| 引用本文: | 吴心宇,刘星星,郁科科,张建广,蓝江湖,孙有斌.2026.末次冰盛期以来我国湖泊地球化学元素记录的水文气候时空演化[J].地球环境学报,17(4):930-948 |
| WU Xinyu,LIU Xingxing,YU Keke,ZHANG Jianguang,LAN Jianghu,SUN Youbin.2026.Hydroclimatic spatiotemporal evolution recorded by geochemical elements in Chinese lakes since the Last Glacial Maximum[J].Journal of Earth Environment,17(4):930-948 |
|
| 摘要: |
| 湖泊沉积物元素地球化学指标能够有效记录流域风化、降水和温度变化，是重建古水文气候的重要载体。文章集成我国东南季风区、西南季风区、西风区和青藏高原区48条典型湖泊沉积物元素地球化学记录，系统分析末次冰盛期以来水文气候的时空演变及其驱动机制。结果表明：青藏高原东北缘与中部呈显著偶极型变化，反映季风与西风系统此消彼长所形成的空间跷跷板效应；东南季风区早全新世总体湿润，中全新世长江流域趋干而华北降水增加，可能与西太平洋副热带高压北移及雨带北抬有关；西南季风区早全新世湿润，中晚全新世随印度夏季风减弱而有效湿度下降，晚全新世部分记录受到人类活动扰动；西风区表现出明显的子区域差异，西风核心区中晚全新世持续湿润，而中亚干旱区在中全新世达到湿润峰值，主要受西风强度、降水季节性与蒸发共同控制。总体而言，东南季风区与西南季风区的湖泊众多，受季风影响显著，湖泊水位与水化学变化明显，元素指标能够较为准确地重建流域降水历史；青藏高原区湖泊数量较多，且受人类影响较小，元素指标对气候环境变化响应极为敏感，但元素指标获取和分析需要克服高海拔地理与严酷气候条件带来的限制；西风区由于气候较为干旱，水位波动较大，沉积物保存条件较差，元素的获取与应用存在许多挑战。 |
| 关键词: 湖泊沉积物 元素地球化学 古气候重建 |
| DOI：10.7515/JEE2024145 |
| CSTR：32259.14.JEE2024145 |
| 分类号: |
| 基金项目: |
| 英文基金项目: |
|
| Hydroclimatic spatiotemporal evolution recorded by geochemical elements in Chinese lakes since the Last Glacial Maximum |
|
WU Xinyu1，2，LIU Xingxing1，YU Keke3，4，ZHANG Jianguang1，2，LAN Jianghu1，SUN Youbin1
|
|
1.State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061 , China ；2.University of Chinese Academy of Sciences, Beijing 100049 , China ；3.School of Geography and Environment, Baoji University of Arts and Sciences, Baoji 721013 , China ； 4.Shaanxi Provincial Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji 721013 , China
|
| Abstract: |
| Background, aim, and scope Geochemical indicators in lacustrine sediments can record changes in catchment weathering, precipitation, and temperature and are important archives for paleohydroclimatic reconstruction. Previous studies have largely focused on hydroclimatic histories within individual climatic domains, and nationwide syntheses and comparisons remain limited. This study therefore evaluates the spatiotemporal evolution and possible drivers of hydroclimate across China since the Last Glacial Maximum (LGM). Materials and methods We compiled 48 representative lake-sediment elemental geochemical records indicative of moisture or precipitation from the southeast monsoon region, southwest monsoon region, westerlies region, and Qinghai-Xizang Plateau. Results The northeastern and central Qinghai-Xizang Plateau exhibit a pronounced dipole pattern, reflecting a spatial seesaw associated with changes in the relative influence of the monsoon and westerlies. The southeast monsoon region was generally humid during the Early Holocene. During the Middle Holocene, the Yangtze River Basin became drier, whereas precipitation increased in North China, potentially in response to a northward displacement of the Western Pacific Subtropical High and the associated rain belt. The southwest monsoon region was humid during the Early Holocene, followed by a decline in effective moisture during the middle to Late Holocene as the Indian summer monsoon weakened; some Late Holocene records were partly overprinted by human activities. The westerlies region shows marked subregional differences: the westerlies core zone became progressively wetter during the Mid- to Late Holocene, whereas arid Central Asia reached its moisture maximum during the Middle Holocene, mainly reflecting the combined effects of westerly intensity, precipitation seasonality, and evaporation. Discussion Elemental records from monsoon-dominated lakes generally provide useful constraints on catchment hydroclimate, although their interpretation may be affected by anthropogenic disturbance during the Late Holocene. Lakes on the Qinghai-Xizang Plateau are highly sensitive to environmental change and are relatively weakly affected by human activities, although high-altitude conditions complicate sampling and analysis. In the westerlies region, aridity, large lake-level fluctuations, and variable sediment preservation increase uncertainty in the climatic interpretation of elemental proxies. Conclusions Hydroclimatic evolution across China since the LGM was spatially heterogeneous rather than uniform, with distinct responses among the four climatic regions. Recommendations and perspectives Future reconstructions should integrate multiple proxies and robust chronologies and should explicitly consider lake hydrology, depositional setting, proxy-specific controls, and human disturbance. |
| Key words: lake sediments elemental geochemistry paleoclimate reconstruction |
