期刊
JOURNAL OF ASIAN EARTH SCIENCES
卷 229, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2022.105179
关键词
Ca-related indices; Medieval Warm Period; Little Ice Age; SW China; Karst region
资金
- National Natural Science Foundation of China [42007400, 41773140, 41971111]
- National Key Research and Development Project of China [2016YFC0502101]
- Science and Technology Foundation of Guizhou Province [[2020] 1Y193, [2019] 1317]
This study analyzed a peat core from a karst mountain in the western Guizhou Plateau, SW China, to reconstruct the hydroclimatic shifts in the region and explore the significance of Ca-related indices. The results showed abrupt decreases in precipitation and temperature during the 4.2 ka and Little Ice Age (LIA) cold events, and high carbonate contents during the Medieval Warm Period (MWP) were linked to a warm and humid climate. Wavelet analysis also revealed cycles in the Ca content. The study highlights the importance of Ca-related indices in peat deposits from karst regions.
The paleoenvironmental implications of Ca-related indices of peat from karst regions are poorly understood. In this study, we analyze a 450-cm peat core drilled from a sub-alpine karst mountain in the western Guizhou Plateau, SW China. This core is analyzed for carbonate contents and loss on ignition (LOI). High-resolution X-ray fluorescence (XRF) core scanning was also performed to see the variation of chemical compositions. Based on these measurements and 12 accelerator mass spectrometry (AMS)C-14 dates, we reconstructed the history of hydroclimatic shifts in SW China and explored the significance of Ca-related indices. The reconstructed hydro climatic conditions were consistent with the stalagmite, lacustrine sediment, and peat records from the regions controlled by the Indian monsoon. Abrupt decreases in precipitation and temperature were clearly shown during the 4.2 ka and Little Ice Age (LIA) cold events. High carbonate contents in the Yejiping peat during the Medieval Warm Period (MWP) were linked to a warm and humid climate. Additionally, wavelet analysis shows that variations in Ca content have 500, 125, 103, 80, 58, 43, 20, and 12-a quasi-periods, which correspond to the Gleissberg, Pacific Decadal Oscillation (PDO), and Schwabe cycles. Our results highlight the importance of Ca related indices in peat deposits from karst depressions and provide a detailed description of the MWP and the LIA.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据