Palaeoclimate Research, Cambridge, United Kingdom
North Pacific Deep water formation and a Pacific Meridional Overturning Circulation (PMOC) during the warm Pliocene (316283)
Natalie Burls, George Mason University, Department of Atmospheric, Oceanic, and Earth Sciences, Fairfax, VA, United States, Alexey V Fedorov, Yale Univ, New Haven, CT, United States, Daniel Mikhail Sigman, Princeton University, Princeton, NJ, United States, Sam Jaccard, University of Bern, Bern, Switzerland, Heather L Ford, University of Cambridge, Earth Sciences, Cambridge, United Kingdom, Ralf Tiedemann, AWI Bremerhaven, Bremerhaven, Germany and Gerald Hermann Haug, ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland; Max Planck Institute for Chemistry, Mainz, Germany
Elucidating Global Meridional Overturning Circulation in Real and Fake Worlds (322967)
Andy Ridgwell, University of California, Riverside, Department of Earth Sciences, Riverside, CA, United States and Sandra Kirtland Turner, University of California Riverside, Department of Earth Sciences, Riverside, CA, United States
A transient simulation of the last deglaciation (304909)
Ruza F Ivanovic, University of Leeds, School of Earth and Environment, Leeds, LS2, United Kingdom, Paul J Valdes, University of Bristol, Bristol, BS8, United Kingdom, Lauren J Gregoire, University of Leeds, School of Earth and Environment, Leeds, United Kingdom and Andrew D Wickert, University of Minnesota Twin Cities, Earth Sciences, Minneapolis, MN, United States
Asynchronous warming and δ18O evolution of deep Atlantic water masses during the last deglaciation (312442)
Jiaxu Zhang, Los Alamos National Laboratory, Los Alamos, NM, United States; University of Wisconsin Madison, Madison, WI, United States, Zhengyu Liu, Ohio State University Main Campus, Columbus, OH, United States; Ohio State University, Columbus, OH, United States, Esther C Brady, National Center for Atmospheric Research, Boulder, Boulder, CO, United States, Delia Oppo, WHOI, Geology and Geophysics, Woods Hole, MA, United States; Woods Hole Oceanographic Institution, Geology and Geophysics, Woods Hole, MA, United States, Peter U Clark, Oregon State University, Corvallis, OR, United States, Alexandra Jahn, University of Colorado at Boulder, Atmospheric and Oceanic Sciences and INSTAAR, Boulder, CO, United States, Shaun A Marcott, University of Wisconsin-Madison, Madison, WI, United States and Keith T Lindsay, NCAR, Boulder, CO, United States
Assessing the stability of the Atlantic Meridional Overturning Circulation during the last deglaciation (315207)
Wei Liu, University of California Riverside, Earth Sciences, Riverside, CA, United States
Influence of the Freshwater Forcing Pathway on the AMOC during 8.2k Event in a High Resolution Coupled Model (311599)
Aixue Hu1, Bette L Otto-Bliesner2, Justin Small1, Carrie Morrill3, Cecilia M Bitz4 and Nan A Rosenbloom5, (1)National Center for Atmospheric Research, Boulder, CO, United States, (2)National Center for Atmospheric Research, Climate and Global Dynamics Laboratory, Boulder, CO, United States, (3)NOAA's National Centers for Environmental Information, Boulder, CO, United States, (4)University of Washington, Seattle, WA, United States, (5)NCAR/CGD, Boulder, CO, United States
Proxy surrogate reconstructions of Common Era Atlantic meridional overturning circulation (326951)
Casey Saenger, Univ of Washington-JISAO, Seattle, WA, United States, Michael N Evans, University of Maryland College Park, College Park, MD, United States, Allegra N. LeGrande, Columbia University, NASA/GISS, New York, NY, United States, Stephanie C Pennington, University of Maryland College Park, United States, Julia Claire Tindall, University of Leeds, Leeds, United Kingdom, Martin Werner, AWI, Bremerhaven, Germany and Kaustubh Thirumalai, Brown University, Providence, RI, United States

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