Asian Summer Monsoon Changes Inferred From a Stalagmite δ18O Record in Central China During the Last Glacial Period
Asian Summer Monsoon Changes Inferred From a Stalagmite δ18O Record in Central China During the Last Glacial Period
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从末次冰河期中国中部石笋δ18O记录推断的亚洲夏季风变化
DOI：
10.3389/feart.2022.863829
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发表时间：
2022-04
影响因子：
2.9
通讯作者：
Zenglin Hong
中科院分区：
文献类型：
--
作者：
Qingmin Chen;Xing Cheng;Yanjun Cai;Qianzhou Luo;Junliang Zhang;Li Tang;Yi Hu;Juangang Ren;Peng Wang;Yan Wang;Yu Zhang;Gang Xue;Jie Zhou;Hai Cheng;R. Lawrence Edwards;Zenglin Hong
重建末次冰期亚洲夏季风的变化对于更好地理解季风动力学具有重要意义。印度夏季风（ISM）和东亚夏季风（EASM）子系统在不同时间尺度上的位相关系尚不清楚。通过对ISM区、EASM区和中国中部地区洞穴沉积记录的对比分析，有助于阐明ISM区和EASM区的关系。根据陕西汉中地东河洞穴DDH-B15石笋的同位素年龄记录，重建了距今34-13万年的ASM变化。18个铀系年龄的平均误差较小（61年），使石笋δ ~（18）O记录与轨道至千年时间尺度上的其他测年记录能进行精确的比较。DDH-B15石笋的δ 18 O信号在轨道时间尺度上受低纬北方半球夏季日照（NHSI）变化的控制。它记录了起源于北方高纬度地区的冷Heinrich Stadial（HS）和Dansgaard-Oeschger（DO）周期。在千年和百年时间尺度上，三个地区石笋的δ 18 O变化相似。但在轨道-亚轨道时间尺度上，石笋δ 18 O在末次冰期旋回的变化具有不同的特征。中国东部石笋δ 18 O值逐渐变负，印度季风区石笋δ 18 O值呈上升趋势，而华中地区石笋δ 18 O值则处于东亚夏季风和印度季风区之间。认为华中地区石笋δ 18 O值是ISM和EASM的混合信号，表明水汽来源的变化对中国石笋δ 18 O记录有重要影响。
The reconstruction of Asian summer monsoon (ASM) changes during the last glacial period is of great significance for better understanding monsoon dynamics. The phase relationship between the Indian summer monsoon (ISM) and East Asian summer monsoon (EASM) subsystems on different timescales is still unclear. The comparative analysis of speleothem records in the ISM region, EASM region, and central China helps to clarify the relationship between the ISM and EASM. Based on the well-dated isotope records of stalagmite DDH-B15 from the Didonghe (DDH) Cave in Hanzhong, Shaanxi, we reconstructed ASM changes during the past 34–13 thousand years before the present (kyr BP). The small average error (61years) of 18 uranium-series ages enables a precise comparison of the stalagmite δ18O record with other well-dated records from the orbital to the millennial timescales. The δ18O signal of the DDH-B15 stalagmite is controlled by changes of the low latitude northern hemisphere summer insolation (NHSI) on the orbital timescale. It records cold Heinrich Stadial (HS) and Dansgaard–Oeschger (DO) cycles which are originated from the northern high latitude on the millennial time scale. The δ18O changes of stalagmites from the three regions are similar on the millennial and centennial timescales. But on the orbital-suborbital timescale, stalagmite δ18O changes during the last glacial cycle have different characteristics. The stalagmite δ18O values in eastern China became gradually negative, and the stalagmite δ18O values in the Indian monsoon domain showed a increasing trend, but the stalagmite δ18O values in Central China adopted an intermediate state between the EASM and ISM. Then we argued that the δ18O value of stalagmites in Central China is a mixed signal of the ISM and EASM, which indicates a change of the water vapor source as an important influence on the Chinese stalagmite δ18O record.
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DOI：
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