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Analysis of Climatic Characteristics of Fog and Haze Weather in Shaoyang in the Past 60 Years and Its Forecast

查看全文 作　　者：Lv [1]Xiaohua;Tang [1]Zuoyang;Lv [1]Weiwei;Tan [1]Dequan;Tang [1]Yaqiong 高影响力作者 机构地区：[1]Shaoyang Meteorological Office,Shaoyang 422000,China高影响力机构 出　　处：《Meteorological and Environmental Research》索引2018年第9卷第3期,共5页高影响力期刊 摘　　要：Based on conventional observation data and NCEP reanalysis data at 10 national basic stations and reference stations of Shaoyang City during 1951-2014,300 cases of typical regional dense fog process appeared in the history were selected. From meteorological factors and weather situation,temporal-spatial distribution characteristics and trend change characteristics of dense fog in Shaoyang were analyzed. The results showed that( 1) temporal-spatial distribution of dense fog in Shaoyang region was uneven,and interannual variability of fog days had large volatility and bad periodicity; dense fog days in Shaoyang region was obviously more in winter half year and less in summer half year. Dense fog was the most in November and the least in July. Dense fog mostly concentrated during 03: 00-09: 00; appearance time mostly concentrated during 05: 00-07: 30,and dissipation time mostly appeared after 08: 30. Dense fog appeared early and dissipated late in winter half year,and vice verse in summer half year.( 2) Seen from meteorological factors,ground and 850 h Pa of wind velocity was generally 0-3 m/s,which was all small. Moreover,there existed temperature inversion from ground to 850 h Pa. Relative humidity on dense fog day was larger,and precipitation or cloudy day mostly appeared in prior day.( 3) There were four kinds of ground weather situation forming dense fog: uniform pressure field type,cold and high pressure bottom type,cold and high pressure rear type,frontal type. Based on grasping change characteristics,rule and formation reason of dense fog,some forecast focus was found. 关 键 词：特征和 雾天气 预报 气候 天气状况 NCEP 分析数据 相对湿度
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