PC33A:
Long-Term Changes of the Deep-Ocean Overturning Circulation: Past and Future I

Session ID#: 92910

Session Description:
As a key component of the climate system, the deep-ocean overturning circulation, with its interconnected branches in the Atlantic, Indian, Pacific, and Southern Oceans regulates the global transport of heat, freshwater and carbon. Paleo-reconstructions indicate that long-term variations in the meridional overturning circulation (MOC), from centennial, millennial, to even longer timescales, have played a pivotal role in past climate changes. Nevertheless, an understanding of the mechanisms that drive these long-term variations remains a major challenge in climate research. Our ability to predict future MOC variability and anthropogenic climate change, meanwhile, depends critically on our understanding of the mechanisms of MOC variability during past climatic changes. This interdisciplinary session aims to bring together theoretical, modeling and observational studies, as well as novel methodologies that combine above approaches, to study the spatial-temporal structures, mechanisms, and impacts of long-term changes of the MOC in the past and future.
Co-Sponsor(s):
  • HE - High Latitude Environments
  • OM - Ocean Modeling
  • PL - Physical Oceanography: Mesoscale and Larger
Index Terms:

1620 Climate dynamics [GLOBAL CHANGE]
4901 Abrupt/rapid climate change [PALEOCEANOGRAPHY]
4928 Global climate models [PALEOCEANOGRAPHY]
4962 Thermohaline [PALEOCEANOGRAPHY]
Primary Chair:  Wei Liu, University of California Riverside, Riverside, CA, United States
Co-chairs:  Zhengyu Liu, Ohio State University Main Campus, Columbus, OH, United States, Malte Jansen, University of Chicago, Department of the Geophysical Sciences, Chicago, IL, United States and Sophia Hines, Lamont -Doherty Earth Observatory, Palisades, United States
Primary Liaison:  Wei Liu, University of California Riverside, Riverside, CA, United States
Moderators:  Wei Liu, University of California Riverside, Riverside, CA, United States and Malte Jansen, University of Chicago, Department of the Geophysical Sciences, Chicago, IL, United States
Student Paper Review Liaisons:  Zhengyu Liu, The Ohio State University, Department of Geography, Columbus, United States and Sophia Hines, Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, United States

Abstracts Submitted to this Session:

PC33A-01
Glacial overturning circulation structure and Agulhas Leakage from Nd isotope and K/Ar measurements in the Cape Basin (652381)
Sophia Hines1, Allison M Franzese2,3, Chiza N Mwinde4, Steven L Goldstein1, Christopher D Charles5, Ian R Hall6 and Sidney R Hemming1, (1)Lamont-Doherty Earth Observatory, Palisades, United States, (2)CUNY Hostos Community College, Natural Sciences, Bronx, United States, (3)Organization Not Listed, Washington, United States, (4)Smith College, Northampton, MA, United States, (5)Scripps Institution of Oceanography, La Jolla, CA, United States, (6)Cardiff University, School of Earth and Environmental Sciences, Cardiff, CF24, United Kingdom
PC33A-02
Role of Antarctic sea ice on deep ocean circulation and ventilation in glacial-interglacial climates (653337)
Sandy O Gregorio1, Louis-Philippe Nadeau1, Raffaele M Ferrari2 and Jonathan Maitland Lauderdale3, (1)University of Quebec at Rimouski UQAR, ISMER, Rimouski, QC, Canada, (2)MIT, Cambridge, United States, (3)Massachusetts Institute of Technology, Department of Earth, Atmospheric and Planetary Sciences, Cambridge, United States
PC33A-03
Multiple proxies needed to reconstruct the Atlantic Water Masses and AMOC during the Last Glacial Maximum (644840)
Sifan Gu, Ocean University of China, Qingdao, China, Zhengyu Liu, The Ohio State University, Department of Geography, Columbus, United States, Delia Oppo, WHOI, Geology and Geophysics, Woods Hole, United States, Jean Lynch-Stieglitz, Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA, United States, Alexandra Jahn, University of Colorado at Boulder, Atmospheric and Oceanic Sciences and INSTAAR, Boulder, CO, United States, Jiaxu Zhang, Los Alamos National Laboratory, Los Alamos, NM, United States and Lixin Wu, Key Laboratory of Physical Oceanography and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao, China
PC33A-05
North Atlantic radiocarbon constraints on ocean circulation over the last deglaciation (656448)
Andrea Burke, University of St Andrews, School of Earth and Environmental Sciences, St Andrews, KY16, United Kingdom, James William Buchanan Rae, University of St Andrews, School of Earth & Environmental Sciences, St Andrews, United Kingdom, Rosanna Greenop, University of St Andrews, School of Earth and Environmental Sciences, St Andrews, United Kingdom, Paula J Reimer, Queen's University Belfast, Belfast, BT9, United Kingdom and Tim Heaton, University of Sheffield, Sheffield, United Kingdom
PC33A-06
Indo-Pacific Control on Ocean Overturning Across Climates (649773)
Jess F Adkins1, Emily Rose Newsom2, Eric Galbraith3 and Andrew F Thompson1, (1)California Institute of Technology, Pasadena, CA, United States, (2)California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States, (3)Autonomous University of Barcelona, Cerdanyola del Vallès (Bellaterra), Spain
PC33A-07
Mechanisms and Impacts of a Partial AMOC Recovery Under Enhanced Freshwater Forcing (654645)
Matthew David Thomas, UCAR Geophysical Fluid Dynamics Laboratory, Princeton, United States and Alexey V Fedorov, Yale University, New Haven, United States
PC33A-08
Air-sea interaction amplifies the AMOC response to global warming (644551)
Oluwayemi A. Garuba1, Wilbert Weijer2 and Philip J Rasch1, (1)Pacific Northwest National Laboratory, Richland, WA, United States, (2)Los Alamos National Laboratory, Los Alamos, NM, United States
See more of: Past, Present and Future Climate