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	Quick Search Author Title Abstract Nr. Schedule Nr. Programme Groups Great Debates Union Symposia Educational Symposia Atmospheric Sciences Biogeosciences Climate: Past, Present, Future Cryospheric Sciences Energy, Resources and the Environment Geochemistry, Mineralogy, Petrology & Volcanology Geodesy Geodynamics Geomorphology Geophysical Instrumentation Hydrological Sciences Magnetism, Palaeomagnetism, Rock Physics & Geomaterials Natural Hazards Nonlinear Processes in Geophysics Ocean Sciences Planetary and Solar System Sciences Seismology Soil System Sciences Solar-Terrestrial Sciences Stratigraphy, Sedimentology and Palaeontology Tectonics and Structural Geology Medal Lectures Key Note Lectures Key Note Sessions Division Business Meetings Editorial Board Meetings Townhall Meetings Splinter Meetings Union Meetings   Information - CL023 Decadal to millennial marine records of ice sheet decay Event Information In recent years there has been intense research interest in the feedback relations between the North Atlantic meridional overturning circulation and freshwater inputs from surrounding glacial sources. Abrupt changes in the thermohaline circulation (THC) and/or rapid changes in sea ice distribution have been highlighted as the most plausible causes for rapid shifts in North Atlantic climates during the last glacial, notably the millennial-scale ‘Heinrich’ (H) events and Dansgaard-Oeschger (D-O) oscillations. The large ice sheets that surrounded the northern North Atlantic acted as major sinks for freshwater that, once released, interfered with thermohaline overturning thereby affecting the rate and amount of heat transports to high northern latitudes. However, despite intensive research into H layers and D-O ice-rafted detritus (IRD) cycles in the North Atlantic, there is still no clear consensus on the underlying mechanisms that caused these cyclic phenomena. Understanding the forcing and climatic feedbacks that propel these millennial-scale cycles is crucial for the development of predictive climate models. The key scientific rationale behind this session is to provide a focus for the discussion on the forcing and response sequences involved in natural variability of the ocean-ice-climate system. We encourage contributions reporting high-resolution marine records containing evidence for both ice sheet decay (IRD, meltwater signals) and hydrographic change (surface ocean temperature and salinity, 18O, planktonic foram assemblages; vertical water column structure, inter-species 18O gradients; deep water ventilation and flow intensity, benthic 13C, sortable silt). Though much recent work has focused on the North Atlantic, we encourage contributions on the ocean-ice-climate system from any part of the global ocean. We also particularly seek to establish closer links between the glacial/sedimentological and paleoceanographic communities, so welcome contributions on modern environments and processes in addition to paleostudies. Preliminary List of Solicited Speakers Details to follow shortly Co-Sponsorship Marine Studies Group of the Geological Society of London General Statement The information contained hereafter has been compiled and uploaded by the Session Organizers via the "Organizer Session Form". The Session Organizers have therefore the sole responsibility that this information is true and accurate at the date of publication, and the conference organizer cannot accept any legal responsibility for any errors or omissions that may be made, and he makes no warranty, expressed or implied, with regard to the material published. Back to Session Programme

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