热带地理2025，Vol.45Issue(11)：2019-2028,10.DOI:10.13284/j.cnki.rddl.20250581
MIS4/3转换期东亚夏季风增强事件的精细结构及其机制剖析
Fine-Scale Structure Analysis and Mechanism Investigation of East Asian Summer Monsoon Intensification Events during the MIS4/3 Transition Period
摘要
Abstract
High-resolution records and fine structure comparisons between different climate proxies are invaluable for elucidating the detailed variations and mechanisms of the East Asian Summer Monsoon(EASM)intensity.Based on eight high-precision 230Th dates and 448 δ18O data from a stalagmite(YX53)collected from Yongxing Cave in the Shennongjia Forestry District,Hubei Province,China,this study reconstructed a high-resolution EASM evolution sequence spanning 52.45 to 64.44 ka BP.This sequence completely covers Dansgaard-Oeschger(DO)events 18 to 15,and partly covers DO 14.This record not only reveals the rapid onset and gradual decline pattern of DO18 during the Marine Isotope Stage(MIS)4/3 transition but also delineates the sub-millennial-scale internal oscillations within DO17a and two sub-oscillations during DO 16a that are comparable in duration and intensity.It also clearly documents two precursor events(PEs),namely PE 17 and PE16.The results demonstrated that the EASM intensity exhibited a one-to-one correspondence with the Greenland ice core record throughout the DO 18-15 events.However,in the YX53 S18O,Arabian Sea albedo,SCH02 δ18O,and Cariaco Basin albedo records,the intensities of the PE17 and PE16 events are consistently lower than those of the subsequent DO17a and DO 16a events.In contrast,the Greenland ice core record shows that the intensities of the PE17 and PE 16 events are comparable to those of the DO17a and DO 16a events,respectively.Furthermore,the evolution of EASM intensity during the DO events exhibited notable similarities to low-latitude climate processes.During the onset and termination phases of the DO events,changes in the EASM intensity resembled the more gradual transitions that are characteristic of low-latitude records.However,within the DO events themselves,the EASM exhibited internal structures analogous to those observed in low-latitude processes,such as the two sub-oscillations during DO16a that are comparable in duration and intensity,and the rapid-onset-slow-termination transition pattern of DO18.These consistencies indicate a significant modulating influence of low-latitude processes on EASM intensity during the MIS4/3 transition.We propose that the Western Pacific Warm Pool(WPWP)may have influenced the pace of EASM variability and contributed to centennial-scale oscillations within DO events through mechanisms such as air-sea interactions.Based on a stalagmite δ18O record from Shennongjia,this study reconstructs EASM variability during DO events 18 to 15.Through detailed comparisons and analyses of transitional events,we reveal the modulating role of low-latitude processes on the EASM during the MIS4/3 transition.These results suggest that while high-latitude processes primarily drive the initiation and termination of millennial-scale EASM enhancement events,low-latitude processes,which are likely influenced by the WPWP,may shape the intensity and internal structure of these enhancements within DO events.关键词
MIS4/3/东亚夏季风增强事件/先兆性事件/事件结构/低纬过程/石笋Key words
MIS4/3/East Asian Summer Monsoon Intensification Events/Precursor Events/Events Structure/Low-Latitude Process/Stalagmite Records分类
天文与地球科学引用本文复制引用
黄皓翔,陈仕涛,陈公哲,杨舒,王先锋,汪永进..MIS4/3转换期东亚夏季风增强事件的精细结构及其机制剖析[J].热带地理,2025,45(11):2019-2028,10.基金项目
国家自然科学基金项目(42072207、41931178) （42072207、41931178）
江苏省研究生科研与实践创新计划项目(KYCX25_1976) （KYCX25_1976）
