公元前 47-12 ka 年中国季风区时空水文气候变迁的石笋记录

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL Global and Planetary Change Pub Date : 2024-11-20 DOI:10.1016/j.gloplacha.2024.104639
Miaomiao Wang, Haiwei Zhang, Youwei Li, Rui Zhang, Jian Wang, Hanying Li, Yuteng Zhao, Xiaomei Zhang, Zeyuan Liang, Youfeng Ning, Hai Cheng
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引用次数: 0

摘要

最近的高分辨率沉积物记录,如格陵兰冰芯和中国石笋,极大地增强了我们对末次冰川期海因里希滞留期(Heinrich Stadials,HSs)千年尺度气候多变性的了解,尤其突出了亚洲夏季季风(ASM)强度的减弱。这些记录揭示了高纬度气候变化与低纬度季风变率之间的精确时间相关性,尤其是在亚洲季风区。然而,中国东南部石笋记录的稀缺性限制了我们对这些气候突变事件期间季风降水变异时空模式的了解,因为已发表的记录大多集中在中国中北部和西南部。在本研究中,我们利用 42 个 U-Th 日期和 698 个 δ18O 和 δ13C 同位素测量值,基于中国湖北省阴帝洞石笋 YXG01,对 11.92-47.47 ka BP 时段的水文气候进行了高分辨率重建。我们的δ18O记录显示了四次正偏移,表明在最近的四次HS期间(HS1至HS4)ASM强度明显减弱,这与之前的研究一致。在这些HS期间,淡水流入北大西洋,削弱了大西洋经向翻转环流,使北半球气温降低,ASM环流/强度减弱,导致整个东亚季风区降水和石笋的δ18O持续正偏移。我们发现,在 HS 期间,石笋δ18O 的变化幅度从中国西南部到中国东南部逐渐减小,这一趋势与降水δ18O 的模拟变化一致。HS 期间中国东南部的 δ18O 变化幅度较小,这可能与来自西太平洋的水汽增加和局地降水增强有关。在 HS 期间,YXG01 δ18O 和 δ13C 的反相变化以及温度重建和模式模拟表明,长江流域中下游的水文气候条件良好。降水的增加和适中的温度可能促进了植被的生长,从而导致尽管 ASM 环流总体减弱,但岩浆δ13C 值却较低。我们新的YXG01岩浆记录揭示了中国东南地区的两个重要观测结果:恒温恒湿时期较小的岩浆δ18O变化幅度和反相的δ18O与δ13C变化。有必要进行进一步的模式模拟,以充分探索驱动这些模式的潜在气候动力学。
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Stalagmite records of spatiotemporal hydroclimatic variations in monsoonal China during 47–12 ka BP
Recent high-resolution sediment records, such as Greenland ice cores and Chinese stalagmites, have greatly enhanced our understanding of millennial-scale climate variability during Heinrich Stadials (HSs) of the Last Glacial Period, particularly highlighting the diminished intensity of the Asian Summer Monsoon (ASM). These records reveal precise temporal correlations between high-latitude climate changes and low-latitude monsoon variability, especially in the Asian monsoon region. However, the scarcity of stalagmite records from southeastern China has limited our understanding of the spatio-temporal patterns of monsoonal precipitation variability during these abrupt climate events, as most published records are concentrated in central-northern and southwestern China. In this study, we present a high-resolution hydroclimate reconstruction based on stalagmite YXG01 from Yindi Cave, Hubei Province, China, using 42 U-Th dates and 698 δ18O and δ13C isotope measurements, spanning the 11.92–47.47 ka BP interval. Our δ18O record shows four positive excursions, indicating significantly weakened ASM intensity during the four most recent HSs (HS1 to HS4), consistent with previous studies. During these HSs, freshwater influx into the North Atlantic weakened the Atlantic Meridional Overturning Circulation, cooled Northern Hemisphere temperatures, and reduced ASM circulation/intensity, resulting in consistent positive δ18O shifts in precipitation and stalagmites across the East Asian monsoon region. We found that the amplitude of stalagmite δ18O variations during the HSs decreases progressively from Southwest China to Southeast China, a trend that aligns with simulated changes in precipitation δ18O. The smaller amplitude of δ18O shifts in southeastern China during the HSs may be linked to increased moisture contributions from the western Pacific Ocean and enhanced local precipitation. During these HSs, anti-phased variations between YXG01 δ18O and δ13C, together with temperature reconstructions and model simulations, suggest favorable hydroclimatic conditions in the mid-lower reaches of the Yangtze River Valley. Increased precipitation and moderate temperature may have enhanced vegetation growth, resulting in lower speleothem δ13C values despite the overall weakening of ASM circulation. Our new speleothem YXG01 record reveals two important observations from Southeast China: a smaller amplitude of speleothem δ18O shifts and anti-phased δ18O and δ13C variations during the HSs. Further model simulations are necessary to fully explore the underlying climate dynamics driving these patterns.
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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