PP21E:
Mechanisms and Drivers of Atlantic Meridional Overturning Circulation (AMOC) Structure and Variability in Past Climate Change and Their Impact on Climate and Biogeochemistry Posters


Submit an Abstract to this Session


Session ID#: 49492

Session Description:
The structure and strength of Atlantic Meridional Overturning Circulation (AMOC) affect surface temperature and precipitation patterns around the globe by regulating the transport of heat, freshwater and carbon. Past reconstructions indicates significant variations in past AMOC and more recent observations suggest a considerably weaker strength today. The mechanisms leading to past changes in AMOC are still poorly constrained. Our ability to predict anthropogenic climate change and future impact, therefore, depends critically on our understanding of AMOC structure, variability and sensitivity to previous climate changes. This interdisciplinary session aims to bring together paleoproxy records (e.g., d13C, 231Pa/230Th, and εNd, among others), modelling studies, as well as novel methodologies that combine both approaches, to characterize the spatial structure and temporal variability of the past AMOC on glacial-interglacial to multi-decadal timescales up to the last millennial that further advances our understanding of its impact on climate and ocean biogeochemistry.
Primary Convener:  Jerry Tjiputra, Bjerknes Centre for Climate Research, Bergen, Norway
Convener:  Feng He, University of Wisconsin-Madison, Center for Climatic Research, Madison, United States
Primary Liaison:  Feng He, University of Wisconsin-Madison, Center for Climatic Research, Madison, United States
Chairs:  Jerry Tjiputra, NORCE Climate, Bergen, Norway and Feng He, University of Wisconsin-Madison, Center for Climatic Research, Madison, United States
OSPA Liaison:  Jerry Tjiputra, NORCE Climate, Bergen, Norway

Cross-Listed:
  • B - Biogeosciences
  • GC - Global Environmental Change
  • OS - Ocean Sciences
Index Terms:

1616 Climate variability [GLOBAL CHANGE]
1626 Global climate models [GLOBAL CHANGE]
4901 Abrupt/rapid climate change [PALEOCEANOGRAPHY]
4912 Biogeochemical cycles, processes, and modeling [PALEOCEANOGRAPHY]

Abstracts Submitted to this Session:

