DOI: 10.1016/j.gloplacha.2016.04.006
论文题名: Carbon and oxygen isotopic records from Lake Tuosu over the last 120 years in the Qaidam Basin, Northwestern China: The implications for paleoenvironmental reconstruction
作者: Li X. ; Zhou X. ; Liu W. ; Wang Z. ; He Y. ; Xu L.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 141 起始页码: 54
结束页码: 62
语种: 英语
英文关键词: Ostracoda
; Paleoenvironment
; Qaidam Basin
; Total organic carbon
; δ13C and δ18O
Scopus关键词: Animals
; Carbon
; Isotopes
; Lakes
; Meteorology
; Sedimentology
; Trees (mathematics)
; Depositional environment
; Environmental factors
; Environmental process
; Ostracoda
; Paleo-environment
; Paleoenvironmental reconstruction
; Qaidam basin
; Total Organic Carbon
; Organic carbon
; carbon isotope
; depositional environment
; geological record
; isotopic analysis
; isotopic composition
; lacustrine deposit
; micropaleontology
; ostracod
; oxygen isotope
; paleoclimate
; paleoenvironment
; paleohydrology
; precipitation assessment
; stable isotope
; total organic carbon
; China
; Qaidam Basin
; Qinghai
; Ostracoda
英文摘要: Isotopic compositions of total organic carbon (TOC) and authigenic carbonate in lakes have been widely used to reconstruct paleoclimatic changes and the depositional environments of lake sediments. However, since these proxies are often controlled by multiple environmental factors, detailed examinations of modern environmental processes is necessary before further applying them into paleoclimatic studies, especially in arid/semi-arid northwestern China. Here we generate High-resolution multi-proxy sedimentary records from Lake Tuosu, a hydrologically closed, saline and alkaline lake located at the north margin of the Qaidam Basin, through analysis of carbon isotope of TOC, and δ18O and δ13C values of ostracods over the last 120 years. Together with the meteorological data (precipitation and temperature), lake area record, and other tree-ring evidence, we examine how these sedimentary indices respond to changes in hydrologic balance and climate at interannual to decadal timescales. We found that sedimentary δ13Corg values resemble the variation of lake areas of Lake Tuosu over the last 40 years, suggesting that δ13Corg values would be an ideal indicator of lake area/level fluctuations and thus effective moisture variations (precipitation vs. evaporation). However, ostracod δ18O, which was previously used as proxies of effective precipitation, is not well correlated with δ13Corg values in Lake Tuosu. Therefore, the changes of ostracod δ18O values cannot be straightforwardly explained as the effective precipitation. Instead, the isotopic composition of carbonate would be additionally controlled by other factors including isotopic compositions of input water and drainage pattern. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964833569&doi=10.1016%2fj.gloplacha.2016.04.006&partnerID=40&md5=5785bc20869d0a5119298c6bfadd0f7e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11679
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Science, 710061, Xi'an, China
Recommended Citation:
Li X.,Zhou X.,Liu W.,et al. Carbon and oxygen isotopic records from Lake Tuosu over the last 120 years in the Qaidam Basin, Northwestern China: The implications for paleoenvironmental reconstruction[J]. Global and Planetary Change,2016-01-01,141.