| 基于飞机观测资料的降水粒子反射率因子阈值分析 |
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| 引用本文： | 宗蓉,刘黎平,银燕.基于飞机观测资料的降水粒子反射率因子阈值分析[J].大气科学学报,2014,37(4):469-475. |
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| 作者姓名： | 宗蓉 刘黎平 银燕 |
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| 作者单位： | 南京信息工程大学中国气象局气溶胶与云降水重点开放实验室;中国气象科学研究院灾害天气国家重点实验室; |
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| 基金项目： | 公益性行业(气象)科研专项(GYHY201106044);江苏省研究生科技创新计划(CXZZ11-0615) |
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| 摘 要： | 降水粒子对云的生消和演化有非常重要的影响。毫米波雷达适合观测非降水云和弱降水云。利用毫米波雷达数据判断云内降水粒子生成与否有很高的实用价值。本文利用飞机观测的云滴谱数据计算云的反射率因子。将其与雷达探测值进行比对,发现两者有较好的一致性。因此利用滴谱计算的降水粒子反射率因子阈值可以作为雷达判断降水粒子生成的指标。通过分析滴谱计算云滴和降水粒子的反射率因子的概率密度函数可以得到用于区分云滴和降水粒子的反射率因子阈值。通常,云滴的反射率因子不超过-5dBz,降水粒子的反射率因子高于-20dBz,-15~-12dBz可作为判断降水粒子出现的阈值。
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| 关 键 词： | 毫米波雷达 飞机资料 降水粒子 反射率因子 |
| 收稿时间： | 2013/6/1 0:00:00 |
| 修稿时间： | 2013/11/28 0:00:00 |
Analysis of drizzle reflectivity threshold using in-situ measurements |
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| ZONG Rong,LIU Li-ping and YIN Yan.Analysis of drizzle reflectivity threshold using in-situ measurements[J].大气科学学报,2014,37(4):469-475. |
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| Authors: | ZONG Rong LIU Li-ping and YIN Yan |
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| Institution: | Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, NUIST, Nanjing 210044, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, NUIST, Nanjing 210044, China |
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| Abstract: | The drizzle plays an important role in determining the cloud lifetime and evolution.Millimeter wave radar is suitable for detecting non-precipitating and weak precipitating clouds.It is of great valuement to know whether the drizzle occurs or not by the millimeter wave radar measurements.In this paper, the radar reflectivity factor of drizzle is calculated based on the dataset of cloud droplet distribution observed by aircraft.In comparison with the simultaneous radar observations, there is a good agreement between the two reflectivities.The result shows that the reflectivity factor threshold of drizzle derived from in-situ measurements can be used by the radar to diagnose the occurrence of the drizzle.The threshold of reflectivity factor to distinguish drizzle and cloud particles is derived by analyzing the probability distribution function of reflectivity factor due to cloud particles and drizzle drops.Usually, the reflectivity factor of cloud particles is below -5 dBz while the value of drizzle is above -20 dBz.A value between -15 and -12 dBz can be used as the threshold of drizzle. |
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| Keywords: | millimeter wave radar in-situ measurements drizzle reflectivity factor |
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