摘要
利用1971年以来浙江省68个测站的气候资料,统计分析了大雾日数的空间、时间分布特征及其与气象要素的关系.结果表明:浙江省大雾主要出现在东部沿海、浙北的中部和西部、浙中的西部和浙南的西南地区.浙中的南部和浙南的北部是相对少雾区;全省大部分地区年雾日呈下降趋势,特别是20世纪80年代之后下降趋势明显;各地大雾有明显的季节和地区差异.大雾以冬季最多,春、秋季次之,夏季最少.浙北多大雾日主要出现在春季、深秋至冬季两个阶段,浙中南多大雾日主要出现在深秋到冬季,东部沿海多大雾日主要出现在春季到初夏.月最多雾日东部沿海出现在春季,以平流雾为主,其他地区出现在冬季,以辐射雾为主;大雾主要发生在清晨,持续时间大多数在3 h以内.统计表明:相对湿度、风速、气温和地面气压场与大雾形成关系密切.
by using 68 measurement stations＇ climate data sine 1971 in Zhejiang Province, the spatial and temporal characteristics and relations with meteorological elements were analysed. The results showed that the dense fogs mainly appeared at southeastern coast, the central and west areas of north Zhejiang Province, the western areas of central Zhejiang and the southwest areas of south Zhejiang. By contrast, the fogs at south areas of central Zhejiang and north areas of south Zhejiang appeared scarcely. The number of fog day has declined, especially sine 1980＇s. There were distinct seasonal and local differences. The fogs appeared with highest frequency in winter, and spring while less and least in autumn and in summer. The days of fog at north Zhejiang generally appeared in spring and in later autumn to winter, and the central and north Zhejiang in later autumn to winter, and eastern coast in spring to early summer. The monthly days of fog at eastern coast appeared in spring, which were mainly advection fogs. The rest appeared in winter, which were mainly radiative fogs. The dense fogs generally appeared in the early morning, which lasted 3 hours. The statistics showed that relative humidity, wind, temperature and surface＇s pressure have close relationships with fog.
出处
《浙江大学学报（理学版）》
CAS
CSCD
北大核心
2009年第5期594-602,共9页
Journal of Zhejiang University（Science Edition）
基金
浙江省科技厅项目资助(浙江省大雾预报技术研究及高速公路应用试验示范)(2007C23060)
关键词
大雾
气候特征
气象要素
浙江
dense fog
climate characteristics
meteorological element
Zhejiang Province
