PP026
Orbital Forcing of Climate and the mid-Pleistocene Transition

Session ID#: 82051

Session Description:
Climate archives, based on records of oxygen isotopes from marine sediments, show a pronounced change in the periodicity of the glacial cycles during the mid-Pleistocene (~1 million years ago). Before this time, and possibly from the initiation of major glaciations, the periodicity is dominated by the 41 kyr obliquity cycle of orbital insolation. However, in the past million years the ~21 and ~100 kyr cycles of precession and eccentricity have dominated the records of glacial cycles, and the records of atmospheric greenhouse gasses. 

This climate transition, the mid-Pleistocene Transition (MPT), is not fully understood. Nor are the dynamics of the glacial cycles. In this session we welcome contributions with perspectives on the MPT as well as the dynamics of the glacial cycles based on proxy records, theory and models. The topic is also timely in light of ongoing efforts to extract a continuous Antarctic ice core record spanning the MPT.

Index Terms:

4926 Glacial [PALEOCEANOGRAPHY]
4930 Greenhouse gases [PALEOCEANOGRAPHY]
4932 Ice cores [PALEOCEANOGRAPHY]
4946 Milankovitch theory [PALEOCEANOGRAPHY]

Primary Convener:  Eivind Olavson Straume, CEED, University of Oslo, Oslo, Norway
Conveners:  Anne L. Moree, University of Bergen, Bergen, Norway, Kerim Hestnes Nisancioglu, University of Bergen and the Bjerknes Centre for Climate Research, Bergen, Norway and Geoffrey Gebbie, Woods Hole Oceanographic Inst., Woods Hole, MA, United States
Primary Liaison:  Kerim Hestnes Nisancioglu, University of Bergen and the Bjerknes Centre for Climate Research, Bergen, Norway
 
Cancellation of the precessional cycle in δ18O records during the Early Pleistocene (491409)
Anne L. Moree, Geophysical Institute, University of Bergen and the Bjerknes Centre for Climate Research, Bergen, Norway, Tianyi Sun, Institute for Geophysics, Jackson School of Geosciences, the University of Texas at Austin, Austin, TX, United States, Anaïs Bretones, Department of Earth Science, University of Bergen and the Bjerknes Centre for Climate, Bergen, Norway, Eivind Olavson Straume, Centre for Earth Evolution and Dynamics (CEED), Department of geosciences , University of Oslo, Oslo, Norway, Kerim Hestnes Nisancioglu, University of Bergen and the Bjerknes Centre for Climate Research, Bergen, Norway and Geoffrey Gebbie, Woods Hole Oceanographic Institute, Woods Hole, United States
 
The Mid-Pleistocene Transition: The Inevitable Result of Long-term Evolution of the East Antarctic Ice Sheet? (Invited) (506340)
Maureen E Raymo1, Claire E Jasper2, Mallory Mintz3, Blake Dyer1, Stephen Richard Meyers4, Lorraine E Lisiecki5, Jonathan Warnock6, Iván Hernández-Almeida7, Trevor Williams8, Michael Weber9 and IODP Expedition 382 Scientists, (1)Lamont-Doherty Earth Obs., New York, NY, United States, (2)Lamont Doherty Earth Observatory, Palisades, NY, United States, (3)Lamont-Doherty Earth Observatory, New York, NY, United States, (4)Univ. of Wisconsin - Madison, Geoscience, Madison, WI, United States, (5)University of California Santa Barbara, Earth Science, Santa Barbara, CA, United States, (6)Beloit College, Beloit, WI, United States, (7)ETH Zurich, Zurich, Switzerland, (8)Lamont Doherty Earth Obs, Palisades, NY, United States, (9)University of Bonn, Bonn, Germany
 
The Mid Pleistocene Transition diatom record from the Japan Sea (511398)
Cristina Lopes, Instituto Português do Mar e da Atmosfera, Lisboa, Portugal and Cristina Prates Laranjinha Ventura, Centro de Ciencias do Mar, Faro, Portugal
 
Precession pacing of 100-ky glacial variability over the past 2.6 Ma (512311)
Parker Liautaud, Harvard University, Cambridge, MA, United States, David A Hodell, University of Cambridge, Godwin Laboratory for Palaeoclimate Research, Cambridge, United Kingdom and Peter J Huybers, Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States
 
A Subtropical View on Glacial Variability During the Early to Middle Pleistocene – IODP Site U1387 in the Gulf of Cadiz (NE Atlantic) (512454)
Antje H L Voelker1,2, Aline Mega1, Emilia Salgueiro1,2, Teresa Rodrigues1,2 and Henning Kuhnert3, (1)Instituto Português do Mar e da Atmosfera (IPMA), Divisão de Geologia e Georecursos Marinhos, Alges, Portugal, (2)Centro de Ciencias do Mar (CCMAR), Faro, Portugal, (3)MARUM - University of Bremen, Bremen, Germany
 
