摘要
对2009年2月25日—3月4日湖北恩施雷达站的一次电线积冰过程,使用自动气象站、能见度仪、雾滴谱仪、雨滴谱仪等实测资料进行深入研究,分析了多种气象要素的演变,发现积冰期比无积冰期平均气温低5.6℃。对积冰期间3种天气状况下雾滴谱和降水粒子谱的特征进行了分析,结果表明:雾天和雨天的雾滴谱为单峰型,雨夹雪天为双峰型;雨天和雨夹雪天的降水粒子谱都为单峰型;雾滴平均数密度从大到小依次是:雨天(223.5 cm-3)、雨夹雪天(181.3 cm-3)、雾天(138.7 cm-3);雨天雨滴平均数密度为335.6 cm-3;雨夹雪天降水粒子平均数密度为1 502.1 cm-3。另外,实测数据表明积冰增长率从大到小依次是:雨夹雪天、雨天、雾天。
Based on the observations from the automatic meteorological sensor measurements,the fog monitor,disdrometer and visibility instrument,this paper studies one icing process on wires,and analyses meteorological differences between the icing days and nonicing days in Enshi（Hubei province） from 25 February to 4 March,2009.The results show that the mean air temperature of nonicing time has reduced by 5.6 ℃ in comparison to icing time.The analysis of the characteristics of fog spectra and precipitation particle spectra in three different weather conditions during the icing process shows that the fog droplet spectra,which are both bimodal in foggy days and rainy days,are single-peak in mixed-precipitation days.Besides,the precipitation particle spectra both in rainy days and mixed-precipitation days are single-peak.The mean number concentration of fog drople is the largest in rainy days（223.5/cm^3）,it is less in mixed-precipitation days（181.3/cm^3）,and the least in foggy days（138.7/cm^3）.The mean number concentration of precipitation particle is 335.6/cm^3 in rainy days,and 1502.1/cm^3 in mixed-precipitation days.According to the observation data,the corresponding order for the weather conditions of the icing intensity is mixed-precipitation,rain and fog.
出处
《气象科学》
CSCD
北大核心
2010年第4期481-486,共6页
Journal of the Meteorological Sciences
基金
科技部科技支撑计划项目南方冰雪灾害天气预测预警评估技术研究第一课题(2008BAC48B01)
江苏省教育厅青蓝工程资助云雾降水物理学与气溶胶研究创新团队项目
关键词
积冰
积冰增长率
雾滴谱
降水粒子谱
Icing on wires Icing intensity Fog droplet spectrum Precipitation particle spectrum
