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Forced changes in a Tibetan lake ecosystem over the past millennium
Wengang Kang1,2, Céline Bonfils3, Rui Li4
1ALPHA, State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China. wengang.kang@itpcas.ac.cn.
Tibetan Plateau lakes show distinct pathways of change driven by climate forcings. Past volcanic cooling and modern warming altered lake conditions, impacting diatom communities and ecosystem variability.
Area of Science:
- Paleolimnology
- Climate Science
- Ecology
Background:
- Aquatic ecosystems are sensitive to climate change, but distinguishing external forcings from internal variability is challenging.
- Tibetan Plateau lakes provide a crucial archive for understanding past environmental changes.
Purpose of the Study:
- To elucidate the distinct pathways through which shared external forcings have influenced Tibetan Plateau limnoecology over the past millennium.
- To differentiate the roles of temperature and precipitation changes in shaping lake ecosystems.
Main Methods:
- Analysis of Tibetan lake ecological reconstructions.
- Utilizing Earth system simulations to model past climate dynamics.
Main Results:
- Identified two pathways: temperature-centric (volcanic cooling, recent warming) and freshening-centric (monsoon shifts, ITCZ influence).
- Preindustrial changes linked to orbital and volcanic forcings; modern changes influenced by industrial aerosols and meltwater.
- Warming has shortened ice cover, increased meltwater, and caused unprecedented diatom shifts.
Conclusions:
- Tibetan lake ecosystems exhibit complex responses to multifaceted stressors, diverging from natural variability.
- Understanding these pathways is crucial for predicting future ecological changes under intensified climate change.
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