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DOI	10.1016/j.quascirev.2018.11.015
	Hydroclimate variability of northern Chilean Patagonia during the last 20 kyr inferred from the bulk organic geochemistry of Lago Castor sediments (45°S)
	Fiers G.; Bertrand S.; Van Daele M.; Granon E.; Reid B.; Vandoorne W.; De Batist M.
发表日期	2019
ISSN	0277-3791
起始页码	105
结束页码	118
卷号	204
英文摘要	Lago Castor (45°S) contains a continuous sediment record of Patagonian climate and environmental change during the last 20 kyr. Here, we use the bulk elemental and isotopic composition of the organic matter preserved in Lago Castor sediments to reconstruct changes in the supply of organic carbon of terrestrial and aquatic origin to the lake through time. Results show that the lake sedimentary organic matter is composed of variable proportions of lake plankton, terrestrial vegetation, and aquatic macrophytes. Before 17.8 cal kyr BP, aquatic macrophytes were abundant, likely due to the low but rising postglacial lake level. After 17.8 cal kyr BP, accumulation rates of organic carbon of aquatic macrophyte origin became negligible, whereas those of terrestrial origin increased, reflecting weak westerlies and terrestrial vegetation development under a milder climate, respectively. From 9.3 cal kyr BP onwards, accumulation rates of organic carbon from both aquatic macrophytes and terrestrial vegetation increased and peaked between 7.5 and 2.0 cal kyr BP. The latter is interpreted as a period of increased wind strength and precipitation, and is in excellent agreement with the grain-size results previously obtained on the same sediment core. All proxies show a secondary increase in wind strength and precipitation during the last millennium, in agreement with regional high-resolution records of the last 2000 years. These results, which are broadly compatible with regional pollen records during the Holocene, suggest that, at 45°S, the westerlies reached their maximum intensity between 7.5 and 2.0 cal kyr BP and increased again during the last millennium. © 2018 Elsevier Ltd
英文关键词	Bulk organic geochemistry; Chilean patagonia; Hydroclimate; Sedimentary organic matter; Southern westerlies
语种	英语
scopus关键词	Biogeochemistry; Biological materials; Climate change; Lakes; Sedimentology; Sediments; Vegetation; Hydroclimate; Organic geochemistry; Patagonia; Sedimentary organic matter; Southern westerlies; Organic carbon; environmental change; grain size; Holocene; hydrometeorology; isotopic composition; lacustrine deposit; lake level; macrophyte; organic compound; organic geochemistry; organic matter; paleoclimate; paleoenvironment; Postglacial; proxy climate record; reconstruction; sediment chemistry; sediment core; westerly; Chile; Patagonia
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152054
作者单位	Renard Centre of Marine Geology (RCMG), Department of Geology, Ghent University, Krijgslaan 281/S8, Ghent, Belgium; PProGRess/UGCT, Department of Geology, Ghent University, Krijgslaan 281/S8, Ghent, Belgium; Lille University of Science and Technology, Cité Scientifique, Villeneuve-d'Ascq, France; Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Moraleda 16, Coyhaique, Chile
推荐引用方式 GB/T 7714	Fiers G.,Bertrand S.,Van Daele M.,et al. Hydroclimate variability of northern Chilean Patagonia during the last 20 kyr inferred from the bulk organic geochemistry of Lago Castor sediments (45°S)[J],2019,204.
APA	Fiers G..,Bertrand S..,Van Daele M..,Granon E..,Reid B..,...&De Batist M..(2019).Hydroclimate variability of northern Chilean Patagonia during the last 20 kyr inferred from the bulk organic geochemistry of Lago Castor sediments (45°S).Quaternary Science Reviews,204.
MLA	Fiers G.,et al."Hydroclimate variability of northern Chilean Patagonia during the last 20 kyr inferred from the bulk organic geochemistry of Lago Castor sediments (45°S)".Quaternary Science Reviews 204(2019).