Variability of the intermediate-depth Deep Western Boundary Current at the Carolina Slope since the Last Glacial Maximum from mean sortable silt size (418427)
Sharon Susanna Hoffmann, University of North Carolina at Wilmington, Wilmington, NC, United States, Jerry F McManus, Columbia U. / LDEO, Palisades, United States and Emerson T. Swank, University of North Carolina at Wilmington, Earth and Ocean Sciences, Wilmington, NC, United States
A Pliocene perspective on ocean circulation and nutrients: the role of Pacific overturning on Earth system timescales (432433)
Peter Jacobs, George Mason University, Environmental Science and Policy, Fairfax, VA, United States, Natalie Burls, George Mason University, Atmospheric, Oceanic and Earth Sciences, Fairfax, VA, United States, Alexandra Jahn, University of Colorado Boulder, Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research (INSTAAR), Boulder, United States and Heather L Ford, University of Cambridge, Earth Sciences, Cambridge, United Kingdom
AMOC variability before, during, and after the Northern Hemisphere Glaciation onset from Nd isotopes (434312)
Erin Ann Gregoire1, Karla P Knudson2, Steven L Goldstein3, Joohee Kim4, Leopoldo D Pena5 and Maayan Yehudai2, (1)Lamont -Doherty Earth Observatory, Palisades, NY, United States, (2)Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States, (3)Lamont-Doherty Earth Observatory, Palisades, NY, United States, (4)Lamont-Doherty Earth Observatory of Columbia University, Palisades, United States, (5)Universitat de Barcelona. Facultat de Ciencies de la Terra, Dinàmica de la Terra i de l'Oceà, Barcelona, Spain
Characterizing the Formation of North Atlantic Deepwater through Marine Proxies (388113)
Ria Sarkar, Rutgers University New Brunswick, Earth and Planetary Sciences, New Brunswick, United States, Lauren Neitzke Adamo, Rutgers University New Brunswick, Department of Earth and Planetary Sciences, New Brunswick, NJ, United States and James Wright, Rutgers University, Department of Earth and Planetary Sciences, New Brunswick, United States
North Atlantic Last Glacial Maximum Salinity Reconstruction (460403)
Kira Homola1, Arthur J Spivack2, Richard W Murray3 and Robert A. Pockalny2, (1)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (2)University of Rhode Island, Graduate School of Oceanography, Narragansett, United States, (3)Boston Univ, Boston, MA, United States
REU: Changes in benthic foraminifera assemblage preservation associated with onset of deep AMOC during the last deglaciation (452033)
Robert K Poirier, Lamont -Doherty Earth Observatory, Biology and Paleoenvironment, Palisades, NY, United States, Madison Q Gaetano, College of William and Mary, Geology, Williamsburg, United States, Kimberly Acevedo, Dominican College of Blauvelt, Biology, Orangeburg, United States, Reinhard Kozdon, Columbia University, Lamont Doherty Earth Observatory, Palisades, NY, United States and Maureen E Raymo, Lamont-Doherty Earth Observatory, Palisades, NY, United States
Grain Size Constraints on Glacial Circulation from the Vema Channel and Brazil Margin, Southwest Atlantic (432188)
Philip Ellis1, Peter Timothy Spooner1 and David Thornalley2, (1)University College London, Dept. of Geography, London, United Kingdom, (2)University College London, Department of Geography, London, United Kingdom
Intermediate water regime shifts in the Florida Straits over the last 34 kyr (421686)
Shannon Valley, Georgia Institute of Technology Main Campus, Earth and Atmospheric Sciences, Atlanta, GA, United States, Jean Lynch-Stieglitz, Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA, United States and Thomas M Marchitto Jr, Univ Colorado, Boulder, United States
Influence of the South Atlantic Meridional Heat Transport on the ITCZ Location and South American Monsoon During the Last 21k. (464611)
Igor Stivanelli Custodio1, Pedro da Silva Dias1 and Ilana C Wainer2, (1)IAG Institute of Astronomy, Geophysics and Atmospheric Sciences, Sao Paulo, Brazil, (2)University of Sao Paulo, Sao Paulo, Brazil
Inter-annual to Multi-centennial Variabilities of Simulated AMOC in an Earth System Model (445357)
Yanchun He1, Yongqi Gao1, Jerry Tjiputra2, Mats Bentsen3 and Helene R. Langehaug1, (1)Nansen Environmental and Remote Sensing Center, Bergen, Norway, (2)NORCE Climate, Bergen, Norway, (3)Uni Climate, Uni Research Ltd., Bergen, Norway
Mechanisms and Impacts of a Partial AMOC Recovery Under Enhanced Climate Forcing (418689)
Matthew David Thomas, UCAR Geophysical Fluid Dynamics Laboratory, Princeton, United States and Alexey V Fedorov, Yale University, Earth and Planetary Sciences, New Haven, CT, United States
Overturning Circulation and atmospheric CO2 variations under varying Southern ocean climate and geometrical setups (414647)
Jonathan Baker1, Andrew J. Watson2 and Geoffery K Vallis2, (1)University of Exeter, Exeter, EX4, United Kingdom, (2)University of Exeter, Exeter, United Kingdom
How do changes in overturning circulation affect large-scale carbon isotope distributions? (442881)
Jennifer Dentith, University of Leeds, Leeds, LS2, United Kingdom, Lauren J Gregoire, University of Leeds, School of Earth and Environment, Leeds, United Kingdom, Julia Claire Tindall, University of Leeds, Leeds, United Kingdom and Ruza F Ivanovic, University of Leeds, School of Earth and Environment, Leeds, LS2, United Kingdom
Breakdown of the North Atlantic Age-AOU Relationship (449419)
Jordan L Thomas1, Darryn Waugh1 and Anand Gnanadesikan2, (1)Johns Hopkins University, Earth and Planetary Sciences, Baltimore, MD, United States, (2)Johns Hopkins University, Earth & Planetary Sciences, Baltimore, MD, United States
Exploring the relationships of North Atlantic sea surface temperature anomalies at high and low latitudes with North Atlantic Oscillation variability over recent centuries from paleoclimate proxy data (464283)
Kelly H Kilbourne1, Zoraida P. Perez Delgado2, Hunter Hughes2, Agraj Khare2 and Edward Hobbs2, (1)University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, United States, (2)University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, MD, United States
Palynological Criteria for Identification of Abrupt Climate Change During Heinrich Event 1 (463207)
Irina Delusina, University of California Davis, The Earth and Planetary Sciences, Davis, CA, United States and Kenneth L Verosub, Univ California Davis, Davis, CA, United States
AMOC Response to Dust Reduction and Green Sahara during the Mid-Holocene (390198)
Ming Zhang, Peking University, Beijing, China and Yonggang Liu, Peking University, Department of Atmospheric and Oceanic Sciences, School of Physics, Beijing, China

See more of: Paleoceanography and Paleoclimatology