Mid-Pleistocene carbon cycle changes in the ocean and atmosphere. (Invited) (536712)
Thomas Ben Chalk1, Gavin L Foster2, Mathis Hain3,4, Elwyn de la Vega3, Eelco Johan Rohling3, Paul A Wilson2 and Soraya G Cherry3, (1)University of Southampton, Southampton, SO14, United Kingdom, (2)University of Southampton, Ocean and Earth Science, Southampton, United Kingdom, (3)University of Southampton, Southampton, United Kingdom, (4)University of California Santa Cruz, Santa Cruz, United States
 
Deciphering orbital to centennial-scale changes in Mediterranean Outflow Water during the late Pleistocene (575693)
Lucas Joost Lourens1, Stefanie Kaboth1,2, Gert-Jan Reichart3 and Joey H.P.C. Mandemaker4, (1)Utrecht University, Utrecht, Netherlands, (2)University of Potsdam, Institute for Geosciences, Potsdam-Golm, Germany, (3)Royal Netherlands Institute for Sea Research, Den Burg, Netherlands, (4)Utrecht University, Earth Sciences, Utrecht, Netherlands
 
Asian summer monsoon circulation contributed to mid-Pleistocene transition (577879)
Zeke Zhang1, Weijian Zhou2, Gaojun Li3 and Zhisheng An2, (1)IEE Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, (2)State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, (3)Nanjing University, Nanjing, China
 
Did Indonesian Throughflow changes affect the MOC during the MPT? New data from the Eastern Indian Ocean (580823)
Benjamin Petrick1, Alfredo Martinez-Garcia1, Gerald Auer2, Lars Reuning3, Alexandra Auderset1, Hanaa Deik4, Hideko Takayanagi5, David De Vleeschouwer6, Yasufumi Iryu7 and Gerald Hermann Haug1,8, (1)Max Planck Institute for Chemistry, Mainz, Germany, (2)University of Graz, Department of Geobiology and Palaeoecology, Graz, Austria, (3)RWTH Aachen University, Aachen, Germany, (4)RWTH Aachen University, Geological Institute, Aachen, Germany, (5)Tohoku University, Sendai, Japan, (6)MARUM - University of Bremen, Bremen, Germany, (7)Tohoku Univ, Sendai, Japan, (8)ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland
 
Using Linear Reconstructions to Examine the Relative Effects of Variations in Obliquity and Precession on Climate (589663)
Grainne O'Neill, Rutgers University New Brunswick, Graduate Program in Atmospheric Science, New Brunswick, NJ, United States and Anthony J Broccoli, Rutgers University New Brunswick, New Brunswick, NJ, United States
 
Nonlinear Analysis of the Climate Response to Astronomical Forcing before and after Mid-Pleistocene Transition (595478)
Daniel Coca, University of Sheffield, Sheffield, S10, United Kingdom and Eliza Condrea, University of Sheffield, Sheffield, United Kingdom
 
Orbital-scale dynamics of Arctic temperature variability across the Pleistocene at Lake El’gygytgyn, Siberia (598500)
William Daniels1, Isla S. Castañeda2, Julie Brigham-Grette3, Jeffrey Salacup4, Helen Habicht2, Benjamin Andrew Keisling2, Gregory de Wet5, Daniel S Miller6, Rebecca Anne Smith7 and Kurt Lindberg8, (1)University of Massachusetts Amherst, Amherst, MA, United States, (2)UMass Amherst-Geosciences, Amherst, MA, United States, (3)Univ Massachusetts, Amherst, MA, United States, (4)University of Massachusetts Amherst, Department of Geosciences, Amherst, MA, United States, (5)University of Massachusetts, Amherst, Sunderland, MA, United States, (6)University of Massachusetts, Amherst, MA, United States, (7)Bates College, Geology, Lewiston, ME, United States, (8)University of Massachusetts Amherst, Geosciences, Amherst, MA, United States
 
Multiple Equilibria in a Fully Coupled Carbon-Climate Model (600994)
Fangze Zhu and Brian E J Rose, SUNY at Albany, Albany, NY, United States
 
Identification of substantial precession variability in early-Pleistocene glacial cycles supports a continuous Milankovitch-type response to insolation forcing (610390)
Peter J Huybers, Harvard University, Department of Earth and Planetary Sciences, Cambridge, MA, United States, Parker Liautaud, Harvard University, Cambridge, MA, United States and David A Hodell, University of Cambridge, Godwin Laboratory for Palaeoclimate Research, Cambridge, United Kingdom
 
Mid-Pleistocene Hydroclimate of Southern Africa Inferred From Terrigenous Marine Sediment Geochemistry (624282)
Allison M Franzese, CUNY Hostos Community College, Natural Sciences, Bronx, NY, United States, Bryan Fefe, Hostos Community College, Natural Sciences Department, Bronx, NY, United States, Romilly MacAran, George Mason University, Fairfax, VA, United States, Sidney R Hemming, Lamont-Doherty Earth Observ, Palisades, NY, United States, Chiza N Mwinde, Smith College, Northampton, MA, United States, Daniel P Babin, Lamont -Doherty Earth Observatory, Palisades, United States, Steven L Goldstein, Columbia University, Department of Earth and Environmental Sciences, New York, NY, United States and Ian R Hall, Cardiff University, School of Earth and Ocean Sciences, Cardiff, CF24, United Kingdom
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