九华山大雾天气气候概况及气象要素特征分析

利用地面气象观测和区域自动气象站探测资料,对九华山大雾天气气候概况及气象要素特征进行分析,结果表明,九华山大雾春季和冬季是多发季节,大雾分布地域性强,时空差异大;大雾日数呈逐年递减的趋势;大雾存在明显的日变化特征,最易生成大雾的时间段在04:00～06:00,占总数的36%,00:00～04:00次之,占总数的28%;大雾的消散时段一般在日出后至正午前,其中08:00～10:00占总数的64%。当气温为0～5℃、相对湿度90%、风速为0～3 m/s时,出现大雾的频率最高。有4种易出现大雾的地面和高空形势场。

Analysis on the Meteorological Features of Fog Weather in Mount Jiuhua

According to the ground meteorological observation and regional automatic weather station observation data,the meteorological features of fog weather in Mount Jiuhua were analyzed.As indicated by the results,the fog occurs frequently in spring and winter with large spatial and temporal distribution;the days with foggy weather show an decreasing trend year by year;the fog is characterized by obvious diurnal variation,most of the fog occurred from 04:00 to 06:00,accounting for 36% of the total,then followed by the period from 0:00 to 04:00,accounting for 28% of the total;the fog usually dissipate after sunrise and by noon,64% of the fog dissipate during 08:00-10:00.The frequency of fog is the highest when the temperature is 0-5 ℃,the humidity is above 90% and the wind speed is 0-3 m/s.There are four ground and high altitude field situations prone to foggy weather.