【摘要】 地表温度是地一气相互作用过程中的一个重要参数。利用藏北高原地区那曲高寒气候环境观测研究站地面观测资料,对2001-2012年藏北高原地表温度的年际变化和年内变化规律及其对气候变化的响应特征进行了分析。结果表明,近12年藏北高原地表温度呈缓慢上升趋势,其中冬季上升最快;地气温差在春季最大,且下垫面状况会影响地气温差的大小。地表温度年内变化和日变化特征明显,且气温的变化相对于地表温度存在一定时间的滞后响应。利用气温、风速、土壤湿度分别与地表温度建立关系模型,得出地表温度拟合值与实测值的误差在0~2.0℃之间波动,这表明地表温度对气温、风速、土壤湿度的变化响应明显,其中,对气温变化全年响应明显,冬、春季对风速响应明显,夏季对土壤湿度的响应特征突出。更多还原

【Abstract】 The land surface temperature(T_s) plays an important role on the interaction between atmosphere and ground.The ground observational data from Nagqu Station of Plateau Climate and Environment(NaPlaCE) in the Northern Tibetan Plateau from 2001 to 2012 were used to analyze annual and inter-annual changes and the response to climate changes by statistical analysis method.The result shows that the T_s on the Northern Tibetan Plateau presents a rising tendency in recent years,especially in winter.The difference of T_s and air temperature(T_a) has the maximum in spring,and its value is influenced by the underlying surface.The annual and diurnal variation of the T_s and T_a are obvious,and the T_a variation lags behind T_s.The relationship models based on the T_a,wind speed,soil moisture and T_s demonstrate that the error between the estimated and measured value of T_s fluctuates from 0 ℃ to 2.0 ℃,indicating that T_s and T_a,wind speed,soil moisture are well related to each other.Particularly,the response of T_s to T_a is obvious in all year,the variation of wind speed have a great influence on the changes of T_s in spring and winter,and the relationship between T_s and soil moisture is notable in summer.更多还原