摘要
Lake surface temperature(LST)is a key parameter in regulating regional water-carbon cycles and biological processes,playing a critical role in the energy and mass balance of lakes.The Tibetan Plateau(TP)is home to thousands of lakes and is highly sensitive to climate change.Therefore,the response of these lakes to a warming climate is crucial for the water security and ecological stability of the“Asian Water Tower”.However,the long-term trend of LST and its driving factors on the TP over the past two decades remain unclear.Here,we employ an all-weather land surface temperature dataset and a representative lake method to investigate the interannual trend of LST on the TP from 2000 to 2022.The analysis uses temperature data from 519 to 581 lakes with interannual dynamic changes in surface area.The results show that lakes on the TP exhibit an overall warming trend,with an average rate of 0.10±0.27℃(10 a)^(-1).Among the representative lakes,61%show a warming trend.The most significant warming occurs in autumn,with 91%of the representative lakes showing an increase in LST(0.47±0.30℃(10 a)^(-1)).The warming rate in spring is about half of that in autumn.In winter,the LST trend exhibits a polarized pattern:although some lakes experience significant warming,more than half show intense cooling.In summer,the trend of LST change is more moderate than that in other seasons.The positive feedback from the reduction in lake ice duration drives the LST trend on the TP.The lake ice duration reduces every 10-day,the annual LST increases 0.4℃.Additionally,altitude and lake expansion can also influence LST changes.Lakes at lower altitudes generally experience higher warming trends.Lake expansion can exacerbate lake warming in autumn by enhancing thermal inertia and delaying lake freeze-up.
基金
supported by the National Natural Science Foundation of China(Grant Nos.52479024&W2412158)。
