Decadal- to centennial-scale climate changes over the last 2000 yr recorded from varved sediments of Lake Kusai, northern Qinghai-Tibetan Plateau
Decadal- to centennial-scale climate changes over the last 2000 yr recorded from varved sediments of Lake Kusai, northern Qinghai-Tibetan Plateau
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DOI：
10.1017/qua.2019.19
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发表时间：
2019-09
影响因子：
2.3
通讯作者：
Weihan Jia;Xingqi Liu
中科院分区：
文献类型：
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作者：
Weihan Jia;Xingqi Liu
摘要 全新世晚期的高分辨率气候档案对于古气候动力学研究以及了解自然和人为影响对过去和未来气候变化的重要性至关重要。在这里，我们展示了从库西湖的变化沉积岩芯中检索到的日期明确的 X 射线荧光扫描记录。这些记录显示了过去2000年青藏高原北部十年至百年尺度的古气候变化。 Ca主要与自生碳酸盐的沉淀有关，是温度变化的代表。库西湖的Ca记录与太阳活动的变化和周期性有很好的相关性。因此，太阳能输出可以被认为是过去 2000 年十年至百年尺度温度波动的主要强迫机制。根据Rb/Sr对数比推断有效水分的演变，与东阁洞典型的印度夏季风记录同步变化。这些结果表明，青藏高原北部十年至百年尺度的有效水汽演化主要受印度夏季风的影响。此外，我们在过去 2000 年的有效湿度记录中没有发现太阳活动的明显周期性。
Abstract High-resolution climate archives of the Late Holocene are essential in the study of paleoclimatic dynamics and for understanding the importance of natural and anthropogenic influences on past and future climate changes. Here, we present well-dated X-ray fluorescence scanning records retrieved from a varved sediment core from Lake Kusai. These records show the decadal- to centennial-scale paleoclimatic variability of the northern Qinghai-Tibetan Plateau over the last 2000 yr. Ca is mainly related to the precipitation of authigenic carbonates and is a proxy for temperature changes. The Ca record of Lake Kusai is well-correlated with the variations and periodicities of solar activity. Therefore, solar output can be suggested as being the predominant forcing mechanism of decadal- to centennial-scale temperature fluctuations over the last 2000 yr. The evolution of effective moisture was inferred from the log-ratios of Rb/Sr, which demonstrated synchronous changes with the typical Indian summer monsoon record from Dongge Cave. These results indicate that the decadal- to centennial-scale effective moisture evolution of the northern Qinghai-Tibetan Plateau is mainly influenced by the Indian summer monsoon. Additionally, we have not found the evident periodicities of solar activity in our effective moisture record over the last 2000 yr.