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Soil temperature and brGDGTs along an elevation gradient on the northeastern Tibetan Plateau: A test of soil brGDGTs as a proxy for paleoelevation

文献类型：期刊论文

作者Wang, Huanye1,2; Liu, Weiguo1,2,3
刊名CHEMICAL GEOLOGY
出版日期2021-04-05
卷号566页码:9
ISSN号0009-2541
关键词Tibetan Plateau brGDGTs Soil temperature Elevation Paleothermometer Paleoaltimeter
DOI10.1016/j.chemgeo.2021.120079
通讯作者Liu, Weiguo(liuwg@loess.llqg.ac.cn)
英文摘要The uplift history of the Tibetan Plateau is poorly constrained. A key problem is the discrepancy between reconstructions based on different paleoaltimeters. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) produced by soil-dwelling bacteria offer a potential tool for paleoaltimetry reconstruction. However, because insitu soil temperature-the direct link between brGDGTs and altitude-is generally not well-constrained, the reliability and uncertainty of this approach remain uncertain. Here, we investigated brGDGT distributions and in-situ soil temperature along an altitudinal gradient at 2300-4000 m on Mt. Laji, northeastern Tibetan Plateau, to test the relationships among altitude, temperature, and brGDGTs. The results show that: 1. the measured mean annual soil temperature (MAST) is strongly correlated with altitude (R-2 = 0.73), but compared with those for mean annual air temperature (MAAT) derived from weather stations, the absolute values are substantially higher particularly at higher altitudes, while the lapse rate (-0.39 degrees C/100 m) is much lower; 2. brGDGT-reconstructed MAST using published soil temperature calibrations is generally consistent with in-situ soil temperature measurements, displaying similar lapse rates (-0.48 degrees C/100 m for MAST(ST) and - 0.41 degrees C/100 m for MAST(STS) at the sunny slope) to that for measured MAST; 3. the slope aspect may affect both measured and brGDGT-reconstructed MAST by up to >3 degrees C. Overall, our results demonstrate that soil brGDGTs can quantitatively capture elevation-dependent soil temperature variation on the Tibetan Plateau. However, the use of ex-situ air temperature instead of in-situ soil temperature, and the effect of slope aspect on temperature, may introduce uncertainties in evaluating the brGDGT paleoaltimeter in this region. In paleo-applications, suitable calibrations are required and soil temperature lapse rates should be constrained before applying brGDGTs to quantitatively reconstruct past uplift histories.
资助项目Chinese Academy of Sciences[XDB40000000] ; Chinese Academy of Sciences[XDA2007020202] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program[2019QZKK0101] ; National Natural Science Foundation of China[41602183] ; West Light Foundation of the Chinese Academy of Sciences[XAB2019A03] ; Youth Innovation Promotion Association, CAS[2019403]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000628895300002
资助机构Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; National Natural Science Foundation of China ; West Light Foundation of the Chinese Academy of Sciences ; Youth Innovation Promotion Association, CAS
源URL[http://ir.ieecas.cn/handle/361006/16164]  
专题地球环境研究所_加速器质谱中心
第四纪科学与全球变化卓越创新中心
通讯作者Liu, Weiguo
作者单位1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
2.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Huanye,Liu, Weiguo. Soil temperature and brGDGTs along an elevation gradient on the northeastern Tibetan Plateau: A test of soil brGDGTs as a proxy for paleoelevation[J]. CHEMICAL GEOLOGY,2021,566:9.
APA Wang, Huanye,&Liu, Weiguo.(2021).Soil temperature and brGDGTs along an elevation gradient on the northeastern Tibetan Plateau: A test of soil brGDGTs as a proxy for paleoelevation.CHEMICAL GEOLOGY,566,9.
MLA Wang, Huanye,et al."Soil temperature and brGDGTs along an elevation gradient on the northeastern Tibetan Plateau: A test of soil brGDGTs as a proxy for paleoelevation".CHEMICAL GEOLOGY 566(2021):9.

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来源：地球环境研究所

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