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利用兰州大学半干旱气候与环境观测站(简称SACOL站)2008年夏季晴天的湍流、辐射、土壤温度和通量梯度观测资料,确定了晴天土壤热参数,并结合土壤热流量板测量的温度积分法把实际测量通量推算到地表;讨论了典型黄土高原沟壑区土壤热量储存对地表能量闭合率的影响;建立了计算地表土壤热通量的模型.结果表明:黄土高原典型沟壑区夏季晴天平均土壤热容量为1.23×106 J.m-3.K-1;能量平衡方程中,以5cm埋深处HFP01SC热流量板观测值(G5)表示土壤热通量时,SACOL站地表能量闭合率为75.7%.采用温度积分法,将HFP01SC的直接测量结果校正到地表(Gs)后,地表能量闭合率可以达到81.8%;0～5cm土壤层的热量储存对能量平衡的贡献为6.1%.模型计算得土壤热通量(Gm)与Gs之间的线性回归斜率为0.973(显著性水平为0.1‰).(H+LE)与(Rn-Gm)进行线性回归,得到地表能量闭合率为81.7%.表明模型与温度积分法计算计算土壤热通量非常接近,但通过参数化方法计算时仅需要知道Rn即可.
Based on observation data of turbulent flow, radiation, soil temperature and flux gradient in 2008 summer sunny day by Lanzhou University semi-arid climate and environment observation station (referred to as SACOL station), the soil thermal parameters of sunny day were determined. Combined with the temperature integral The actual measured flux is deduced to the surface of the earth; the effect of soil heat storage on the closing rate of surface energy in typical gully region of the Loess Plateau is discussed; the model to calculate the heat flux of the soil surface is established. The results show that: The soil heat capacity is 1.23 × 106 Jm-3.K-1. In the energy balance equation, the surface energy closure rate of SACOL station is 75.7% when the soil heat flux is represented by the observation value of HFP01SC heat flux plate (G5) at a depth of 5 cm. After the direct measurement of HFP01SC was calibrated to the surface (Gs) by temperature integral method, the surface energy closure rate can reach 81.8%, and the contribution of heat storage in 0 ~ 5cm soil layer to the energy balance is 6.1% .The model calculated soil heat The slope of the linear regression between flux (Gm) and Gs was 0.973 (the significance level was 0.1 ‰). The linear regression of (H + LE) and (Rn-Gm) gave a surface energy closure rate of 81.7% With temperature Method calculation sub-soil heat flux is very close to, but only a method of calculating the parameter needs to know to Rn.