摘要
采用2011-2016年合肥地区高时空分辨率的能见度观测数据,分析能见度空间分布特征及大雾生消过程中的能见度变化特点。结果表明:能见度多呈现正态分布且分布相对均匀,有雾时正态分布比例明显下降,非均匀性明显增加;大雾过程中平均能见度变化趋势较为稳定有利于临近预报,而空间最低能见度对临近预报有指示意义;大雾过程中空间变差系数多有明显增加,大雾开始形成和消散阶段空间差异性较大;历史回算表明,利用高密度能见度数据的空间分布和趋势外推,较实际预警发布时间平均提前约1.9h。
Based on the high temporal-spatial resolution visibility data from 2011 to 2016,the spatial distribution characteristics of visibility and its variation in the fog formation process are analyzed.Results show:the ratio of the normal distribution or lognormal distribution in visibility spatial distribution was more than 95%.The ratio decreased significantly while there were fogs;the coefficient of variation formed apeak structure in fog formation process;the high-density visibility data was used to make nowcasting or early warning of heavy fogs and the time was 1.9 hours ahead of the warning time averagely.
作者
周建平
张蕾
王传辉
姚叶青
刘承晓
Zhou Jianping;Zhang Lei;Wang Chuanhui;Yao Yeqing;Liu Chengxiao(Anhui Public Weather Service Center,Hefei 230031)
出处
《气象科技》
2019年第5期866-871,共6页
Meteorological Science and Technology
基金
安徽省重点研究和开发计划项目（1804a0802215）
安徽省气象局科研项目（KM201706）
安徽省气象局预报员专项（kY201704）共同资助
关键词
高密度
能见度
雾
临近预报
high density
visibility
fog
nowcasting
