DOI: 10.1016/j.palaeo.2015.06.014
论文题名: Reconstruction of a paleotemperature record from 0.3-3.7ka for subtropical South China using lacustrine branched GDGTs from Huguangyan Maar
作者: Hu J. ; Zhou H. ; Peng P. ; Yang X. ; Spiro B. ; Jia G. ; Wei G. ; Ouyang T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 435 起始页码: 167
结束页码: 176
语种: 英语
英文关键词: CBT
; China
; GDGTs
; Maar lake
; MBT
; Paleoclimate
英文摘要: The concentrations of glycerol dialkyl glycerol tetraethers (GDGTs) in catchment soils, suspended particulate matter (SPM), lake bottom sediments, and sediment cores from Huguangyan Maar, subtropical South China, were investigated. The distribution of isoprenoid GDGTs has GDGT-0/crenachaol>2 and therefore the widely used TEX86 is precluded from being used for the calculation of lake water temperature in this lake. The total concentration of branched GDGTs (br-GDGTs) in the soils, SPM, and lake bottom sediments ranged from 91.3-223.7ng/g, 17.8-41.4ng/L, and 864.2-2008.6ng/g, respectively. The molecular composition of br-GDGTs, MBT values (methylation of br-GDGTs), and CBT values (the cyclization ratio of br-GDGTs) in the catchment soils differ from those in lake materials. This difference indicates that br-GDGTs in the lake are largely produced in situ. Based on the global lake-specific MBT/CBT-MAT (mean air temperature) calibration, the air temperature was reconstructed for lacustrine material in Huguangyan Maar. The estimates fall in the range 23.2-23.8°C, similar to the average value of local MAT for the preceding 45years. The paleotemperature history of Huguangyan Maar was reconstructed using br-GDGTs extracted from a sediment core spanning the period 0.3-3.7ka, and ranged from 24.6 to 26.3°C. The temperature pattern of Huguangyan Maar based on the global lake-specific MBT/CBT-MAT resembles those recorded in East China using numerous indicators. The pattern consists of five cool and four warm periods, including two distinct phases within the Medieval Warm Period (900-1300AD), the coldest temperature in the Little Ice Age (1550-1850AD) and reveals even finer temperature variations than other indicators. This new method based on br-GDGTs, produced in situ in the subtropical lacustrine environment, provides a new sensitive and precise paleotemperature proxy for lacustrine sediments for which other GDGT-based proxies are not applicable. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68866
Appears in Collections: 过去全球变化的重建
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作者单位: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; CAS Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China; Department of Earth Sciences, Sun Yat-Sen University, Guangzhou, China; Department of Mineralogy, The Natural History Museum, Cromwell Road, London, United Kingdom
Recommended Citation:
Hu J.,Zhou H.,Peng P.,et al. Reconstruction of a paleotemperature record from 0.3-3.7ka for subtropical South China using lacustrine branched GDGTs from Huguangyan Maar[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,435