An integrated biomarker perspective on Neogene-Quaternary climatic evolution in NE Tibetan Plateau: Implications for the Asian aridification
An integrated biomarker perspective on Neogene-Quaternary climatic evolution in NE Tibetan Plateau: Implications for the Asian aridification
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青藏高原东北部新近纪-第四纪气候演化的综合生物标志物视角：对亚洲干旱化的影响
DOI：
10.1016/j.quaint.2015.04.020
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发表时间：
2016
影响因子：
2.2
通讯作者：
Zhang Jun
中科院分区：
文献类型：
--
作者：
Peng Tingjiang;Li Jijun;Song Chunhui;Guo Benhong;Liu Jia;Zhao Zhijun;Zhang Jun
亚洲长期的古气候记录及其与全球气候记录的对比对于理解构造与气候的耦合机制具有重要意义。然而，使用生物标志物视角揭示的亚洲长期气候历史仍然难以捉摸。本文基于天水盆地生物标志物的综合记录及其周边地区的多个已发表资料，重建了青藏高原东北部新近纪-第四纪的气候历史。这些综合结果表明，青藏高原东北部直到1.4Ma才出现一致的干旱化趋势。在4 Ma以前，晚第三纪气候总体上是湿润的，但这一格局被2014.5 - 2012.5和2010 - 2016 Ma的两个干燥期暂时中断。这两个干燥期和永久干旱化趋势大致对应于青藏高原的一个全球性变冷和/或隆升事件，凸显了构造-气候相互作用的重要性和复杂性。然而，我们的研究表明，构造隆升对青藏高原东北部气候的影响，晚上新世以来越来越大。
The long-term paleoclimate record in Asia and its comparison with the global climate record are of vital importance to understanding the coupling mechanisms between tectonics and climate. However, such long-term climate history in Asia revealed using the biomarker perspective has remained elusive. Here, we reconstruct the Neogene–Quaternary climatic history of the Northeastern (NE) Tibetan Plateau based on the integrated biomarker records of the Tianshui Basin and multiple published data from its surrounding localities. These comprehensive results indicate that the NE Tibetan Plateau did not have a consistent aridity trend until ∼4 Ma. Before 4 Ma, the Neogene climate was generally humid although this pattern was temporarily interrupted by two drying intervals at ∼14.5–∼12.5 and ∼10–∼6 Ma. Each of the two drying intervals and the permanent aridification trend roughly correspond to one phase of global cooling and/or uplift event of the Tibetan Plateau, highlighting the importance and complexity of tectonic–climate interactions. However, our study indicates increasing influence of tectonic uplift on the NE Tibetan Plateau climate since late Pliocene.