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| DOI | 10.1016/j.epsl.2023.118040 |
| Limits of oxygen isotope palaeoaltimetry in Tibet | |
| Farnsworth, Alex; Valdes, Paul J.; Ding, Lin; Spicer, Robert A.; Li, Shi-Hu; Su, Tao; Li, Shufeng; Witkowski, Caitlyn R.; Xiong, Zhongyu | |
| 发表日期 | 2023 |
| ISSN | 0012-821X |
| EISSN | 1385-013X |
| 卷号 | 606 |
| 英文摘要 | Measurements of stable water isotopes (oxygen and hydrogen) are commonly used to estimate palaeoelevation and quantify past changes in surface height across Tibet. Isotope palaeoaltimetry is often based on simple Rayleigh fractionation of a parcel of air, but must make a considerable number of approximations and assumptions. In this paper, we elaborate on the practicability of oxygen water isotopes in palaeoaltimetry, and evaluate a recent challenge to the palaeoaltimetry community. First, we examine the isotopic composition of oxygen (delta 18O) versus altitude relationship in a set of five topographic realisations of Tibet using an isotope-enabled palaeoclimate model for the mid-Eocene, a period where a variety of topographic 'uplift' models have been proposed, and compare it to modern relationships. Second, we investigate whether isotopic composition is a good predictor of more modest changes in topography, such as the introduction of a valley system or uplift of only part of the Tibetan region. The aim of the paper is not to perform a direct comparison to data, but to use the model to further refine knowledge of the strengths and limitations of using oxygen isotopes in palaeoaltimetry. We find that oxygen isotope palaeoaltimetry works surprisingly well, with the exception that it could not identify low elevation valley systems bounded by high elevations because the isotopic composition of the water in the air becomes depleted at the first high elevation that an air parcel passes over and does not recover when it descends into the valley. Hence, isotope-based elevations are biased towards mountain range peaks. Overall, the application of oxygen isotope palaeoaltimetry does have value, but would be further strengthened when employed together with isotope-enabled models. In conjunction with other techniques such as terrestrial thermal lapse rates and energy conservation approaches, over a wide spatial region, a more accurate and fully three-dimension view of complex palaeo-topography is increasingly possible, which will in turn improve the precision of these palaeoaltimeters.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). |
| 关键词 | palaeoclimatepalaeoaltimetryTibetisotopemodellingEocene |
| 英文关键词 | STABLE-ISOTOPES; PRECIPITATION; CLIMATE; PALEOELEVATION; PALEOALTIMETRY; EOCENE; ASIA; EVOLUTION; ELEVATION; PLATEAU |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000953153200001 |
| 来源期刊 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/282573 |
| 作者单位 | Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; University of Bristol; University of Bristol; Chinese Academy of Sciences; Xishuangbanna Tropical Botanical Garden, CAS; Open University - UK; Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; University of Bristol |
| 推荐引用方式 GB/T 7714 | Farnsworth, Alex,Valdes, Paul J.,Ding, Lin,et al. Limits of oxygen isotope palaeoaltimetry in Tibet[J]. 中国科学院青藏高原研究所,2023,606. |
| APA | Farnsworth, Alex.,Valdes, Paul J..,Ding, Lin.,Spicer, Robert A..,Li, Shi-Hu.,...&Xiong, Zhongyu.(2023).Limits of oxygen isotope palaeoaltimetry in Tibet.EARTH AND PLANETARY SCIENCE LETTERS,606. |
| MLA | Farnsworth, Alex,et al."Limits of oxygen isotope palaeoaltimetry in Tibet".EARTH AND PLANETARY SCIENCE LETTERS 606(2023). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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