The energy balance closure and standard deviations for vertical wind velocity and scalar quantities were applied to test the liability of measurement results of eddy covariance system at two heights, which provided the foundation for decision of the measurement height. The results showed that 23m was better than 39m in measurement using the standard deviations for vertical velocity and scalar quantities; however, energy balance closure analysis showed that 23m was better than 39m in winter, while 39m better than 23m in spring. Totally, 23m is better than 39m in flux measurements of scalar gases and heat.%主要通过常规气象参数、湍流特性和能量闭合度对2套涡度相关系统的观测结果进行了比较研究.对2层高度湍流特性的研究中,以相似理论为基础,分析了垂直风速的标准差和稳定度参数z/L(观测高度与莫宁霍夫长度比值)的关系,2层观测结果对垂直风速的标准差和稳定度参数z/L的模拟方程显示23m观测数据的模拟结果更符合通用方程的经验参数.最后对2层高度的半年时间内(2003-01-01)～(2003-06-30)总体能量闭合度和能量闭合度的时间变化趋势作了对比研究.结果表明,39m观测结果的总体能量闭合度要高于23m的总体能量闭合度;但从各自的能量闭合度的时间变化来看,23m在冬季的能量闭合度要高于39m,而在春季39m的能量闭合度要高于23m.
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