DOI: 10.1016/j.quascirev.2018.11.015
Scopus记录号: 2-s2.0-85057605068
论文题名: Hydroclimate variability of northern Chilean Patagonia during the last 20 kyr inferred from the bulk organic geochemistry of Lago Castor sediments (45°S)
作者: Fiers G. ; Bertrand S. ; Van Daele M. ; Granon E. ; Reid B. ; Vandoorne W. ; De Batist M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 204 起始页码: 105
结束页码: 118
语种: 英语
英文关键词: Bulk organic geochemistry
; Chilean patagonia
; Hydroclimate
; Sedimentary organic matter
; Southern westerlies
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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117416
Appears in Collections: 气候变化与战略
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Recommended Citation:
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]. Quaternary Science Reviews,2019-01-01,204