图1. （a）青藏高原湖泊（面积大于10km²）变化趋势空间分布图，（b）青藏高原站点月平均降水趋势以及降水比例，（c）青藏高原五月平均降水变化趋势图，以及各个气象站五月平均（d）降水和（e）气温变化趋势空间分布图。

Fig.1. The changing characteristics of lake area and meteorological variables over the Tibetan Plateau (TP). (a) The spatial pattern of linear trends of 364 lakes with area surface covering more than 10 km². The diagram in the top right corner depicts the temporal variation of total lake area averaged over 364 lakes. The shading plot depicts the elevation of the TP. (b) The histogram indicates the proportion of climatological monthly accumulated precipitation to the annual amount (red), and the linear trend of monthly accumulated precipitation (blue) during the period of 1976 to 2016. The five-pointed star indicates the linear trend is significant at the 99% confidence level. (c) Time series of the accumulated precipitation in May, and the blue curve indicates the result of a nine-point sliding average. The spatial distribution of (d) accumulated precipitation and (e) surface air temperature (SST) in May over the TP using in-situ daily meteorological observation, respectively.