Downward longwave radiation estimates for clear-sky conditions over northeast Brazil
Downward longwave radiation estimates for clear-sky conditions over northeast Brazil
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DOI：
10.1590/s0102-77862011000300010
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发表时间：
2011-04
影响因子：
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通讯作者：
C. Santos;B. B. Silva-B.;T. Rao;P. Satyamurty;A. Manzi
中科院分区：
文献类型：
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作者：
C. Santos;B. B. Silva-B.;T. Rao;P. Satyamurty;A. Manzi
本文的主要目的是评估9个下行长波辐射方程在晴空条件下的性能，并利用观测的水汽压和气温资料建立一个局部调整的方程。2005年10月至2006年6月，在巴西东北部半干旱地区香蕉园实验场安装的微气象塔上测量了辐射和大气参数。对下行长波辐射计算模式白天和夜间的计算结果与实测值进行了对比统计，结果表明，物理基础较多的参数化模式的计算结果最好。1993年建立的局部校正方程和Sugita和Brutsaert模型与实测值的误差小于1.0%。下行长波辐射是微气象研究中要监测的辐射预算中最昂贵和最困难的组成部分之一。因此，当地调整后的方程可以用来估计巴西东北部半干旱地区的下行长波能量，这些能量需要作为一些农业和水文模型的输入，而这些地区的长波能量没有得到监测。
The main objective of this paper is to assess the performance of nine downward longwave radiation equations for clear-sky condition and develop a locally adjusted equation using the observed vapor pressure and air temperature data. The radiation and atmospheric parameters were measured during the months of October 2005 to June 2006 at a micrometeorological tower installed at the experimental site in a banana orchard in the semiarid region of Northeast Brazil. The comparative statistics for the performance of the downward longwave radiation calculation models during daytime and nighttime compared to measured data have shown that the parameterizations with more physical foundations have the best results. The locally adjusted equation and Sugita and Brutsaert model developed in 1993 showed errors less than 1.0% in comparison with measured values. Downward longwave radiation is one of the most expensive and difficult component of the radiation budget to be monitored in micrometeorological studies. Hence, the locally adjusted equation can be used to estimate downward longwave energy, needed as input to some agricultural and hydrological models, in semi-arid regions of the Northeast Brazil, where this component is not monitored.