全新世长江中下游地区降水变化及其驱动机制  

Holocene Precipitation Change in the Middle and Lower Reaches of the Yangtze River and Its Forcing Mechanisms

作　　者：徐家豪 张志平 陈钧伟 孙炜毅 申忠伟 贾鑫 Xu Jiahao;Zhang Zhiping;Chen Junwei;Sun Weiyi;Shen Zhongwei;Jia Xin(School of Geography,Nanjing Normal University,Nanjing 210023,China;Institute of Environmental Archaeology,Nanjing Normal University,Nanjing 210023,China;Key Laboratory of Virtual Geographic Environment(Ministry of Education),Nanjing Normal University,Nanjing 210023,China;School of Geographical Sciences,Hunan Normal University,Changsha 410081,China)

机构地区：[1]南京师范大学地理科学学院,江苏南京210023 [2]南京师范大学环境考古研究院,江苏南京210023 [3]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210023 [4]湖南师范大学地理科学学院,湖南长沙410081

出　　处：《地球科学》2025年第2期699-717,共19页Earth Science

基　　金：国家自然科学基金项目(No.42301173);江苏省自然科学基金资助(No.BK20230386).

摘　　要：为调和不同研究重建的全新世长江中下游地区降水演化之间的矛盾,集成分析了具有年代可靠、指示意义明确的12条全新世长江中游降水记录和18条全新世长江下游降水记录.结果显示,长江中下游地区降水自全新世伊始逐步增多,中全新世后降水逐渐减少;晚全新世,长江中下游地区降水演化模式出现分异:长江中游整体重新转为湿润,长江下游在波动中趋于干旱.机制方面,全新世长江中下游地区降水演化总体受控于北半球夏季太阳辐射影响.晚全新世,ENSO活动显著增强,亚洲西风急流位置偏南,叠加印度夏季风环流异常,不仅导致长江中下游地区降水演化模式偏离北半球夏季太阳辐射变化趋势,也造成长江中游相对于长江下游形成更为湿润的气候.In order to reconcile the contradictions among the Holocene precipitation records retrieved from different nature archives in the middle and lower reaches of the Yangtze River(MLRYR),this study analyzed 12 Holocene precipitation records in the middle reaches of the Yangtze River and 18 Holocene precipitation records in the lower reaches of the Yangtze River.The results show that the precipitation in the MLRYR has gradually increased since the onset of the Holocene,and then decreased after the middle Holocene.During the late Holocene,the precipitation evolution pattern in the MLRYR was decoupled:the precipitation in the middle reaches of the Yangtze River increased again,while the precipitation in the lower reaches of the Yangtze River tended to decrease with fluctuations.In terms of mechanisms,the Holocene precipitation evolution in the MLRYR was generally controlled by the Northern Hemisphere summer insolation(NHSI).During the late Holocene,the ENSO activity increased significantly,and the position of the Asian westerly jet was shifted to the south,superimposed on the anomalies of the Indian summer monsoon circulation,which not only led to the deviation of the precipitation pattern in the MLRYR from the variation trend of NHSI,but also resulted in the formation of a more wet climate in the middle reaches of the Yangtze River relative to the lower reaches of the Yangtze River.

关 键 词：全新世 长江中下游地区 东亚夏季风 降水变化 驱动机制 地貌学 

分 类 号：P92[天文地球—自然地理学]