The Heat-Flux Imbalance: The Role of Advection and Dispersive Fluxes on Heat Transport Over Thermally Heterogeneous Terrain
The Heat-Flux Imbalance: The Role of Advection and Dispersive Fluxes on Heat Transport Over Thermally Heterogeneous Terrain
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DOI：
10.1007/s10546-021-00687-1
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发表时间：
2022-02
影响因子：
4.3
通讯作者：
T. Morrison;E. Pardyjak;M. Mauder;M. Calaf
中科院分区：
文献类型：
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作者：
T. Morrison;E. Pardyjak;M. Mauder;M. Calaf
用于量化空间异质性的理想化平面阵列实验的数据用于对温度趋势方程的全导数执行控制体积分析 (4004002 m)。热通量不平衡的分析被定义为平流、弥散和湍流通量项之和与湍流通量项之比。结果分为自然对流日和强制对流日，以及高风速和静止的夜间时段。研究结果表明，与自由对流时期（湍流通量高估 79%）相比，强制对流日（湍流通量高估 168%，或平流对分散通量与湍流通量的相对重要性）的中值通量不平衡更大。在夜间，静止夜晚的湍流通量中值被低估了 146%，高风速夜晚的通量被低估了 43%。这些结果支持现有文献，表明平均气温不均匀性导致强烈的整体平流和分散通量。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。
Data from the Idealized Planar-Array experiment for Quantifying Spatial heterogeneity are used to perform a control volume analysis (4004002 m) 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.