PP14A:
Abrupt Climate Change: Causes, Mechanisms, and Consequences III

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Session ID#: 17688

Session Description:
Abrupt climate changes have occurred throughout the Late Quaternary, in both glacial and interglacial states, and may offer important insights on future climate change. Yet there is debate about their cause, the mechanisms involved, and their wider consequences. New high resolution paleoclimate records are revealing increasing complexity both within and between past abrupt climate events. Meanwhile, recent modelling studies have explored potential drivers other than freshwater, such as volcanic eruptions and ice sheet topography. This session invites contributions that address questions such as: What does it take to cause an abrupt climate event in a glacial or interglacial state? What differentiates Heinrich from non-Heinrich stadials? What caused the abrupt jumps in atmospheric CO2 and CH4 during stadials? What were the impacts of abrupt climate events on ocean and terrestrial carbon storage? We welcome proposals from all fields of the paleoclimate data and modelling community, including terrestrial, marine, and ice settings.
Primary Convener:  David J Thornalley, University College London, Dept. of Geography, London, United Kingdom; WHOI, Geology and Geophysics, Woods Hole, United States
Conveners:  Meredith A Kelly, Dartmouth College, Department of Earth Sciences, Hanover, United States, Shaun A Marcott, University of Wisconsin Madison, Department of Geoscience, Madison, United States and Feng He, University of Wisconsin-Madison, Center for Climatic Research, Madison, United States
Chairs:  David J Thornalley, University College London, Dept. of Geography, London, United Kingdom; WHOI, Geology and Geophysics, Woods Hole, United States, Feng He, University of Wisconsin-Madison, Center for Climatic Research, Madison, United States and Shaun A Marcott, University of Wisconsin Madison, Department of Geoscience, Madison, United States
OSPA Liaison:  David J Thornalley, University College London, Dept. of Geography, London, United Kingdom; WHOI, Geology and Geophysics, Woods Hole, United States
Index Terms:

1605 Abrupt/rapid climate change [GLOBAL CHANGE]
1616 Climate variability [GLOBAL CHANGE]
1620 Climate dynamics [GLOBAL CHANGE]
4901 Abrupt/rapid climate change [PALEOCEANOGRAPHY]

Abstracts Submitted to this Session:

