Post-glacial regional climate variability along the East Antarctic coastal margin-Evidence from shallow marine and coastal terrestrial records
| Autor: | Gareth J. Marshall, Bernd Wagner, Ines Tavernier, Mieke Sterken, Dominic A. Hodgson, E.V. de Vyver, Holger Cremer, John A. E. Gibson, Martin Melles, Stephen Roberts, Sergey Verkulich, Sakae Kudoh, Brenda L. Hall, Andrew McMinn, Koen Sabbe, Louise Newman, Steven D. Emslie, Elie Verleyen, Shiv Mohan Singh, Satoshi Imura, W. van Nieuwenhuyze, Wim Vyverman, Donna Roberts |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
reconstruction
Marine geology Earth & Environment Holocene climatic optimum Climate change deglaciation PG - Petroleum Geosciences Antarctic Peninsula Paleoclimatology paleoclimate Deglaciation Glacial period Paleolimnology Holocene Northern Hemisphere regional climate Last Glacial Maximum Medieval Warm Period East Antarctica climate variation Adelie Coast geological record sediment core West Antarctica Oceanography Warm period Little Ice Age General Earth and Planetary Sciences Antarctica Postglacial EELS - Earth Environmental and Life Sciences Geology Geosciences |
| Zdroj: | Earth-Science Reviews, 4, 104, 199-212 |
| Popis: | We review the post-glacial climate variability along the East Antarctic coastline using terrestrial and shallow marine geological records and compare these reconstructions with data from elsewhere. Nearly all East Antarctic records show a near-synchronous Early Holocene climate optimum (11.5-9 ka BP), coinciding with the deglaciation of currently ice-free regions and the optimum recorded in Antarctic ice and marine sediment cores. Shallow marine and coastal terrestrial climate anomalies appear to be out of phase after the Early Holocene warm period, and show complex regional patterns, but an overall trend of cooling in the terrestrial records. A Mid to Late Holocene warm period is present in many East Antarctic lake and shallow coastal marine records. Although there are some differences in the regional timing of this warm period, it typically occurs somewhere between 4.7 and 1 ka BP, which overlaps with a similar optimum found in Antarctic Peninsula terrestrial records. The differences in the timing of these sometimes abrupt warm events in different records and regions points to a number of mechanisms that we have yet to identify. Nearly all records show a neoglacial cooling from 2 ka BP onwards. There is no evidence along the East Antarctic coastline for an equivalent to the Northern Hemisphere Medieval Warm Period and there is only weak circumstantial evidence in a few places for a cool event crudely equivalent in time to the Northern Hemisphere's Little Ice Age. There is a need for well-dated, high resolution climate records in coastal East Antarctica and particularly in Terre Adelie, Dronning Maud Land and Enderby Land to fully understand the regional climate anomalies, the disparity between marine and terrestrial records, and to determine the significance of the heterogeneous temperature trends being measured in the Antarctic today. © 2010 Elsevier B.V. |
| Databáze: | OpenAIRE |
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