| 小冰期多尺度气候波动:贵州董哥洞高分辨率石笋记录 |
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| 引用本文： | 王健,程海,赵景耀,李瀚瑛,宁有丰,张美良,朱晓燕.小冰期多尺度气候波动:贵州董哥洞高分辨率石笋记录[J].第四纪研究,2019,39(3):775-785. |
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| 作者姓名： | 王健 程海 赵景耀 李瀚瑛 宁有丰 张美良 朱晓燕 |
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| 作者单位： | 西安交通大学全球环境变化研究院,陕西西安,710054;中国地质科学院岩溶地质研究所/国土资源部、广西岩溶动力学重点实验室,广西桂林,541004 |
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| 摘 要： | 具有精准年代控制的高分辨率气候记录对于深入研究小冰期气候变化规律具有重要意义。文章基于黔南荔波县董哥洞D41石笋(研究部分长约11.7 cm)的24个U-Th绝对定年和1165组碳、氧稳定同位素测试数据,得到明清小冰期期间(公元1400~1880年)平均分辨率高于0.5年的洞穴上游水汽传输路径的空间集成降雨量变化记录。重建记录表明小冰期内部气候变化存在着多年代际-百年尺度变化趋势和年际-年代际波动;次级波动与干旱事件、火山活动的响应表明石笋δ^18O能够反映一定的大尺度气候信号。D41石笋的δ^18O序列功率谱分析结果显示出160年、11.5年、9年以及14~16、4~7年周期,可能反映了太阳活动和ENSO等地球气候系统内部变率的影响。中国南北方多根石笋氧同位素记录的对比表明崇祯大旱期间(公元1628~1643年)石笋记录显示出与历史文献资料类似的干旱边界,从南方至北方水汽传输路径上,干旱状态反映的空间集成降雨量减少可能是引起北方石笋氧同位素偏重的主要原因。另外,石笋氧同位素记录在年际-年代际尺度上明显的区域差异表明在短尺度上将单个洞穴石笋氧同位素记录用作亚洲季风强度指标时需要谨慎。
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| 关 键 词： | 董哥洞 小冰期 石笋δ^18O 崇祯大旱 |
Climate variability during the Little Ice Age characterized by a high resolution stalagmite record from Dongge Cave,Guizhou |
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| Wang Jian,Cheng Hai,Zhao Jingyao,Li Hanying,Ning Youfeng,Zhang Meiliang,Zhu Xiaoyan.Climate variability during the Little Ice Age characterized by a high resolution stalagmite record from Dongge Cave,Guizhou[J].Quaternary Sciences,2019,39(3):775-785. |
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| Authors: | Wang Jian Cheng Hai Zhao Jingyao Li Hanying Ning Youfeng Zhang Meiliang Zhu Xiaoyan |
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| Institution: | (Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710054, Shaanxi;Institute of Karst Geology, China Institute of Geological Sciences/Key Laboratory of Karst Dynamics, MLR & GZAR, Guilin 541004, Guangxi) |
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| Abstract: | High-resolution and precisely dated climate records are important to further investigate the climate variability during the Little Ice Age(LIA). On the basis of 24^230Th dates and 1165 oxygen and carbon isotope data obtained from stalagmite D41(sample length for 11.7 mm) from Dongge Cave(25°17'50.5"N, 108°02'67"E), Libo, Guizhou, we present here a high-resolution(average resolution better than 0.5 year)δ^18O and δ^13C record across a large portion of the LIA(1400~1880 A.D.). The δ^18O values in the D41 record vary from -8.19 ‰ to -6.64 ‰ with the average value of -7.52 ‰. There exists a significant positive correlation between the δ^18O and δ^13C(Pearson linear correlation coefficient r=0.7882, n=1165, p< 0.001). The δ^18O record shows low excursions during the periods of 1450~1555 A.D. and 1630~1780 A.D., and high excursions during 1400~1450 A.D. and 1555~1630 A.D., with interannual-decadal fluctuations between throughout the record. Power spectrum analysis of the D41 δ^18O revealed periodicities of 160, 11.5 and 9 years similar to solar radiation cycles, as well as periodicity of 4~7 years similar to the ENSO cycle. Additionally, a 14~16-year periodicity appears to be prominent, which may reflect the influence of sea-air circulations and other interaction between different Earth's climate systems. In principle, the lower δ^18O in the D41 record may mainly reflect larger spatially integrated rainfall between the cave site and moisture source along water vapor transmission path. The secondary fluctuations of the D41 δ^18O variance may response to large-scale volcanic and drought events. A close look at different stalagmite δ18O records during the Chongzhen Drought(1628~1643 A.D.) reveals a drought/wet boundary in line with the historical documents. We suggest that the significant differences of δ^18O in stalagmites could be explained by the change of spatial integrated rainfall between the cave site and its upstream rainfall along the moisture transmission path. As such, the high excursions observed in cave δ^18O records from northern China, compared with the absence of the equivalent events in cave δ^18O records from southern China during the Chongzhen Drought event, suggest that the rainfall reduce during the event occurred mainly between the northern and southern cave sites, broadly consistent with the historical documents. Moreover, observations of the temporal and spatial difference between different stalagmite δ^18O records call for a caution to use a single stalagmite δ^18O record as an indicator of Asian Monsoon intensity on annual to decadal timescales. |
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| Keywords: | Dongge Cave LIA stalagmite δ^18O Chongzhen Drought |
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