Uniform summertime cooling across New Zealand during the Antarctic Cold Reversal (169879)
Shaun Eaves1, Andrew Mackintosh2, Brian Anderson3, Gisela Winckler4, Joerg M Schaefer5, Kevin P Norton2, Alice M Doughty6, Dougal Townsend7 and Stephen Tims8, (1)Antarctic Research Centre, Wellington, New Zealand, (2)Victoria University of Wellington, Wellington, New Zealand, (3)Victoria University of Wellington, Antarctic Research Centre, Wellington, New Zealand, (4)Lamont-Doherty Earth Observatory of Columbia University, Palisades, United States, (5)Columbia University of New York, Lamont-Doherty Earth Observatory, Palisades, NY, United States, (6)Dartmouth College, Hanover, NH, United States, (7)GNS Science, Lower Hutt, New Zealand, (8)Australian National University, Canberra, Australia
Inferring Past Climate in Equatorial East Africa using Glacier Models (179907)
Alice M Doughty, Dartmouth College, Hanover, NH, United States, Meredith A Kelly, Dartmouth College, Earth Sciences, Hanover, NH, United States, Brian Anderson, Victoria University of Wellington, Antarctic Research Centre, Wellington, New Zealand, James M Russell, Brown University, Department of Earth, Environmental, and Planetary Sciences, Providence, United States and Margaret S Jackson, Trinity College Dublin, Geography, Dublin, Ireland
Extensive glacier recession in both hemispheres during Heinrich Stadial 1? (Invited) (118119)
Aaron E Putnam, University of Maine, Earth and Climate Sciences, Orono, United States
Retreat of the Southwest Labrador Sector of the Laurentide Ice Sheet During the Last Termination (176788)
Meredith A Kelly, Dartmouth College, Earth Sciences, Hanover, NH, United States, Thomas V Lowell, University of Cincinnati, Department of Geosciences, Cincinnati, United States, Timothy G Fisher, University of Toledo, Toledo, OH, United States, Peter J. Barnett, Laurentian University, Sudbury, ON, Canada, Jennifer A Howley, Dartmouth College, Hanover, NH, United States and Susan R H Zimmerman, Lawrence Livermore National Laboratory, Center for Accelerator Mass Spectrometry, Livermore, United States
Micro-scale δ18O analyses of a Borneo stalagmite across the Toba super-eruption (185797)
Ian J Orland1,2, Kim M Cobb3, Stacy Carolin4, Ben Linzmeier2, John W Valley2 and Jess F Adkins5, (1)Georgia Institute of Technology Main Campus, Earth and Atmospheric Sciences, Atlanta, GA, United States, (2)University of Wisconsin Madison, WiscSIMS, Dept. of Geoscience, Madison, WI, United States, (3)Georgia Institute of Technology, Earth and Atmospheric Sciences, Atlanta, GA, United States, (4)University of Oxford, Earth Sciences, Oxford, United Kingdom, (5)California Institute of Technology, Pasadena, CA, United States
Spatiotemporal Patterns of Hydrological Changes During the Younger Dryas Onset from Decadally-Resolved Lacustrine Biomarker Records: a W-E European Transect (155933)
James Collins1, Bernhard Aichner2, Stefan Engels3, Christine Lane4,5, David Maas1,2, Ina Neugebauer6, Florian Ott7, Michal M. Slowinski7,8, Sabine Wulf7,9, Birgit Plessen7, Achim Brauer10 and Dirk Sachse2,11, (1)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 5.1: Geomorphology, Organic Surface Geochemistry Lab, Potsdam, Germany, (2)University of Potsdam, Institute of Earth and Environmental Sciences, Potsdam, Germany, (3)University of Nottingham, Centre for Environmental Geochemistry, School of Geography, Nottingham, United Kingdom, (4)University of Manchester, School of Environment, Education and Development, Manchester, United Kingdom, (5)University of Cambridge, Department of Geography, Cambridge, United Kingdom, (6)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 'Climate Dynamics and Landscape Evolution', Potsdam, Germany, (7)Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 5.2: Climate Dynamics and Landscape Evolution, Potsdam, Germany, (8)Polish Academy of Sciences, Department of Environmental Resources and Geohazards, Warszawa, Poland, (9)Heidelberg University, Heidelberg, Germany, (10)GFZ German Research Centre for Geosciences, Section 4.3 - Climate Dynamics and Landscape Evolution, Potsdam, Germany, (11)GFZ German Research Centre for Geosciences, Potsdam, Germany
Evaluating the flux of extraterrestrial osmium at the onset of Younger Dryas in the GRIP ice core (191527)
Ji-Hye Seo1, Changhee Han2, Sungmin Hong2, Joergen Peder Steffensen3 and Mukul Sharma4, (1)Dartmouth College, Hanover, United States, (2)Inha University, Ocean sciences, Incheon, South Korea, (3)Center for Ice and Climate, University of Copenhagen, Copenhagen, Denmark, (4)Green Golf Carbon, Miami, United States
Eastward routing of glacial Lake Agassiz runoff caused the Younger Dryas cold event (118943)
David Leydet1, Anders E Carlson2, James T Teller3, Andrew J. Breckenridge4, Dr. Aaron M Barth, PhD5, David J Ullman6, Gaylen Sinclair2, Glenn A. Milne7 and Marc W Caffee8, (1)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (2)Oregon State University, Corvallis, OR, United States, (3)University of Manitoba, Winnipeg, MB, Canada, (4)University of Wisconsin - Superior, Superior, WI, United States, (5)Oregon State University, Corvallis, United States, (6)Northland College, Ashland, WI, United States, (7)University of Ottawa, Department of Earth and Environmental Sciences, Ottawa, ON, Canada, (8)Purdue University, Department of Physics and Astronomy, West Lafayette, IN, United States

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