Subjects: Geosciences >> Geography submitted time 2024-04-29 Cooperative journals: 《干旱区研究》
Abstract： Based on data obtained from the Micro Rain Radar (MRR), OTT-PARSIVEL laser raindrop spectrometer, and Rain Gauge (RG) at Zeku Station, the applicability of the MRR in the plateau region was compared and examined for a precipitation weather process on September 17, 2021. The vertical variation characteristics of the MRR observation parameters and raindrop spectrum were investigated at different rain rates. Results show that the observed cumulative rainfall results of the MRR were consistent with those of the raindrop spectrometer and RG, and the MRR 200 m rain rate was highly associated with the raindrop spectrometer inversion value. At various levels of rainfall intensity, differences were found in the vertical distribution of precipitation parameters. Reflectivity, rain rate and liquid water content were affected by evaporation, and they fluctuated from high to low levels in the Ⅰ stage of rain. The evaporation effect was weakened, and the peak height of each microphysical quantity was lower in the II stage of rain. The increase in particle diameter was due to the intensification of collision and coalescence, and the microphysical quantities increased with the decrease in height in the III stage of rain. Precipitation was dominated by small particles, and the raindrop number concentration contribution of small particles at each height layer was the largest. The contribution rate of 1000-4000 m small particles to the rain rate exceeded 90%, and the contribution rate of medium particles below 1000 m to the rain rate increased with the decrease of height. The contribution rate of large particles to the rain rate in the upper layer was greater than that in the lower layer.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2022-10-23 Cooperative journals: 《干旱区研究》
Abstract：利用在三江源区开展的飞机云物理探测试验数据，对2020年9月13日三江源泽库地区一次积层混合云宏微观物理特征及对流泡特征进行分析。结果表明：（1）积层混合云内温度在-23~-10 ℃之间，相对湿度为90%~100%，液态过冷水在0.04~0.70 gm-3之间；（2）对流泡内平均粒子数浓度高于周边层云101 L-1，平均有效粒子半径更大，平均液态过冷水为0.28 gm-3，高于层云约0.03 gm-3，粒子数浓度与液态过冷水有较好的对应关系；（3）云粒子谱呈多峰型分布，峰值出现在50 m、400 m和1000 m，符合典型高云的分布特征；（4）积层混合云中粒子多为聚合状冰晶粒子，部分高度层存在少量六角板状和线状冰晶，云内以凇附增长和聚并增长机制为主，对流泡内存在凝华增长，云内降水机制符合播撒-供给机制。
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