首页|Intensified warming suppressed the snowmelt in the Tibetan Plateau

Intensified warming suppressed the snowmelt in the Tibetan Plateau

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  • 国家科技期刊平台
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Understanding how hydrological factors interrelate is crucial when examining the impact of climate warming on snowmelt.However,these connections are often overlooked,leading to an unclear relationship between temperature and snowmelt.This study investigates the complex interplay between temperature and snowmelt in the Tibetan Plateau from 1961 to 2020,focusing on how extreme high-temperature events affect the frequency of extreme snowmelt.Using a structural equation model,we detected three temperature-related factors that predominantly influenced snowmelt and extreme snowmelt.The annual average temperature was found to have a significant indirect impact on snowmelt,mediated by changes in snowfall,snow depth and snow cover.By contrast,high-temperature days(daily maximum temperatures exceeding the 90th percentile)and heat waves(at least three consecutive high-temperature days)negatively affected extreme snowmelt directly or indirectly.The direct effect of increasing extreme temperature events was associated with an earlier onset of high-temperature periods,which accelerated snowmelt and shortened the duration of extreme snowmelt periods.Additionally,the reduction in snow cover owing to warming emerged as a main factor suppressing snowmelt and extreme snowmelt frequencies.We also revealed spatiotemporal variations in the temperature-snowmelt relationship that highly depended on changes in snowmelt patterns.The study elucidated why warming suppresses snowmelt and extreme snowmelt events in the Tibetan Plateau,highlighting the mediating roles of snow-related and phenological factors.The findings will provide scientific support for climate simulation and water management policymaking in alpine regions worldwide.

Climate changeExtreme temperatureSnowmeltStructural equation modelTibetan Plateau

Xiang LI、Peng CUI、Xue-Qin ZHANG、Fang ZHANG

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Key Lab of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Beijing 100101,China

University of Chinese Academy of Sciences,Beijing 100049,China

China-Pakistan Joint Research Center on Earth Sciences,Chinese Academy of Sciences and Higher Education Commission,Islamabad 45320,Pakistan

Second Tibetan Plateau Scientific Expedition and Research Program(STEP)Special Project for the Construction of Nyingchi National Sustainable Development Pilot ZoneStrategic Priority Research Program of the Chinese Academy of Sciences

2019QZKK09032023-SYQ-006XDA23090302

2024

10.1016/j.accre.2024.06.005

气候变化研究进展(英文版)
国家气候中心

气候变化研究进展(英文版)

影响因子：0.806
ISSN：1674-9278
年,卷(期)：2024.15(3)