Dominant Northern Hemisphere climate control over millennial-scale glacial sea-level variability |
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| Institution: | 1. GeoForschungsZentrum-Potsdam, Telegrafenberg, 14473 Potsdam, Germany;2. Potsdam-Institute for Climate Impact Research, Telegrafenberg, 14473 Potsdam, Germany;3. Research Center for Ocean Margins, University Bremen, Klagenfurter Strasse, 28359 Bremen, Germany;1. Department of Earth Sciences, University of New Hampshire, 56 College Rd., Durham, NH 03824, USA;2. Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA;3. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;4. Office of Research and Development, National Energy Technology Laboratory, Albany, OR 97321, USA;1. University of Bonn, Steinmann Institute, Germany;2. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, 97331, USA;1. ZMT – Leibniz Center for Tropical Marine Ecology, Bremen, Germany;2. MARUM – Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany;3. BGR – Federal Institute for Geosciences and Natural Resources, Hannover, Germany;4. AWI – Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany;1. Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Denmark;2. Department of Geography, College of Science, Swansea University, Wales, UK;3. Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland;4. Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland;5. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, USA;6. Laboratoire des Sciences du Climat et de l''Environnement, UMR CEA/CNRS/UVSQ, Gif sur Yvette, France;7. Scripps Institution of Oceanography, University of California, San Diego, USA;1. School of Resource and Environmental Management, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada;2. Bert Bolin Centre for Climate Research, Department of Geological Sciences, Stockholm University, 106 91 Stockholm, Sweden;3. British Antarctic Survey, Cambridge CB3 0ET, UK;4. School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK;5. Centre National de la Recherche Scientifique, CEA, Saclay 91191, France |
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| Abstract: | Based on a radiocarbon and paleomagnetically dated sediment record from the northern Red Sea and the exceptional sensitivity of the regional changes in the oxygen isotope composition of sea water to the sea-level-dependent water exchange with the Indian Ocean, we provide a new global sea-level reconstruction spanning the last glacial period. The sea-level record has been extracted from the temperature-corrected benthic stable oxygen isotopes using coral-based sea-level data as constraints for the sea-level/oxygen isotope relationship. Although, the general features of this millennial-scale sea-level records have strong similarities to the rather symmetric and gradual Southern Hemisphere climate patterns, we observe, in constrast to previous findings, pronounced sea level rises of up to 25 m to generally correspond with Northern Hemisphere warmings as recorded in Greenland ice-core interstadial intervals whereas sea-level lowstands mostly occur during cold phases. Corroborated by CLIMBER-2 model results, the close connection of millennial-scale sea-level changes to Northern Hemisphere temperature variations indicates a primary climatic control on the mass balance of the major Northern Hemisphere ice sheets and does not require a considerable Antarctic contribution. |
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