Characteristics of the raindrop distributions in RICO shallow cumulus

Characteristics of the raindrop distributions in RICO shallow cumulus
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RICO浅积云雨滴分布特征

DOI：
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发表时间：
2014
期刊：
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通讯作者：
S. Clanton
S. Clanton
中科院分区：
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文献类型：
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作者：
P. Wehman;Lauren Avellone;Frederick Pecharka;Katti Sorboro;J. Webster;Cynthia Young;Sharon Barton;William A. Robbins;S. Clanton

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抽象的。雨谱的物理特性通常使用解析分布来建模。通常使用伽马分布，在较小程度上使用对数正态分布。文献中的大多数研究侧重于雨滴分布的特征是基于深对流云观测，主要是在地面。本研究的重点是浅积云雨分布在整个云层和云下层的深度使用机载原位测量与粒子测量系统（PMS）光学阵列探测器260 X（OAP-260-X）和PMS二维降水（2DP）仪器在海洋上空积云（RICO）的现场实验的雨。在大涡模拟分辨率（100 m）的尺度上分析的采样谱被发现是相对宽的，形状参数的值-γ律的σ g和对数正态律的σ g-分别在1-3和1.5-2的量级上。形状参数的主要降雨变量（数量浓度，含水量，平均体积直径，沉降通量和雷达反射率）的依赖关系进行了检查，并提出了一个参数化的形状参数σ g和σ g的功能的雨水含量和雨滴数量浓度的幂律。
Abstract. The physical properties of rain spectra are generally modeled using an analytical distribution. It is common for the gamma distribution and, to a lesser extent, the lognormal distribution to be used. The majority of studies in the literature focusing on the characterization of raindrop distribution are based on deep convective cloud observations, mostly at ground level. This study focuses on shallow-cumulus rain distributions throughout the depth of the cloud layer and subcloud layer using airborne in situ measurements made with both the Particle Measuring Systems (PMS) Optical Array Probe 260X (OAP-260-X) and the PMS two-Dimensional Precipitation (2DP) instruments during the Rain in Cumulus over the Ocean (RICO) field experiment. Sampled spectra analyzed on the scale of large-eddy simulation resolution (100 m) are found to be relatively broad, with values of the shape parameter – υ for the gamma law and σ g for the lognormal law – on the order of 1–3 and 1.5–2, respectively. The dependence of the shape parameters on the main rain variables (number concentration, water content, mean volume diameter, sedimentation fluxes and radar reflectivity) is examined, and a parameterization of the shape parameters υ and σ g as a function of a power law of the rainwater content and raindrop number concentration is proposed.