中文摘要：

气候变化的海拔依赖性在世界上大多数山脉地区已有报道,但导致这种变异的原因尚不明确。本研究利用中国四个不同的观测和再分析资料数据集,主要研究气候变暖对海拔的依赖性,结果表明：无论是在青藏高原地区还是中国其他地区,气候变暖的程度与海拔高度的一致性并不明显。但是,气候变暖与不同海拔水汽的变异具有很好的相关性。比湿度较低时,气温变化随比湿度的增加而升高;当比湿度上升到一定值,气温变化则随比湿度的增加而下降。而地表温度变化的最大值出现在比湿度2.0–3.0 g kg~（-1）范围内。因此,本研究揭示了水汽对气候变暖的海拔依赖性起到调节作用。

英文摘要：

Elevation dependency amongst climate change signals has been found in major mountain ranges around the world,but the main factors causing this dependency have not been clarified.In this study,four different datasets of observation and reanalysis for China were used to examine the elevation dependency of climate change.A lack of consistency was found in dependency between warming magnitude and elevation across the Tibetan Plateau and China.However,a dependency of climate change on water vapor was detected whereby the temperature trend initially increased at low specific humidity,and then decreased as specific humidity increased.At ground level the maximum trend in temperature appeared in the specific humidity range 2.0–3.0 g kg~（-1）.This suggests that water vapor is a mediator of climate change and may be responsible for elevation-dependent climate change.