The Impact of Surface Temperature Heterogeneity on Near-Surface Heat Transport
The Impact of Surface Temperature Heterogeneity on Near-Surface Heat Transport
复制标题
表面温度不均匀性对近地表传热的影响
DOI：
10.1007/s10546-021-00624-2
复制
发表时间：
2021
影响因子：
4.3
通讯作者：
Pardyjak, Eric
中科院分区：
文献类型：
--
作者：
Morrison, Travis;Calaf, Marc;Higgins, Chad W.;Drake, Stephen A.;Perelet, Alexei;Pardyjak, Eric
对流期间地面能量平衡的实验闭合是一个长期存在的问题。从理想化的水平平面阵列实验量化表面异质性的实验数据，计算的温度趋势方程的条款，重点是总导数。该实验于2019年夏天在美国陆军杜格威试验场的表层湍流和环境科学试验设施进行。实验布局包含一个阵列的21通量站超过1公里的网格。感热通量表现出很高的空间变异性，最大的变化发生在对流期间。垂直热通量的最大变率为50-80 W m（中位变率为40%），而水平通量的最大变率为200-500 W m（流向通量的中位变率为48%，展向通量的中位变率为40%）。在对流下午期间计算的平均值显示出大幅度的水平平流（48 W莫尔172 K小时）和垂直通量发散（13 W莫尔47 K小时）。从对流情况下的总衍生物的概率密度函数显示平均体积加热率为43 W米（154 K小时）相比，13 W米（47 K小时）的非对流天。一个概念模型的基础上持久的平均流结构从当地表面温度的不均匀性可以解释所观察到的平流。该模型描述了本地驱动的平流和大尺度强迫驱动的平流之间的差异。检查的情况下，83%的流向和81%的展向平流在不稳定时期被归类为本地驱动附近的表面热不均匀性。
Experimental closure of the surface energy balance during convective periods is a long-standing problem. With experimental data from the Idealized horizontal Planar Array experiment for Quantifying Surface heterogeneity, the terms of the temperature-tendency equation are computed, with an emphasis on the total derivative. The experiment occurred at the Surface Layer Turbulence and Environmental Science Test facility at the U.S. Army Dugway Proving Ground during the summer of 2019. The experimental layout contained an array of 21 flux stations over a 1 kmgrid. Sensible heat fluxes show high spatial variability, with maximum variability occurring during convective periods. Maximum variability in the vertical heat flux is 50–80 W m(median variability of 40%), while in the horizontal flux, it is 200–500 W m(median variability of 48% for the streamwise and 40% for the spanwise fluxes). Ensemble averages computed during convective afternoon periods show large magnitudes of horizontal advection (48 W mor 172 K h) and vertical flux divergence (13 W mor 47 K h). Probability density functions of the total derivative from convective cases show mean volumetric heating rates of 43 W m(154 K h) compared to 13 W m(47 K h) on non-convective days. A conceptual model based on persistent mean flow structures from local-surface-temperature heterogeneities may explain the observed advection. The model describes the difference between locally-driven advection and advection driven by larger-scale forcings. Of the cases examined, 83% with streamwise and 81% with spanwise advection during unstable periods are classified as locally driven by nearby surface thermal heterogeneities.
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