Reconstruction of Climate Changes Based δ18Ocarb on the Northeastern Tibetan Plateau: A 16.1-cal kyr BP Record From Hurleg Lake

作者：Xueyun Ma, Zhifu Wei, Yongli Wang, Gen Wang, Ting Zhang, Wei He, Xiaoli Yu, He Ma, Pengyuan Zhang, Shangkun Li, Jingyi Wei, Qiaohui Fan · 发表于：Frontiers in Earth Science · 年份：2021 · DOI：10.3389/feart.2021.745972 · 被引用次数：13 · 研究领域：Geology and Paleoclimatology Research、Pleistocene-Era Hominins and Archaeology、Geological formations and processes

Hydroclimate evolution history and changes in the Tibetan Plateau play significant roles in depicting paleoclimate and evaluating climatic conditions in the coming future. However, the interaction of the westerlies and the Asian monsoon complicates our understanding of the mechanism of climate variation over the Tibetan Plateau. In this study, we assessed the paleoclimate of Hurleg Lake, which was previously located in the convergence area of the East Asian monsoon and westerly wind. We first reconstructed the climatic conditions based on fined-grained authigenic carbonate δ 18 O (δ 18 O carb ), plant-derived proxies of C/N, and n -alkane-derived δ 13 C 31 . In the Hurleg Lake, δ 18 O carb was controlled by δ 18 O changes of the lake water and evaporation. The climate evolution since ∼16.1 cal kyr BP can be classified into three stages. The Lateglacial (16.1–11.0 cal kyr BP) was characterized by a warm-wet climate in the beginning, followed by a cold-dry climate since 12.0 cal kyr BP. Typical warm and cold phases occurred during 14.8–12.0 cal kyr BP and 12.0–11.1 cal kyr BP, which may correspond to the Bølling/Allerød (B/A) and Younger Dryas periods, respectively. The early to mid-Holocene was generally characterized by a warm-wet climate; however, notable cold-dry intervals occurred at ∼8.3 cal kyr BP. The Late Holocene (after 4.8 cal kyr BP) displayed a significantly cold-wet climate. Finally, we examined the possible mechanisms responsible for the climate variability in th...