河南马沟洞石笋碳氧同位素记录数据集（全新世）

蔡演军及其团队成员利用中国中部河南马沟洞的5支石笋，使用66个高精度铀系年代，测试3846组氧碳同位素，建立了约4年分辨率的东亚季风气候记录。结合中部地区附近的九仙洞，老母洞/东石崖洞石笋氧同位素记录，构建了中部地区全新世石笋氧同位素变化数据集。EEMD（集合经验模态分解）和小波滤波两种方法对马沟洞石笋氧同位素的多尺度分解均表明：轨道尺度东亚季风变化受控于北半球夏季太阳辐射变化，而在全新世大暖期内部（8.5-4.9ka BP），千年和百年尺度的（500-3000年和100-500年）的变化幅度有所减小，揭示在温暖期千年和百年尺度气候波动对区域降水影响的减弱。此外，在全新世大暖期识别出来包括8.2ka事件的14次持续20-70年的弱季风事件。鉴于除了8.2ka事件，其他全新世大暖期的弱季风事件并没有在格陵兰冰心中发现，而热带海温变化对副热带高压具有显著影响，进而提出热带海表温（SST）的变化对这些弱季风事件的形成起到重要作用。尽管全新世内部存在不同尺度的季风气候事件，但由于位于亚热带湿润气候和暖温带半湿润气候过渡带，中部地区的季风降雨变化基本处于相对适宜的范围内。这种温和的降水变化允许和维持了中原地区连续的文化发育，但是仍然调制了不同文化的生计和适应措施。

Yan-Jun Cai and his research team used five stalagmites from Magou Cave, Henan Province, central China, combined with 66 high-precision uranium-series dating results and 3846 sets of analyzed oxygen and carbon isotope data, to establish an East Asian monsoon climate record with a ~4-year resolution. By integrating stalagmite oxygen isotope records from nearby Jiuxian Cave, Laomu Cave and Dongshiya Cave in the central China region, they constructed a Holocene stalagmite oxygen isotope variation dataset for this area. Two methods, Ensemble Empirical Mode Decomposition (EEMD) and wavelet filtering, were applied to the multi-scale decomposition of the Magou Cave stalagmite oxygen isotope record, both revealing that orbital-scale East Asian monsoon variability is controlled by Northern Hemisphere summer solar insolation changes. During the Holocene Thermal Maximum (HTM, 8.5–4.9 ka BP), the amplitudes of millennial-scale (500–3000 years) and centennial-scale (100–500 years) variability decreased, indicating that the impacts of millennial and centennial-scale climate fluctuations on regional precipitation were weakened during this warm period. Additionally, 14 weak monsoon events lasting 20–70 years were identified within the Holocene Thermal Maximum, including the 8.2 ka event. Given that except for the 8.2 ka event, other weak monsoon events during the Holocene Thermal Maximum have not been detected in Greenland ice cores, and tropical sea surface temperature (SST) variability exerts a significant influence on the subtropical high-pressure system, we thus propose that changes in tropical SST play a critical role in the formation of these weak monsoon events. Although multi-scale monsoon climate events occurred within the Holocene, the central China region, located at the transition zone between subtropical humid climate and warm-temperate semi-humid climate, experienced relatively moderate variations in monsoon rainfall within a relatively favorable range. This moderate precipitation variability allowed and sustained the continuous cultural development in the Central Plains region, yet it still modulated the livelihoods and adaptation strategies of different cultures.

搜集汇总

背景与挑战

背景概述

河南马沟洞石笋碳氧同位素记录数据集（全新世）提供了中国中部地区全新世时期的高分辨率东亚季风气候记录，揭示了轨道尺度、千年和百年尺度的气候波动及其与热带海温变化的关联。数据集包含66个铀系年代和3846组同位素测试结果，为研究全新世气候演变和文化发展提供了重要数据支持。