Arctic observations and numerical simulations of surface wind effects on Multi-Angle Snowflake Camera measurements
Arctic observations and numerical simulations of surface wind effects on Multi-Angle Snowflake Camera measurements
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DOI：
10.5194/amt-14-1127-2021
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发表时间：
2021-02-12
影响因子：
3.8
通讯作者：
Garrett, Timothy J.
中科院分区：
文献类型：
--
作者：
Fitch, Kyle E.;Hang, Chaoxun;Garrett, Timothy J.
基于地面的测量冻结降水的地面风与仪表屏蔽几何形状的相互作用的影响很大。多角度雪花照相机从三个不同的角度拍摄自由下落的水凝物，同时测量其下落速度，已在多个中纬度和极地地点实地使用，有风屏蔽和没有风屏蔽。在这里，我们提出了一个分析北极实地观察-有和没有一个贝尔福特双Alter屏蔽-并比较结果的计算流体动力学（CFD）模拟的气流和相应的粒子轨迹周围的无屏蔽MASC。MASC测量的下降速度与Ka波段大气辐射测量（ARM）天顶雷达（KAZR）的平均多普勒速度相比，只有当风很轻时（
Ground-based measurements of frozen precipitation are heavily influenced by interactions of surface winds with gauge-shield geometry. The Multi-Angle Snowflake Camera (MASC), which photographs hydrometeors in free-fall from three different angles while simultaneously measuring their fall speed, has been used in the field at multiple midlatitude and polar locations both with and without wind shielding. Here, we present an analysis of Arctic field observations - with and without a Belfort double Alter shield - and compare the results to computational fluid dynamics (CFD) simulations of the airflow and corresponding particle trajectories around the unshielded MASC. MASC-measured fall speeds compare well with Ka-band Atmospheric Radiation Measurement (ARM) Zenith Radar (KAZR) mean Doppler velocities only when winds are light (