气候变化领域集成服务门户(CCPortal): A Late Miocene Terrestrial Temperature History for the Northeastern Tibetan Plateau's Period of Tectonic Expansion

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DOI	10.1029/2019GL082805
	A Late Miocene Terrestrial Temperature History for the Northeastern Tibetan Plateau's Period of Tectonic Expansion
	Chen, Chihao; Bai, Yan; Fang, Xiaomin; Guo, Haichao; Meng, Qingquan; Zhang, Weilin; Zhou, Pengchao; Murodov, Azamdzhon
通讯作者	Bai, Y (通讯作者)
发表日期	2019
ISSN	0094-8276
EISSN	1944-8007
起始页码	8375
结束页码	8386
卷号	46 期号:14
英文摘要	During the Late Miocene, the climate patterns and ecosystems of continental land masses experienced crucial transitions, but whether the principal driver was regional tectonic forcing or a decline in CO2 concentrations remains debated. Here we present a terrestrial paleotemperature record spanning similar to 12.7-5.2 Ma based on tetraether lipids extracted from the northeastern Tibetan Plateau. Our results reveal a sharp cooling (similar to 8 degrees C) during similar to 10.5-8 Ma, asynchronous with minor fluctuations in global sea temperatures, suggesting a rapid tectonic uplift of similar to 1 km in extent. This event appears consistent with the simultaneous aridification and transitions of ecosystems experienced in adjacent regions. Moreover, the amplitude of the cooling over land is less than that which occurred over the ocean during the CO2-dominated Late Miocene cooling event (similar to 7-5.4 Ma). We therefore concluded that tectonic forcing, rather than a decline in CO2 levels, most likely dominated continental climate patterns and ecosystem transitions during the Late Miocene. Plain Language Summary Animals and plants in many regions had to survive a gradual drying and cooling environment during the Late Miocene epoch (ca. 12-5 Ma). Exploring the drivers and mechanisms behind Late Miocene climate change is helpful when considering current global warming trends. Although the exact reason for these Late Miocene changes remains unclear, two suspects have been identified, that is, a decline in CO2 levels and/or regional tectonic activity. In this study we used microbial cell membrane lipid fossils to reconstruct the quantitative paleotemperatures and paleoaltitudes of the Xining Basin, on the northeastern Tibetan Plateau, during the Late Miocene. Our results revealed a surficial uplift event (similar to 10.5-8 Ma) delineated by the identification of a rapid cooling process during a period that experienced constant sea surface temperatures, leading to an increasingly dry climate and ecosystem changes over large areas. Moreover, the amplitude of this cooling over land appears to have been less than that observed over the ocean during the CO2-dominated Late Miocene cooling event (similar to 7-5.4 Ma). Therefore, we would posit that regional tectonic activities played a more important role than CO2 levels in the changes to terrestrial climate patterns and ecosystems during the Late Miocene.
关键词	DIALKYL GLYCEROL TETRAETHERS CARBON-DIOXIDE CONCENTRATIONS XINING BASIN BRANCHED TETRAETHERS SURFACE SEDIMENTS STABLE-ISOTOPES YENISEI RIVER QAIDAM BASIN LAKE QINGHAI RANGE GROWTH
英文关键词	paleotemperature; paleoaltitude; climate drivers; GDGTs; Tibetan Plateau; Late Miocene
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000481818900056
来源期刊	GEOPHYSICAL RESEARCH 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/259467
推荐引用方式 GB/T 7714	Chen, Chihao,Bai, Yan,Fang, Xiaomin,et al. A Late Miocene Terrestrial Temperature History for the Northeastern Tibetan Plateau's Period of Tectonic Expansion[J]. 中国科学院青藏高原研究所,2019,46(14).
APA	Chen, Chihao.,Bai, Yan.,Fang, Xiaomin.,Guo, Haichao.,Meng, Qingquan.,...&Murodov, Azamdzhon.(2019).A Late Miocene Terrestrial Temperature History for the Northeastern Tibetan Plateau's Period of Tectonic Expansion.GEOPHYSICAL RESEARCH LETTERS,46(14).
MLA	Chen, Chihao,et al."A Late Miocene Terrestrial Temperature History for the Northeastern Tibetan Plateau's Period of Tectonic Expansion".GEOPHYSICAL RESEARCH LETTERS 46.14(2019).