摘要
利用广州白云机场 1970～ 2 0 0 0年逐时能见度观测资料 ,对白云机场低能见度的气候特征进行统计分析。结果表明 :小于等于 1km的低能见度有明显的 8年周期变化 ,小于等于 0 8km和 0 5 5km的低能见度主要振荡周期是 6～ 10年 ;自 2 0世纪 70年代出现能见度小于等于 1km的日数有逐年上升趋势 ,其中 90年代出现的日数明显偏多 ,80年代相对偏少 ;低能见度有明显的季节变化和日变化特征 ;低能见度平均出现次数与持续时间明显成反比 ;
s: By using the 31 year's hourly observational visibility information from 1970～2000 at Guangzhou Airport the low visibility( V ≤1000m) climatic characteristics has been analyzed. The result shows that the low visibility below 1km has an obvious period variation of 8 years, for low visibility below 0.8km and below 0.55 km, the main vibration period is 6～10 years. From the 70s of last century, the days of low visibility have a trend to increase, and in the 90s of last century the days of low visibility are more than usual, while in the 80s the days are less that usual. The low visibility has a significant characteristic of seasonal and daily variation. The times of low visibility is inverse proportion to the time of lasting. The reasons that cause low visibility are only fog and rain.
出处
《气象科技》
北大核心
2003年第3期163-166,共4页
Meteorological Science and Technology
关键词
能见度
气候特征
振荡周期
季节变化
日变化
low visibility,climatic characteristics,vibration period,seasonal variation,daily variation
