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Temperature Variation on the Central Tibetan Plateau Revealed by Glycerol Dialkyl Glycerol Tetraethers From the Sediment Record of Lake Linggo Co Since the Last Deglaciation
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2020-08-17 , DOI: 10.3389/feart.2020.574206
Yue He , Juzhi Hou , Mingda Wang , Xiumei Li , Jie Liang , Shuyun Xie , Yurong Jin

The Tibetan Plateau (TP) has numerous glaciers that provide water for more than one-third of the world’s population. Reconstructing past temperature change on the TP provides a valuable context for assessing the current and possible future status of glaciers. However, the quantitative paleotemperature records since the last deglaciation on the TP are sparse. Moreover, existing records have revealed a conflicting Holocene temperature variation patterns on the northeastern and western TP. Quantitative temperature records on the central TP would be essential for a better understanding of the spatiotemporal complexity of temperature variation. In this study, we report the temperature record from the sedimentary record of lake Linggo Co on the central TP since the last deglaciation using branched glycerol dialkyl glycerol tetraethers based proxy. Our results indicate that the paleoclimate during the last deglaciation on the central TP was characterized by large fluctuations in temperature. The mean annual temperature of lake Linggo Co remained low during the early Holocene (11.7–10 ka BP) and gradually increased to 4°C at 8.3 ka, rapidly declining to −2°C on average toward the present day. Solar radiation, continental glacier feedback, as well as atmosphere circulation play a major role in the distribution of sensitive and latent heat, thus affecting the Holocene temperature variability of the TP. Discrepancies in published records on the TP can result from a seasonal bias of the proxies and spatial differences due to topography-boundary effect. Our results suggest that the seasonal bias of proxies, the spatiotemporal difference should be taken into consideration before regional or global synthesis of paleotemperature records.



中文翻译:

上次冰期以来Linggo湖沉积记录中甘油二烷基甘油四醚所显示的青藏高原中部温度变化

青藏高原(TP)有众多冰川,为世界三分之一以上的人口提供水。在TP上重建过去的温度变化,为评估冰川的当前和未来可能的状态提供了有价值的背景。然而,自TP上最后一次冰消以来的定量古温度记录很少。此外,现有记录显示东北和西部TP的全新世温度变化模式相互矛盾。中央TP上的定量温度记录对于更好地理解温度变化的时空复杂性至关重要。在这项研究中,我们报告了自上次使用分支支链甘油二烷基甘油四醚类代用品进行脱冰以来,Linggo Co在中央TP上的沉积记录的温度记录。我们的结果表明,在中央TP的最后一次冰消作用期间的古气候以温度的大波动为特征。在全新世早期(11.7-10 ka BP),Linggo Co湖的年平均温度仍然很低,并在8.3 ka时逐渐升高到4°C,到今天平均平均迅速下降到-2°C。太阳辐射,大陆冰川反馈以及大气环流在敏感和潜热的分布中起着重要作用,从而影响了TP的全新世温度变化。TP上已发布记录中的差异可能是由于代理的季节性偏差以及由于地形边界效应导致的空间差异所致。我们的结果表明,代理的季节性偏差,

更新日期:2020-09-02
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