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  sensible heat advection
The daytime sensible heat-flux is in phase with the net radiation when there was no sensible heat advection.
      
The role of sensible heat advection in maintaining large latent heat-flux over vegetative surface is discussed.
      
The role of sensible heat advection in maintaining largeQE over the forest surface is discussed.
      


Observation and experiment on the evapotranspiration rates (ET) of farmland were conducted in Dingxi Arid Meteorology and Ecological Environment Experimental Station, Institute of Arid Meteorology, CMA in 1993,1994 and 1996 by using Lysimeter technique and Bowen ratio-energy balance method (BREB). The results show that the BREB overestimated ET by about 20%, which can satisfy the accuracy demands in the semi-arid rainfed agricultural region. Moreover, the error in the BREB calculations of ET is smaller during...

Observation and experiment on the evapotranspiration rates (ET) of farmland were conducted in Dingxi Arid Meteorology and Ecological Environment Experimental Station, Institute of Arid Meteorology, CMA in 1993,1994 and 1996 by using Lysimeter technique and Bowen ratio-energy balance method (BREB). The results show that the BREB overestimated ET by about 20%, which can satisfy the accuracy demands in the semi-arid rainfed agricultural region. Moreover, the error in the BREB calculations of ET is smaller during non-advective periods than in advective periods. The agreement between the BREB method and Lysimeter technique on ET is better, but the Lysimeter technique underestimated ET because water and energy exchange is separated between Lysimeter and around field, and the exact error need to be confirmed by more observation study.

采用波文比能量平衡法和蒸渗计对农田蒸散量进行了为期3a的对比观测试验。结果表明,在半干旱雨养农业区,两者测算的农田蒸散量平均偏差为20%,波文比能量平衡法计算值大于蒸渗计实测值,基本满足精度要求;无感热平流时两种方法所得蒸散量相关性较有感热平流时的好;在平流逆温状态下采用波文比能量平衡法的计算误差大于非平流状态下的计算误差;由于蒸渗计隔断了与周围农田的水热交换,导致了蒸渗计测量的蒸散量较采用波文比能量平衡法的计算值偏低,其偏差大小需要进一步试验确定。

 
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