摘要
利用地面观测资料,对抚州市1959-2009年大雾天气气候概况及气象要素特征进行分析。结果表明,抚州市大雾年平均日数冬春季多、夏秋季少,大雾主要集中在10月到翌年4月;大雾区域分布极不均匀,东多西少,南多北少,山区谷地多平原少;大雾日数随着年代的推移总体呈逐渐减少趋势,平均以1.8d(/10a)的速度减少;大雾日数存在3-6a、12-15a和19-22a的周期变化;大雾存在明显的日变化特征,02-07时是大雾多发时段。当气温为0-10℃、相对湿度为85%-95%、风速为0-3m/s、气压为1005-1 015 hPa时,出现大雾的频率最高。一年中以辐射雾最多,占77.5%;其次是平流-辐射雾,占17.4%;平流雾仅占5.1%。
Using 1959—2009 observation data in Fuzhou,the climatology characteristics of fog are analyzed.The results show that the yearly averaged fog days occurred more in winter and spring than its in summer and autumn.Fog mainly appears from October to April of the next year.The spatial distribution is very uneven and there are 3 fog centers in Fuzhou.The fog days was gradually decreasing in the past 51 years,which average decreasing rate was 1.8 d/10 a.Wavelet analysis indicates that fog days present periodicity cycle of 3—6 years,12—15 years and 19—22 years.Fog occurred with the highest frequency with temperature,relative humidity,wind speed and air pressure occurr at 0—10 ℃,85%—95%,0—3 m/s and 1 005.0—1 015.0 hPa,respectively.Radiation fog accounts for 77.5%,followed by advection-radiation fog,accounting for 17.4%.Three typical weather conditions of fog for short range weather forecast are introduced which are useful for fog forecast.
出处
《气象与减灾研究》
2010年第4期61-66,共6页
Meteorology and Disaster Reduction Research
基金
江西省气象局2009年预报员专项"抚州市大雾预报方法研究"
关键词
大雾
气候概况
气象要素
环流特征
Fog
Climatic characteristics
Meteorological elements
Circulation features.
