Glacial/interglacial sea surface temperature changes in the Southwest Pacific ocean over the past 360 ka |
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| Authors: | Kazuyo Tachikawa Laurence Vidal Corinne Sonzogni Edouard Bard |
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| Institution: | 1. School of Earth, Environment and Biological Sciences, Queensland University of Technology, Gardens Point, Queensland 4000, Australia;2. School of Geography, Planning and Environmental Management, The University of Queensland, St Lucia, Queensland 4072, Australia;3. National Institute of Water and Atmosphere, Wellington, New Zealand;4. School of Earth & Environmental Sciences (SEES), The University of Wollongong, New South Wales 2522, Australia;5. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany;6. School of Geography, Environment and Population, The University of Adelaide, South Australia 5005, Australia;7. Archaeology and Natural History, The Australian National University, Australia;8. Institute of Ecology and Biodiversity, University of Chile, Santiago, Chile;9. School of Science, Information Technology & Engineering, The University of Ballarat, Ballarat, Victoria 3353, Australia;10. School of Biological, Earth & Environmental Sciences, University of New South Wales, Australia;11. College of Life & Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK;12. School of the Built and Natural Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK;13. Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden;1. Centre for Environmental Management, School of Science, Information Technology and Engineering, University of Ballarat, Australia;2. Geography, College of Life and Environmental Sciences, University of Exeter, United Kingdom;3. GeoQuEST Research Centre, School of Earth & Environmental Sciences, The University of Wollongong, New South Wales, Australia;4. School of Environmental and Life Sciences, University of Newcastle, New South Wales, Australia;5. National Institute of Water and Atmospheric Research, Wellington, New Zealand;6. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany;7. Department of Physical Geography and Quaternary Geology, Stockholm University, Sweden;8. Australian Rivers Institute, Griffith University, Queensland, Australia;9. Research School of Earth Sciences, The Australian National University, Canberra, Australia;10. School of Earth, Environment and Biological Sciences, Queensland University of Technology, Gardens Point, Queensland, Australia;11. Climate Change Research Centre, University of New South Wales, Sydney, Australia;12. ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, Australia;1. 15 Summerleas Road, Fern Tree, Tasmania 7054, Australia;2. Australian Nuclear Science and Technology Organisation, Menai 2234, NSW, Australia;1. Centre for Environmental Management, School of Science, Information Technology and Engineering, University of Ballarat, Ballarat, VIC 3353, Australia;2. National Institute of Water and Atmospheric Research, Wellington, New Zealand;3. Research School of Earth Sciences, The Australian National University, Canberra, Australia;4. Geography, College of Life and Environmental Sciences, University of Exeter, United Kingdom;5. School of Earth and Environmental Sciences, University of Wollongong, Australia;6. Antarctic Research Centre, Victoria University of Wellington, New Zealand;7. Department of Resource Management and Geography, The University of Melbourne, Australia;8. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany;9. Department of Environmental Science, William Patterson University, Wayne, NJ, USA;10. School of Culture, History and Language, The Australian National University, Canberra, Australia;11. Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden;12. Catchment to Reef Research Group, TropWATER, James Cook University, Townsville, Australia;13. School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia;14. Climate Research Group, School of Geography, Planning and Environmental Management, The University of Queensland, Brisbane, Australia;15. Centre for Palynology and Palaeoecology, Department of Geography and Environmental Science, Monash University, Australia;p. Cluster Earth & Climate, Department of Earth Sciences, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;1. Australian Rivers Institute, Nathan Campus, Griffith University, 170 Kessels Road, Nathan, QLD 4111, Australia;2. School of Earth and Environmental Sciences, University of Wollongong, NSW 2522, Australia;1. Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany;2. MARUM – Zentrum für Marine Umweltwissenschaften der Universität Bremen, Bremen, Germany |
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| Abstract: | The phase relationship between climate parameters during terminations gives insight into deglaciation mechanisms. By combining foraminiferal Mg/Ca and alkenone thermometers with planktonic and benthic foraminiferal δ18O, we determined the phase relationship between local sea surface temperature (SST) and global seawater δ18O changes in the Coral Sea in the Southwestern Pacific over the last 360 ka. The onset of the SST warming preceded the seawater δ18O change by several ka for Termination I, II and III. During Termination I, the SST warming started at 20 ka BP, earlier than atmospheric CO2 rise suggesting that the greenhouse effect was not the main trigger of this early warming. Compilation of 14C-dated SST records from the whole Pacific during Termination I reveals that the onset of the warming is generally earlier in the Southern and the tropical Pacific than in the North Pacific. This spatio-temporal warming pattern suggests linkage between the southern ocean and tropical Pacific. The early tropical warming could provide heat and moisture to the northern high latitudes, modifying radiative balance and precipitation over ice sheets at the onset of deglaciation. |
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