{"title":"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","authors":"Miaomiao Wang, Haiwei Zhang, Youwei Li, Rui Zhang, Jian Wang, Hanying Li, Yuteng Zhao, Xiaomei Zhang, Zeyuan Liang, Youfeng Ning, Hai Cheng","doi":"10.1016/j.gloplacha.2024.104639","DOIUrl":null,"url":null,"abstract":"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 δ<ce:sup loc=\"post\">18</ce:sup>O and δ<ce:sup loc=\"post\">13</ce:sup>C isotope measurements, spanning the 11.92–47.47 ka BP interval. Our δ<ce:sup loc=\"post\">18</ce:sup>O 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 δ<ce:sup loc=\"post\">18</ce:sup>O shifts in precipitation and stalagmites across the East Asian monsoon region. We found that the amplitude of stalagmite δ<ce:sup loc=\"post\">18</ce:sup>O variations during the HSs decreases progressively from Southwest China to Southeast China, a trend that aligns with simulated changes in precipitation δ<ce:sup loc=\"post\">18</ce:sup>O. The smaller amplitude of δ<ce:sup loc=\"post\">18</ce:sup>O 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 δ<ce:sup loc=\"post\">18</ce:sup>O and δ<ce:sup loc=\"post\">13</ce:sup>C, 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 δ<ce:sup loc=\"post\">13</ce:sup>C 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 δ<ce:sup loc=\"post\">18</ce:sup>O shifts and anti-phased δ<ce:sup loc=\"post\">18</ce:sup>O and δ<ce:sup loc=\"post\">13</ce:sup>C variations during the HSs. Further model simulations are necessary to fully explore the underlying climate dynamics driving these patterns.","PeriodicalId":55089,"journal":{"name":"Global and Planetary Change","volume":"9 1","pages":""},"PeriodicalIF":4.0000,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Stalagmite records of spatiotemporal hydroclimatic variations in monsoonal China during 47–12 ka BP\",\"authors\":\"Miaomiao Wang, Haiwei Zhang, Youwei Li, Rui Zhang, Jian Wang, Hanying Li, Yuteng Zhao, Xiaomei Zhang, Zeyuan Liang, Youfeng Ning, Hai Cheng\",\"doi\":\"10.1016/j.gloplacha.2024.104639\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"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 δ<ce:sup loc=\\\"post\\\">18</ce:sup>O and δ<ce:sup loc=\\\"post\\\">13</ce:sup>C isotope measurements, spanning the 11.92–47.47 ka BP interval. Our δ<ce:sup loc=\\\"post\\\">18</ce:sup>O 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 δ<ce:sup loc=\\\"post\\\">18</ce:sup>O shifts in precipitation and stalagmites across the East Asian monsoon region. We found that the amplitude of stalagmite δ<ce:sup loc=\\\"post\\\">18</ce:sup>O variations during the HSs decreases progressively from Southwest China to Southeast China, a trend that aligns with simulated changes in precipitation δ<ce:sup loc=\\\"post\\\">18</ce:sup>O. The smaller amplitude of δ<ce:sup loc=\\\"post\\\">18</ce:sup>O 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 δ<ce:sup loc=\\\"post\\\">18</ce:sup>O and δ<ce:sup loc=\\\"post\\\">13</ce:sup>C, 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 δ<ce:sup loc=\\\"post\\\">13</ce:sup>C 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 δ<ce:sup loc=\\\"post\\\">18</ce:sup>O shifts and anti-phased δ<ce:sup loc=\\\"post\\\">18</ce:sup>O and δ<ce:sup loc=\\\"post\\\">13</ce:sup>C variations during the HSs. Further model simulations are necessary to fully explore the underlying climate dynamics driving these patterns.\",\"PeriodicalId\":55089,\"journal\":{\"name\":\"Global and Planetary Change\",\"volume\":\"9 1\",\"pages\":\"\"},\"PeriodicalIF\":4.0000,\"publicationDate\":\"2024-11-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Global and Planetary Change\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1016/j.gloplacha.2024.104639\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOGRAPHY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Global and Planetary Change","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1016/j.gloplacha.2024.104639","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOGRAPHY, PHYSICAL","Score":null,"Total":0}
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.
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.