A high-resolution stalagmite record of the Holocene East Asian monsoon from Mt Shennongjia, central China
A high-resolution stalagmite record of the Holocene East Asian monsoon from Mt Shennongjia, central China
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中国中部神农架全新世东亚季风的高分辨率石笋记录
DOI：
10.1177/0959683609350393
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发表时间：
2010-03-01
期刊：
影响因子：
2.4
通讯作者：
Zhao, Kan
中科院分区：
文献类型：
--
作者：
Dong, Jinguo;Wang, Yongjin;Zhao, Kan
中国中部湖北省三宝洞的六个石笋的高分辨率氧同位素（δ O-18）剖面由1413个氧同位素数据和65个Th-230年龄建立，提供了从现在起13-0200年（ky BP，相对于公元1950年）的东亚夏季风（EASM）强度的连续历史。 Delta O-18 记录包括 EASM 演化的四个不同阶段： (1) 突然过渡（类似于 11.5 ky BP）进入全新世； (2) 季风强度逐渐增强的时期(11.5-9.5 ky BP)； (3)最大湿润期(9.5-6.5 ky BP)； (4)季风强度逐渐减弱的时期(6.5-0.2 ky BP)。将三堡与具有可比分辨率的区域记录进行比较表明，印度和东亚季风系统中全新世最佳期（由三角洲 O-18 的最小值定义）的开始和结束时间相似。这支持了这样的观点，即与热带辐合带（ITCZ）平均位置变化相关的季风变化可能会在轨道时间尺度上控制整个亚洲低纬度地区的季风强度。这一观察结果还支持这样的观点，即整个南亚记录的 d18O 的波动反映了季风的广泛变化，而不是当地的降水。三堡的 EASM 记录很大程度上遵循轨道尺度的日照变化，但在全新世早期到中期的千禧年到百年尺度上表现出与格陵兰冰芯 Delta O-18 类似的变化（r = 0.94）。
High-resolution oxygen isotope (delta O-18) profiles of six stalagmites from Sanbao Cave in Hubei province, central China, established with 1413 oxygen isotope data and 65 Th-230 ages, provide a continuous history of East Asian Summer Monsoon (EASM) intensity for the period from 13-0.2 thousand years before present (ky BP, relative to AD 1950). The delta O-18 record includes four distinct stages in the evolution of the EASM: (1) an abrupt transition (similar to 11.5 ky BP) into the Holocene; (2) a period of gradual increase in monsoon intensity (11.5-9.5 ky BP); (3) the maximum humid period (9.5-6.5 ky BP); and (4) a period of gradual decline in monsoon intensity (6.5-0.2 ky BP). Comparison of Sanbao with regional records of comparable resolution reveals that the timing of the beginning and end of the Holocene Optimum ( as defined by the minimum in delta O-18) was similar in the Indian and East Asian monsoon systems. This supports the idea that shifts in the monsoon tied to shifts in the mean position of the Inter-Tropical Convergence Zone (ITCZ) may control monsoon intensity throughout the entire low-latitude region of Asia on orbital timescales. This observation also supports the idea that the fluctuations in d18O recorded across southern Asia reflect broad changes in the monsoon, as opposed to local meteoric precipitation. The EASM records from Sanbao largely follow orbital-scale insolation changes, yet exhibit similar variability to Greenland ice core delta O-18 on millennial to centennial scales during the early to middle Holocene (r = 0.94).