Monsoon precipitation variation recorded by tree-ring δ¹⁸O in arid Northwest China since AD 1878

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• 作者：Yu Liu ; Qiufang Cai ; Weiguo Liu ; Yinke Yang ; Junyan Sun ; Huiming Song ; Xuxiang Li
• 关键词：The Northwest China ; Tree-ring δ ; ¹⁸O ; Precipitation ; The East Asian summer monsoon
• 刊名：Chemical Geology
• 出版年：2008
• 期刊代码：12_00092541
• 类别：ear
• 出版时间：30 June 2008
• 卷：252
• 期：1-2
• 页码：56-61
• 文件大小：485 K

摘要

The East Asian summer monsoon (EASM) precipitation from May to August over the Helan Mountains, located in the northwest margin of the EASM, has been investigated through tree-ring δ¹⁸O for the last 120 years. The dry and wet intervals derived from the δ¹⁸O series can be verified by the tree-ring width-based May–July precipitation reconstruction. Most of the time, the δ¹⁸O series and ring width-derived precipitation reconstruction vary synchronously at low frequency. High values of δ¹⁸O correspond to high precipitation periods, and vice versa. Since the 1970s, the East Asian summer monsoon precipitation has been increasing, which was confirmed by other records and documents. Our results show that tree-ring δ¹⁸O can serve as an indicator of the strength of the East Asian summer monsoon variation in the past. We also found that tree-ring δ¹⁸O varies inversely to δ¹³C in the study area.