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利用塔克拉玛干沙漠大气环境观测站2008年7月30日至8月4日的土壤温度、湿度和土壤热通量观测资料,定量分析了沙漠土壤热扩散率、温度、热通量的变化规律。采用谐波法、振幅法、相位法和热传导对流法分别计算了5~20 cm沙漠土壤的热扩散率,在此基础上,以5 cm深度的土壤层为上边界条件,计算了10和20 cm深度的土壤温度和8 cm深度的土壤热通量。结果表明:谐波法计算沙漠土壤温度的精度最高,10和20 cm深度的土壤温度计算值与观测值的标准误差分别为0.167℃和0.127℃;热传导对流法对土壤温度的计算结果好于振幅法和相位法。同样,谐波法计算的沙漠土壤热通量值与观测值的误差最小,计算值与观测值的相关系数R2达到0.976,热传导对流法次之,振幅法和相位法的误差最大。
Based on observations of soil temperature, humidity and soil heat flux from the Taklimakan Desert Atmospheric Environment Observatory from July 30 to August 4, 2008, the laws of thermal diffusivity, temperature and heat flux in desert soil were quantitatively analyzed. The thermal diffusivities of 5 ~ 20 cm desert soils were calculated by harmonic method, amplitude method, phase method and heat conduction convection method respectively. Based on this, the soil layers at a depth of 5 cm were used as the upper boundary conditions to calculate the thermal diffusivities of 10 and 20 Soil temperature at cm depth and soil heat flux at depth of 8 cm. The results show that the accuracy of soil temperature calculation by harmonic method is the highest, and the standard errors of calculated and observed values of soil temperature at depths of 10 and 20 cm are 0.167 ℃ and 0.127 ℃, respectively. The heat conduction convection method is better than amplitude Law and phase method. Similarly, the error of the soil heat flux and the observed value calculated by the harmonic method is the smallest, the correlation coefficient R2 between the calculated value and the observed value reaches 0.976, and the error of the convection heat conduction method, the amplitude method and the phase method are the largest.