Data from the Idealized Planar-Array experiment for Quantifying Spatial heterogeneity are used to perform a control volume analysis (400 \(\times \) 400 \(\times \) 2 m\(^3\)) on the total derivative of the temperature tendency equation. Analysis of the heat-flux imbalance, which is defined as the ratio of the sum of advective, dispersive, and turbulence-flux terms to the turbulence-flux term, are presented. Results are divided amongst free-convective and forced-convective days, as well as high-wind-speed and quiescent nocturnal periods. Findings show that the median flux imbalance is greater on forced-convective days (a 168% turbulence-flux overestimation, or relative importance of the advection to dispersive flux to the turbulence flux) when compared to free-convective periods (79% turbulence-flux overestimation). During nocturnal periods, a median turbulence-flux underestimation of 146% exists for quiescent nights and a 43% underestimation of the flux for high-wind-speed nights. These results support the existing literature, suggesting that mean air-temperature heterogeneities lead to strong bulk advection and dispersive fluxes. A discussion of the impact of the flux imbalance on the surface energy balance and numerical-weather-prediction modelling is presented.

来自用于量化空间异质性的理想化平面阵列实验的数据用于执行控制体积分析 (400 \(\times \) 400 \(\times \) 2 m \(^3\)) 对温度趋势方程的全导数。介绍了热通量不平衡的分析，该不平衡定义为平流、分散和湍流-通量项之和与湍流-通量项之比。结果分为自由对流和强制对流日，以及高风速和静止的夜间时段。研究结果表明，与自由对流期（79% 的湍流-通量）相比，强迫对流日的中位通量不平衡更大（高估了 168% 的湍流-通量，或平流对分散通量相对于湍流的重要性）高估）。在夜间，静止夜晚的湍流通量中值被低估了 146%，而高风速夜晚的通量被低估了 43%。这些结果支持现有文献，表明平均气温异质性导致强烈的体积平流和分散通量。讨论了通量不平衡对地表能量平衡和数值天气预测建模的影响。