中文摘要：

青藏高原隆升速率是研究者们关注的问题。由于海拔升高引起地表温度降低,形成了现今的青藏高原冻土层。抬升速率不同,冻土层的形成历史和现今状态也会不同,因此,冻土层内可能包含了高原抬升的有关信息。本文用有限元方法计算了同一地点分别用2Ma时间和5Ma时间由1000m抬升到5000m的两种抬升速率下的情景。计算表明快速抬升和慢速抬升形成的冻土层厚度会有一定的差别,慢速抬升时有更长的热传导时间,形成的冻土层略厚,冻土层年龄较老。所以存在通过现今冻土层厚度、温度随深度变化、以及冻土年龄等资料,并在测得冻土准确参数的条件下,有助于估测青藏高原隆升的时间和过程。

英文摘要：

The problems of the Qinghai-Tibet plateau uplift have never failed to attract researchers＇ attention. The formation of permafrost in the Qinghai-Tibet plateau resulted from temperature decreasing due to rising elevation. Rising rate is believed to be closely related to formation history and current configuration of permafrost and it is very likely that the permafrost contains the Qinghai-Tibet plateau uplift information. Our study presumed a scenario in which it would take 2 Ma and 5 Ma years to lift for one place to rise from 1000 m to 5000 m. The calculation shows that different rising rate may result in the different thickness of permafrost. In the model with a low rising rate, permafrost has much time for heat conduction, thus permafrost tends to be much thick and old. Based on the thickness of existing permafrost, geotherm change, and age and precise parameters of permafrost, this study acquired some understanding about uplift’s time and process of the Qinghai-Tibet Plateau.