A 17,900-year multi-proxy lacustrine record of Lago Puyehue (Chilean Lake District): introduction
A 17,900-year multi-proxy lacustrine record of Lago Puyehue (Chilean Lake District): introduction
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Lago Puyehue（智利湖区）17,900 年多代理湖相记录：简介
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
E. Chapron
中科院分区：
文献类型：
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作者：
M. Batist;N. Fagel;M. Loutre;E. Chapron
本文介绍了一个研究项目的背景和主要结果，该项目旨在通过对普耶韦湖（Lago Puyehue）（南纬40°，智利湖区）自末次盛冰期（LGM）以来的古湖泊学和古气候学历史进行研究，该项目基于对湖泊中的几个沉积物岩芯的研究以及在湖泊流域的广泛实地考察。最长的记录是在11米长的活塞芯中获得的。通过 AMS 14C 测年、210Pb 和 237Cs 测量、事件沉积物识别以及过去 600 年的生物计数，建立了年龄深度模型。核心延伸至 17,915 cal。年。英国石油公司和地震数据表明，在此之前几千年就已经存在开放湖沉积环境。岩心接受了多代理分析，包括沉积学、矿物学、粒度、主要地球化学和有机地球化学（C/N 比、δ13C）、烧失量、磁化率、硅藻分析和孢粉学。沿岩芯沉积物成分的变化表明，自末次盛冰期以来，普耶韦湖地区的特点是一系列快速的气候波动叠加在长期变暖趋势上。已确定的气候波动证实了 a.o.晚冰期寒冷逆转的存在比北半球新仙女木寒冷期早 500-1,000 年，以及南半球全新世早期气候最适宜的存在。过去 600 年的变化厚度分析揭示了与厄尔尼诺南方涛动和太平洋十年涛动相关的周期性，以及降水量增加的间隔，与南半球相当于小冰河时期厄尔尼诺影响的加剧有关。
This paper introduces the background and main results of a research project aimed at unravelling the paleolimnological and paleoclimatological history of Lago Puyehue (40° S, Lake District, Chile) since the Last Glacial Maximum (LGM), based on the study of several sediment cores from the lake and on extensive fieldwork in the lake catchment. The longest record was obtained in an 11-m-long piston core. An age-depth model was established by AMS 14C dating, 210Pb and 237Cs measurements, identification of event-deposits, and varve-counting for the past 600 years. The core extends back to 17,915 cal. yr. BP, and the seismic data indicate that an open-lake sedimentary environment already existed several thousands of years before that. The core was submitted to a multi-proxy analysis, including sedimentology, mineralogy, grain-size, major geochemistry and organic geochemistry (C/N ratio, δ13C), loss-on-ignition, magnetic susceptibility, diatom analysis and palynology. Along-core variations in sediment composition reveal that the area of Lago Puyehue was characterized since the LGM by a series of rapid climate fluctuations superimposed on a long-term warming trend. Identified climate fluctuations confirm a.o. the existence of a Late-Glacial cold reversal predating the northern-hemisphere Younger Dryas cold period by 500–1,000 years, as well as the existence of an early southern-hemisphere Holocene climatic optimum. Varve-thickness analyses over the past 600 years reveal periodicities similar to those associated with the El Niño Southern Oscillation and the Pacific Decadal Oscillation, as well as intervals with increased precipitation, related to an intensification of the El Niño impact during the southern-hemisphere equivalent of the Little Ice Age.
影响因子：
56.9
作者：
Lamy, F;Kaiser, J;Stoner, J
通讯作者：
Stoner, J