毕凯,丁德平,杨帅,陈景川,黄梦宇. 2021. 一种浸润冻结机制冰核测量装置(FINDA)的搭建与应用[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.052
一种浸润冻结机制冰核测量装置(FINDA)的搭建与应用
Development and application of a Freezing Ice Nucleation Detector Array (FINDA) instrument on immersion mode measurement
投稿时间:2021-03-30  修订日期:2021-05-15
DOI:10.11676/qxxb2021.052
中文关键词:  浸润核化机制 大气冰核 超纯水冻结实验 雪水冰核 冷台
英文关键词:Immersion mode, Atmospheric Ice nucleating particle, ultra-pure water frozen experiment snow water INPs, cold stage
基金项目:国家自然科学基金项目41775138、41930968
作者单位邮编
毕凯 中国气象局华北云降水野外科学试验基地 101200
丁德平 云降水物理研究和云水资源开发北京市重点实验室 100089
杨帅 北京市人工影响天气办公室 100089
陈景川 北京大学环境科学与工程学院 100871
黄梦宇 中国气象局华北云降水野外科学试验基地 100089
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中文摘要:
      为了定量评估降水(雨、雪、雹等)和大气中冰核浓度,本文介绍了一种新型的离线式冰核测量装置(FINDA)用于检测浸润冻结机制的冰核。对多通道测温元件进行了改装和校准,并利用红外热成像仪动态校准了冷台水平温差,开发了自动化软件实现对测量过程的控制和数据解析。通过超纯水冻结实验、雪水及大气样品中冰核检验评估了FINDA的测量性能。结果表明,FINDA温度测量偏差随温度降低而线性增大,-25℃时误差为±0.75℃;超纯水初始冻结温度平均为-21.27±1.45℃,中值冻结温度T50平均为-25.65±0.64℃;对同一降雪融雪样品中冰核浓度温度谱检测,FINDA与其他冻滴设备测量结果基本一致,同冰核浓度下温度偏差小于2℃;大气样品中冰核-20℃时比在线连续流量扩散云室测量值略偏高,与国际上其它学者的结论一致。FINDA能够有效获得0~-25℃之间每隔0.25℃的冰核浓度谱,超纯水和试验操作引入的冰核与对测量结果影响小。设备的广泛应用可帮助深入了解大气冰核在混合云降水中的作用,为预报和云模式的本地化改进和对云降水理论研究提供重要的实验数据和理论基础。
英文摘要:
      To quantify the Ice nucleating particle (INP) concentrations in precipitation (rain, snow, hail, et al.) and atmosphere, a new offline Freezing Ice Nucleation Detector Array(FINDA) instrument is developed to detect the immersion mode INPs. The temperature sensor is modified and calibrated. The horizontal temperature bias of cold stage is measured with an infrared camera and calibrated at each temperature. A software is developed to automatically control the frozen experiment and data analysis. FINDA is validated performing ultra-pure water experiment, and measuring INPs in snow water and air. The result shows that uncertainty of temperature changes lineally as freezing, with±0.75℃ at -25 ℃. The starting frozen temperature is -21.27±1.45℃, and the medium frozen temperature is 25.65±0.64℃. The INPs in snow water by FINDA compare well with other instrument with offset less than 2℃. The result of INPs concentration in the air by FINDA is slightly higher than CFDCs, which compares well with other study. With FINDA, the INPs concentration between 0 and -25℃ with 0.25℃ gap is measured effectively. The INPs induced by ultra-pure water and experiment affect little to the result. The application of FINDA will not only help to further understand the role of INPs in mixed-phase cloud, but also improve the datum and theory support for development of local weather forecast and cloud model ,or the cloud and precipitation theory.
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