globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2015.05.010
Scopus记录号: 2-s2.0-84934955812
论文题名:
The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49°S) situated within the Southern Hemisphere westerly belt
作者: Van der Putten N.; Verbruggen C.; Björck S.; Michel E.; Disnar J.-R.; Chapron E.; Moine B.N.; de Beaulieu J.-L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 122
起始页码: 142
结束页码: 157
语种: 英语
英文关键词: Indian ocean ; Kerguelen islands ; Last termination ; Oceanic cold reversal ; Palaeoclimatology ; Peat record ; Southern hemisphere westerly belt ; Southern ocean
Scopus关键词: Atmospheric humidity ; Climatology ; Deposits ; Domes ; Earth (planet) ; Lakes ; Magnetic susceptibility ; Meteorology ; Ocean currents ; Peat ; Plants (botany) ; Indian ocean ; Kerguelen islands ; Last termination ; Oceanic cold reversal ; Palaeoclimatology ; Southern Hemisphere ; Southern ocean ; Oceanography ; Antarctic Circumpolar Wave ; atmospheric circulation ; belt ; carbon dioxide ; deglaciation ; deuterium ; geoaccumulation ; geochronology ; global warming ; Holocene ; ice core ; lacustrine deposit ; Last Glacial Maximum ; moisture content ; paleoclimate ; proxy climate record ; reconstruction ; Southern Hemisphere ; terrestrial environment ; upwelling ; ventilation ; French Southern Territories ; Indian Ocean ; Indian Ocean (South) ; Kerguelen Islands ; New Zealand ; South America
英文摘要: The awareness of the significance of the Southern Ocean in the Earth's climate system has become increasingly obvious. The deglacial atmospheric CO2 rise during warming periods in Antarctica has been attributed to CO2 ventilation from the deep ocean caused by enhanced upwelling around the Antarctic Divergence. It has been hypothesized that, more intense Southern Hemisphere westerly winds aligned with the Antarctic Circumpolar Current due to a southward shift of the wind belt from its Last Glacial Maximum equator-ward position, are the main drivers. Reconstructions of past changes in atmospheric circulation in the Southern Hemisphere are still scarce and the overall picture is patchy with sometimes contradictory results. For obvious reasons, most terrestrial records originate from southern South America and New Zealand. Here we present a terrestrial record from the Indian sector of the Southern Ocean, from Kerguelen Islands located at 49°S. A peat record is investigated using a multi-proxy approach (pollen and plant macrofossils, magnetic susceptibility, XRF analyses, biogenic silica content, Rock-Eval6 analysis and humification degree). Peat accumulation starts at about 16,000calyr BP with relatively warm and dry conditions. The most prominent change in our proxy data occurs at 13,600calyr BP, when peat ponds were established on the peat surface, resulting in lacustrine-type deposits, as a result of very high humidity, and with proxies implying very windy conditions. Within chronological uncertainties, this onset coincides with the onset of the so-called Oceanic Cold Reversal, based on the deuterium excess data in the EPICA Dome C ice core record. Kerguelen Islands are located in the moisture source area of Dome C and a change in atmospheric circulation at that time could explain both records. Around 12,900calyr BP, at the end of the Antarctic Cold Reversal, pond/lake sediments give way to more peaty deposits, with proxies suggesting slightly drier, less windy and probably warmer conditions. Kerguelen Islands became less influenced by the Southern Hemisphere westerly winds and these conditions were amplified during the early Holocene climate optimum as found in Antarctic ice core records. © 2015 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59876
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geology, Quaternary Sciences, Lund University, Sölvegatan 12, Lund, Sweden; Department of Geology and Soil Science, Ghent University, Krijgslaan 281 (S8), Gent, Belgium; Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Laboratoire mixte CNRS-CEA-UVSQ, Avenue de la Terrasse, Gif-sur-Yvette Cedex, France; Institut des Sciences des la Terre d'Orléans, ISTO, UMR 7327, CNRS, Univ Orléans, BRGM, 1A rue de la Férollerie, Orléans Cedex 2, France; Universités de Lyon, Université Jean Monnet, Laboratoire Magmas et Volcans UMR-CNRS 6524, Saint-Etienne, France; IMBE-UMR CNRS 7263/IRD/Aix-Marseille Université 237, Europôle Méditerranéen de l'Arbois, BP 80, Aix-en-Provence Cedex 04, France; GEODE, UMR5602, Université Toulouse 2 Jean Jaures, Maison de la recherche, 5 allée Antonio Machado, Toulouse Cedex 1, France

Recommended Citation:
Van der Putten N.,Verbruggen C.,Björck S.,et al. The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49°S) situated within the Southern Hemisphere westerly belt[J]. Quaternary Science Reviews,2015-01-01,122
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