Fig. 1: Global and Tibetan Plateau temperature trends and the summer Tibetan Plateau warming amplification (TA).

Normalized time series of global-averaged (shading) and Tibetan Plateau-averaged (blue line) (a) annual mean and (b) summer 2ām temperature during 1940ā2022. k1 and k2 are the linear trends, ** indicates that the linear trend exceeds the 99% confidence level. Regression of summer 2ām temperature (unit: °C) onto the (c) original and (d) detrended TA index during 1976ā2022. The cross lines indicate where the anomalies are significant at the 95% confidence level. The (e) normalized and (f) detrended time series of summer TA during 1976ā2022. The dashed gray line in (e) denotes the linear trend.