Hydrogen isotopic compositions of long-chain leaf wax n-alkanes in Lake Qinghai sediments record palaeohydrological variations during the past 12 ka
文献类型：期刊论文
| 作者 | Wang, Zheng2; An, Zhisheng2; Liu, Weiguo2; Liu, Hu1,2; Cao, Yunning2 |
| 刊名 | QUATERNARY INTERNATIONAL
 |
| 出版日期 | 2017-08-20 |
| 卷号 | 449期号:2017页码:67-74 |
| 关键词 | N-alkane Hydrogen Isotope Lake Qinghai The Holocene |
| DOI | 10.1016/j.quaint.2017.05.024 |
| 文献子类 | Article |
| 英文摘要 | Lake Qinghai, the largest saltwater lake in China, is located on the northeastern Qinghai-Tibetan Plateau. The lake sediments record the climatic variation and response to global climate change on the plateau. Numerous studies of the lake have been conducted, but various opinions remain regarding the palaeoclimatic conditions for the lake since the Last Glacial Maximum, especially the palaeohydrological conditions for the northeastern plateau in the early Holocene. Here, we discuss the hydrogen isotopic composition (delta D) of long-chain leaf wax n-alkanes for studying the hydrological changes in the lake since the Holocene. The results show that, on the northeastern Qinghai-Tibetan Plateau, C-31 delta D values were quite negative (avg. -202 +/- 4%) in the early Holocene (8-12 ka), indicating a strong monsoon and greater precipitation during that period. During 8-4 ka, C-31 delta D values gradually became more positive, indicating that the monsoon gradually weakened and precipitation gradually decreased. The C31 dD values were more positive in the late Holocene, with a mean value of -186 +/- 3%, showing that the regional monsoon weakened and the amount of precipitation was low. In addition, C-31 dD values indicated large amounts of precipitation in the early Holocene, but the C-29 delta D values during the same period were significantly more positive than C-31 due to a large contribution from aquatic plants. Therefore, the water level of the lake was low in this period, which could be related to strong evaporation of the lake water because of the high temperature in the early Holocene. Our study clarifies the changes in the monsoon and precipitation in the northeastern Qinghai-Tibetan Plateau and it provides a new estimate of the water level variation in Lake Qinghai in the early Holocene. (C) 2017 Elsevier Ltd and INQUA. All rights reserved. |
| WOS关键词 | NORTHEASTERN TIBETAN PLATEAU ; RATIO MASS-SPECTROMETRY ; TERRESTRIAL PLANTS ; SUMMER MONSOON ; HYDROLOGICAL CHANGES ; HOLOCENE MOISTURE ; SURROUNDING AREA ; SUBMERGED PLANTS ; CARBON ISOTOPES ; OXYGEN-ISOTOPE |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000409351800006 |
| 源URL | [http://ir.ieecas.cn/handle/361006/5399]  |
| 专题 | 地球环境研究所_加速器质谱中心 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Zheng,An, Zhisheng,Liu, Weiguo,et al. Hydrogen isotopic compositions of long-chain leaf wax n-alkanes in Lake Qinghai sediments record palaeohydrological variations during the past 12 ka[J]. QUATERNARY INTERNATIONAL,2017,449(2017):67-74. |
| APA | Wang, Zheng,An, Zhisheng,Liu, Weiguo,Liu, Hu,&Cao, Yunning.(2017).Hydrogen isotopic compositions of long-chain leaf wax n-alkanes in Lake Qinghai sediments record palaeohydrological variations during the past 12 ka.QUATERNARY INTERNATIONAL,449(2017),67-74. |
| MLA | Wang, Zheng,et al."Hydrogen isotopic compositions of long-chain leaf wax n-alkanes in Lake Qinghai sediments record palaeohydrological variations during the past 12 ka".QUATERNARY INTERNATIONAL 449.2017(2017):67-74. |
入库方式： OAI收割
来源：地球环境研究所
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