Mega-floods over the past 30,000 years in western yunnan, southwest China.

Qi Suo, Qifa Sun, Qian Shi, Min Wang, Hongwei Meng, Linpei Huang, Lixiong Xiang, Caiming Shen

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Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 · The record

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5 · Who and what money

Authors and funding

8 authors.

Qi SuoYunnan Key Laboratory of Plateau Geographical Processes and Environment Changes, Faculty of Geography, Yunnan Normal University, Kunming, 650500, China.

Qifa SunSchool of Chemistry and Geographical Sciences, Chuxiong Normal University, Chuxiong, 675000, China.

Qian ShiEnvironnements et Paléoenvironnements Océaniques et Continentaux (EPOC), UMR CNRS, Université de Bordeaux, Pessac Cedex, 5805, 33615, France.

Min WangSchool of Chemistry and Geographical Sciences, Chuxiong Normal University, Chuxiong, 675000, China.

Hongwei MengYunnan Key Laboratory of Plateau Geographical Processes and Environment Changes, Faculty of Geography, Yunnan Normal University, Kunming, 650500, China.

Linpei HuangYunnan Key Laboratory of Plateau Geographical Processes and Environment Changes, Faculty of Geography, Yunnan Normal University, Kunming, 650500, China.

Lixiong XiangKey Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China.

Caiming ShenYunnan Key Laboratory of Plateau Geographical Processes and Environment Changes, Faculty of Geography, Yunnan Normal University, Kunming, 650500, China. cmshen@hotmail.com.

Funding

National Natural Science Foundation of China 42167065National Natural Science Foundation of China 42177437Yunnan Normal University Doctoral Fund YJSJJ25-A09

6 · The paper itself

Abstract

Global warming has been leading to a significant increase in the frequency and intensity of extreme rainfall events, however, few paleoflood records hinder our understanding of its long-term patterns and underlying mechanisms. Here, we present a record of mega-floods over the past 30,000 years revealed by fossil cladoceran and geochemical proxies from Lake YunlongTianchi (YLTC) in western Yunnan, SW China. Seven mega-floods are identified in terms of abrupt changes in percentages of planktonic cladocerans, planktic-to-littoral (P/L) ratios, cladoceran flux, sedimentation rates, and terrestrial elements. They occurred at 20,410, 16,940, 15,340, 13,930, 11,540, 3,730, and 1,270 BP, when the lake catchment witnessed extreme precipitation and reduced land cover. They were triggered by extreme rainfall induced by monsoon instability, and amplified by decreased infiltration capacity due to reduced land cover. Our results suggest that these mega-floods were likely associated with monsoonal precipitation extremes as well as land cover change in the lake catchment. Our findings provide a reference for both understanding the driving mechanisms of mega-floods during geological times in western Yunnan and assessing regional extreme hydrological risks and adaptive strategies under global warming scenarios.

Indexed as

CladoceraLast Glacial MaximumMega-floodsSouth Asian summer monsoonSouthwest China

Identifiers

PMID41917137

DOI10.1038/s41598-026-46783-5

PMCPMC13187425

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.