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首页> 外文期刊>Australian Journal of Crop Science >Micrometeorological methods to estimate sugarcane evapotranspiration in coastal northeastern region of Brazil
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Micrometeorological methods to estimate sugarcane evapotranspiration in coastal northeastern region of Brazil

机译：估算巴​​西沿海东北地区甘蔗蒸散的微观气象方法

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The aim of the present work was to evaluate the performance of Bowen ratio-energy balance method, as well as the energy balance closure by Eddy covariance technique for a sugarcane crop in Brazilian northeastern region. Micrometeorological measurements were carried out between June 7th and November 17th, 2013. Latent and sensible heat fluxes were determined through Eddy covariance technique (EC) and by the Bowen ratio-energy balance method (BREB), considering two approaches. The first, estimated the air temperature and water vapour pressure gradient in two levels above the canopy. The second method measured the air temperature and water vapour pressure at the first level and the surface temperature from radiometric measurements. Latent heat flux was also estimated as energy balance residue from determinations of the sensible heat flux by Eddy covariance. The degree of energy balance closure was dependent on the time of the day considered. Bowen ratio - energy balance estimated from the first approach, showed the best agreement with the eddy covariance measurements to estimate latent heat flux, while in the second case, when the Bowen ratio was estimated using the surface temperature, the linear relationship was the most discrepant. Therefore, the Bowen ratio conventional method is more suitable for estimating latent heat flux in sugarcane.
机译：本作本作的目的是评估Bowen比率 - 能量平衡法的性能，以及巴西东北地区巴西甘蔗作物的涡旋协方差技术的能量平衡。考虑到两种方法，通过涡流协方识技术（EC）和鲍氏比率 - 能量平衡法（BREB）确定微型气象测量。潜伏和明智的热量通过涡流 - 能量平衡方法（BREB）确定。首先，估计空气温度和水蒸汽压力梯度在冠层上方的两个水平。第二种方法测量第一水平的空气温度和水蒸气压力和从辐射测量的表面温度。潜伏热通量也估计是从涡流协方差的明智热通量的测定来估计能量平衡残留物。能量平衡闭合程度取决于考虑的一天的时间。 Bowen比率 - 从第一种方法估计的能量平衡，显示了与涡旋协方差测量的最佳协议，以估计潜热通量，而在第二种情况下，当使用表面温度估计鲍氏比时，线性关系是最差异的。因此，鲍氏比常规方法更适合于估计甘蔗中的潜热通量。

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