高速公路低能见度浓雾监测预报中的几点新进展

Some new developments of the heavy fogs'observation and forecast on the expressway

对沪宁高速公路江苏段26套交通气象自动监测站(AWM)每分钟一次的能见度、相对湿度、温度、风向风速等低能见度浓雾天气过程实时资料分析,证实了浓雾具有较强的地域性特征:在丘陵、水网密集地区多局地性浓雾;日出后是团雾多发时段并阐述了团雾的特征、霾雾混合作用造成的低能见度浓雾过程,同样具有"象鼻形"前兆;夏季由于汤山站地形的原因,会出现单站的低能见度浓雾,因而值得关注。

Based on the real time data including visibility, relative humidity, temperature and wind fields observed per minutes with the 26 AWMs on the Shanghai--Nanjing expressway in Jiangsu province, dense fog and cluster fog have been studied. Investigation indicates that the heavy fog has the regional character ,which often occurs in the area of a hill or a network of rivers; cluster fog often appears after sunrise and found the feature of cluster fog and the low visibility caused by the haze and fog, which appears as a ＂trunk-like＂ pattern. As the result of landform , heavy fog only emerges on the Tangshan station sometimes , and this phenomena deserves attention.