On the hemispheric origins of meltwater pulse 1a |
| |
| Institution: | 1. NIOZ, Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry (MMB), and Utrecht University, PO Box 59, 1790 AB Den Burg, The Netherlands;2. Utrecht University, Faculty of Geosciences, Department of Earth Sciences, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;1. Department of Geography, Durham University, Lower Mountjoy, Durham DH1 3LE UK;2. TNO, Geological Survey of the Netherlands, Princetonlaan 6, P.O. Box 80015, 3508 TA Utrecht, The Netherlands;3. Department of Physical Geography, Faculty of Geosciences, Utrecht University, POBOX 800.115, 3508 TC Utrecht, The Netherlands;4. Environment Department, University of York, Heslington, York YO10 5DD, UK;5. Department of Geography, University of Northumbria, Ellison Place, Newcastle upon Tyne NE1 8ST UK;1. Leibniz-Institute for Baltic Sea Research Warnemünde (IOW), Marine Geology, Rostock, Germany;2. CEREGE, Aix-Marseille University, Collège de France, CNRS, IRD, Aix en Provence, France;3. Department of Palynology and Climate Dynamics, University of Göttingen, Germany;4. Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Germany;5. Isotope Geochemistry, Department of Earth Sciences, University of Tübingen, Germany;1. Geosciences Department, Williams College, 947 Main Street, Williamstown, MA 01267, USA;2. Ocean Sciences Department, University of California, 1156 High Street, Santa Cruz, CA 95064, USA;3. College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA;4. e4 Sciences, 27 Glen Road, Sandy Hook, CT 06482, USA;5. School for Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA;1. School of Ocean Sciences, Bangor University, Menai Bridge, Isle of Anglesey, LL59 5AB, UK;2. Institute of Marine and Atmospheric Research, Utrecht University, Princetonplein 5, 3584, CC Utrecht, The Netherlands;3. Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan;1. Geocoastal Research Group, School of Geosciences, University of Sydney, Sydney, NSW 2006, Australia;2. Atmosphere and Ocean Research Institute, University of Tokyo, Tokyo 113-0033, Japan;3. Department of Geological Sciences, University of Florida, Gainesville, FL 32611, United States;4. Department of Stratigraphy and Paleontology, University of Granada, Campus de Fuentenueva, 18002 Granada, Spain;5. Monterey Bay Aquarium Research Institute, Moss Landing, CA 95039, United States;6. NOAA National Centers for Coastal Ocean Science, Charleston, SC 29412, United States;7. Association for Marine Exploration, Honolulu, HI 96816, United States;8. Joint Institute for Marine and Atmospheric Research, University of Hawaii, Honolulu, HI 96822, United States |
| |
| Abstract: | During the glacial–interglacial transition that began subsequent to the Last Glacial Maximum approximately 21,000 calendar years ago, globally averaged (eustatic) sea-level rose by approximately 120 m as climate warmed to its current (Holocene) state. This rise of relative sea-level (RSL) did not occur smoothly, however, but was characterized by the occurrence of one or more episodes of extremely rapid increase. The most extreme of these events has come to be referred to as meltwater pulse 1a, and was initially identified in the coral based record of RSL history from the island of Barbados in the Caribbean Sea. Although it has usually been assumed that this episode of rapid RSL rise was derivative of a partial collapse of the northern hemisphere ice sheets, it has recently been suggested that this pulse could have originated in a dramatic melt-back of the Antarctic Ice Sheet. In this paper the arguments presented in favour of the southern hemisphere source are revisited in order to assess the plausibility of this alternative scenario.Based upon the analyses presented, it is concluded that the evidence previously provided in support of the southern hemisphere scenario is in fact unable to rule out an entirely northern hemisphere source for the meltwater pulse 1a. Since explicit evidence does exist that both the Laurentide and Fennoscandian ice sheets contributed to this event and that Antarctic ice sheet melting occurred significantly later, the southern hemisphere appears not to have been a prime mover of northern hemisphere events. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
