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Holocene extreme flood events in the middle reaches of the Lancang- Mekong River basin recorded by a high-altitude lake in southwestern China

文献类型：期刊论文

作者Shao, Shuai3,4,6; Wu, Duo5; Wang, Tao5; Guo, Shilong5; Xiao, Qili5; Li, Youmo5; Feng, Xiaoping2; Deng, Haoxin1,4; Tang, Qiuhong1,4; Chen, Fahu3,5,6
刊名QUATERNARY SCIENCE REVIEWS
出版日期2024-11-01
卷号343页码:15
关键词Lancang-Mekong river Lake baima Holocene Paleoflood Hydrological frequency
ISSN号0277-3791
DOI10.1016/j.quascirev.2024.108918
产权排序6
英文摘要The Lancang-Mekong River (LMR) basin is a region particularly susceptible to floods induced by extreme precipitation. However, owing to limited historical flood records, it is difficult to understand the processes and mechanisms of extreme floods in the LMR basin. In the present study, sediments from a high-altitude lake (Lake Baima, 4700 m above sea level) located in the upper-middle reaches of the LMR are used to reconstruct climate and hydrology variability since the last deglaciation based on a range of climate proxies and methods, including loss-on-ignition, grain size, X-ray diffraction, and X-ray fluorescence. Through the investigation of modern and historical floods in the LMR basin, we combine the climate proxies with hydrological frequency curves to reconstruct the paleoflood sequence during the Holocene. Our results suggest that the temperature and precipitation in southwestern China increased during the Holocene compared to the last deglaciation, indicating a response to changes in Northern Hemisphere summer solar insolation. In addition, Holocene sediments of Lake Baima are primarily composed of brown background layers and numerous light yellow/gray event layers. These event layers are further identified as flood events based on sedimentary facies, redness, and main exogenous elements content and their rate of change. The results show that extreme flood events in the LMR basin occurred more frequently during the early and late Holocene, with seven once-in-1000-year floods during the two intervals; while there were low-frequency flood periods during the mid-Holocene. The occurrence of Holocene floods may be related to external forcing, such as the abrupt changes in total solar irradiance (TSI) and volcanic activity, as well as the internal variability of the wider climate system including the Pacific Decadal Oscillation (PDO) and El Nino-Southern Oscillation (ENSO). When the TSI was low, the Intertropical Convergence Zone (ITCZ) in the Northern Hemisphere shifted northward, and the Western Pacific Subtropical High (WPSH) moved eastward, accompanied with a negative phase of the PDO and La Nina-like phase of the ENSO. The air-sea interactions increased sea surface temperatures, leading to high precipitation and increasing flood risk in the LMR basin.
WOS关键词SUMMER MONSOON EVOLUTION ; EL-NINO ; PALEOFLOOD HYDROLOGY ; TIBETAN PLATEAU ; ORGANIC-MATTER ; SOLAR-ACTIVITY ; CLIMATE-CHANGE ; MASS-MOVEMENT ; SOUTHERN ALPS ; ASIAN MONSOON
资助项目Second Tibetan Plateau Scientific Expedition and Research Program, China (STEP)[42171150] ; National Science & Technology Infrastructure of China[2019QZKK0601]
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:001301645900001
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Second Tibetan Plateau Scientific Expedition and Research Program, China (STEP) ; National Science & Technology Infrastructure of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/208721]  
专题陆地水循环及地表过程院重点实验室_外文论文
通讯作者Wu, Duo
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Environm, Beijing 100101, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China
6.Chinese Acad Sci, Inst Tibetan Plateau Res, Grp Alpine Paleoecol & Human Adaptat ALPHA, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Shao, Shuai,Wu, Duo,Wang, Tao,et al. Holocene extreme flood events in the middle reaches of the Lancang- Mekong River basin recorded by a high-altitude lake in southwestern China[J]. QUATERNARY SCIENCE REVIEWS,2024,343:15.
APA Shao, Shuai.,Wu, Duo.,Wang, Tao.,Guo, Shilong.,Xiao, Qili.,...&Chen, Fahu.(2024).Holocene extreme flood events in the middle reaches of the Lancang- Mekong River basin recorded by a high-altitude lake in southwestern China.QUATERNARY SCIENCE REVIEWS,343,15.
MLA Shao, Shuai,et al."Holocene extreme flood events in the middle reaches of the Lancang- Mekong River basin recorded by a high-altitude lake in southwestern China".QUATERNARY SCIENCE REVIEWS 343(2024):15.

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来源：地理科学与资源研究所

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