2000-2019年浦东机场能见度特征分析

Analysis of Visibility Characteristics from 2000 to 2019 in Pudong Airport

利用2000-2019年上海浦东机场逐时地面观测资料,分析了机场低能见度现象发生的时间分布特征,并与地面其他气象要素进行相关性分析,归纳低能见度天气下各类气象要素的阈值。结果表明:浦东机场能见度月分布呈双峰值特征,峰会出现在9月,1月能见度最低。出现低于2000 m及以下的能见度时,除12月,其他11个月平均相对湿度均超过了90%。能见度分布具有明显的日变化特征,13:00-17:00为能见度的高值区,05:00前后为低值区,冬季低能见度持续时间最长。分析不同等级低能见度与气温、风速、相对湿度之间的关系,发现气温在不同月份有较大差异,两者间的相关性最差,其次为风速,相关性最好的气象要素是相对湿度。

Based on the hourly ground observation data of Shanghai Pudong airport from 2000 to 2019,the time distribution characteristics of airport low visibility are analyzed,and the correlation analysis with other ground meteorological elements is carried out to summarize the thresholds of various meteorological elements under low visibility weather.The results indicates that the monthly visibility distribution of Pudong airport shows the characteristics of double peaks.The summit occurs in September and the visibility is the lowest in January.In case of visibility below 2000 m,the average relative humidity in other 11 months exceeded 90%except December.The visibility distribution has obvious diurnal variation characteristics.13:00-17:00 is the high value area of visibility,before and after 05:00 is the low value area,and the duration of low visibility is the longest in winter.By analyzing the relationship between different levels of low visibility and temperature,wind speed and relative humidity,it is found that the temperature is quite different in different months,and the correlation between them is the worst,followed by wind speed.The meteorological element with the best correlation produces relative humidity.