Tianxiao Wang, Duo Wu, Tao Wang, Lin Chen, Shilong Guo, Youmo Li, Chenbin Zhang
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In this study, based on the analysis of branched glycerol dialkyl glycerol tetraethers (brGDGTs) from a loess-paleosol sequence from the Ganjia Basin in the north-eastern Tibetan Plateau (NETP), we quantitatively reconstructed the mean annual air temperature (MAAT) over the past 12 ka. The MAAT reconstruction shows that the temperature remained low during the early Holocene (12–8 ka), followed by a rapid warming at around 8 ka. From 8 to 4 ka, the MAAT record reached its highest level, followed by a cooling trend from the late Holocene (4–0 ka). The variability of the reconstructed MAAT is consistent with trends of annual temperature records from the Tibetan Plateau (TP) during the Holocene. We attribute the relatively low temperatures during the early Holocene to the existence of ice sheets at high-latitude regions in the Northern Hemisphere and the weaker annual mean insolation at 35°N. During the mid to late Holocene, the long-term cooling trend in the annual temperature record was primarily driven by declining summer insolation. 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引用次数: 0
摘要
在全球变暖的背景下,重建全新世的气温演变对于了解目前的气温变化和预测未来的气候变化非常重要。由于代用资料重建与模型模拟之间的差异,全新世全球气温的演变仍存在争议,这一差异被称为 "全新世气温难题"。要解决现有记录的空间异质性问题,需要更可靠和定量的陆地温度记录。本研究基于对青藏高原东北部甘家盆地黄土-页岩序列中支链甘油二烷基甘油四醚(brGDGTs)的分析,定量重建了过去12 ka年的年平均气温(MAAT)。年平均气温重建结果表明,全新世早期(12-8 ka)气温较低,8 ka左右气温迅速升高。从 8 ka 到 4 ka,MAAT 记录达到最高水平,随后从全新世晚期(4-0 ka)开始出现降温趋势。重建的 MAAT 的变化与全新世青藏高原(TP)的年温度记录趋势一致。我们将全新世早期相对较低的温度归因于北半球高纬度地区冰盖的存在以及北纬35°地区较弱的年平均日照。在全新世中期至晚期,年气温记录中的长期降温趋势主要是由夏季日照减少造成的。这项研究为澄清全新世大洋洲的气温变化提供了关键的地质证据。
Holocene temperature variation recorded by branched glycerol dialkyl glycerol tetraethers in a loess-paleosol sequence from the north-eastern Tibetan Plateau
Reconstructing Holocene temperature evolution is important for understanding present temperature variations and for predicting future climate change, in the context of global warming. The evolution of Holocene global temperature remains disputed, due to differences between proxy reconstructions and model simulations, a discrepancy known as the ‘Holocene temperature conundrum’. More reliable and quantitative terrestrial temperature records are needed to resolve the spatial heterogeneity of existing records. In this study, based on the analysis of branched glycerol dialkyl glycerol tetraethers (brGDGTs) from a loess-paleosol sequence from the Ganjia Basin in the north-eastern Tibetan Plateau (NETP), we quantitatively reconstructed the mean annual air temperature (MAAT) over the past 12 ka. The MAAT reconstruction shows that the temperature remained low during the early Holocene (12–8 ka), followed by a rapid warming at around 8 ka. From 8 to 4 ka, the MAAT record reached its highest level, followed by a cooling trend from the late Holocene (4–0 ka). The variability of the reconstructed MAAT is consistent with trends of annual temperature records from the Tibetan Plateau (TP) during the Holocene. We attribute the relatively low temperatures during the early Holocene to the existence of ice sheets at high-latitude regions in the Northern Hemisphere and the weaker annual mean insolation at 35°N. During the mid to late Holocene, the long-term cooling trend in the annual temperature record was primarily driven by declining summer insolation. This study provides key geological evidence for clarifying Holocene temperature change in the TP.
期刊介绍:
Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities