Estimating turbulent energy flux vertical profiles from uncrewed aircraft system measurements: exemplary results for the MOSAiC campaign
Estimating turbulent energy flux vertical profiles from uncrewed aircraft system measurements: exemplary results for the MOSAiC campaign
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DOI：
10.5194/amt-16-2297-2023
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发表时间：
2023-05-02
影响因子：
3.8
通讯作者：
Lonardi, Michael
中科院分区：
文献类型：
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作者：
Egerer, Ulrike;Cassano, John J.;Lonardi, Michael
本研究分析了湍流能量通量在北极大气边界层（ABL）的测量与小型无人机系统（sUAS）。湍流通量是大气能量收支的重要组成部分，通过在大气中垂直分布能量影响地面热量平衡。然而，在北极大气边界层的湍流通量的垂直廓线只有少数现场测量存在。该研究提出了一种方法来获得湍流热通量从DataHawk 2 sUAS湍流测量，基于通量梯度法与参数化的湍流交换系数。该参数化是根据高分辨率水平风速测量值以及取决于稳定性的湍流普兰特数和各向异性的公式推导出来的。测量是在2020年融化季节北极海冰的MOSAiC（北极气候研究多学科漂流观测站）考察期间进行的。对于三个例子的情况下，从这个运动，垂直剖面的湍流参数和湍流热通量的气球，雷达和近地面测量相比。所有测量的组合绘制了一致的ABL条件的图片，并证明了独特的潜力，所提出的方法研究湍流交换过程中的垂直ABL剖面与sUAS测量。
This study analyzes turbulent energy fluxes in the Arctic atmospheric boundary layer (ABL) using measurements with a small uncrewed aircraft system (sUAS). Turbulent fluxes constitute a major part of the atmospheric energy budget and influence the surface heat balance by distributing energy vertically in the atmosphere. However, only few in situ measurements of the vertical profile of turbulent fluxes in the Arctic ABL exist. The study presents a method to derive turbulent heat fluxes from DataHawk2 sUAS turbulence measurements, based on the flux gradient method with a parameterization of the turbulent exchange coefficient. This parameterization is derived from high-resolution horizontal wind speed measurements in combination with formulations for the turbulent Prandtl number and anisotropy depending on stability. Measurements were taken during the MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) expedition in the Arctic sea ice during the melt season of 2020. For three example cases from this campaign, vertical profiles of turbulence parameters and turbulent heat fluxes are presented and compared to balloon-borne, radar, and near-surface measurements. The combination of all measurements draws a consistent picture of ABL conditions and demonstrates the unique potential of the presented method for studying turbulent exchange processes in the vertical ABL profile with sUAS measurements.