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青藏高原降水变化直接影响多年冻土稳定性及高原生态环境的演变。为定量研究青藏高原降水对多年冻土活动层水热的影响,文中以北麓河冻土工程与环境综合观测站2013年降水资料和活动层水热数据为基础,定量分析了不同季节和不同时刻降水与活动层水热状态的关系。结果表明:1)北麓河地区暖季的高频率、小雨量降水对冻土活动层具有明显的冷却效果;2)冷季降水以少量降雪为主,雪盖厚度薄、持续时间短,不能起到保温层作用,快速融化的雪水反而升高活动层温度;3)不同时刻降雨对活动层的热影响差异明显,14点左右的降雨产生的能量变量最大。
Changes of Precipitation in Qinghai - Tibet Plateau Directly Affect the Stability of Permafrost and the Evolution of Plateau Ecology. In order to quantitatively study the influence of precipitation in Qinghai-Tibet Plateau on hydrothermal activity of permafrost active layer, based on the precipitation data and active layer hydrothermal data of Beiluhe PTA in 2013, this paper quantitatively analyzed the effects of different seasons and periods Relationship Between Time Precipitation and Hydrothermal Status in Active Stage. The results show that: 1) the high frequency and rainfall of precipitation in Beiluhe District have significant cooling effect on the active layer of permafrost; 2) the precipitation in the cold season is dominated by a small amount of snowfall, and the thickness of snow cover is short and the duration is short; The snow melt which melted quickly increased the temperature of the active layer; 3) The difference of the thermal effects on the active layer was obvious at different time, and the maximum of the energy variable produced by the rainfall of about 14 o’clock.