大理挖色凤尾箐地区夜天文气象特征的统计分析

Statistical Analysis of Night-time Astronomical and Meteorological Characteristics in Fengweiqing of Dali

利用大理洱海东岸的挖色凤尾箐气象站采集的两年多气象数据,运用统计方法对相对湿度、露点概率、降雨量、气压、温度和风速风向进行了分析。统计分析表明,该地区(2016.08~2018.09)气象条件具有明显的季节性规律:在每年11月至次年4月,相对湿度较小,结露概率较低,降雨量少,气压和气温波动小,风速小且风向稳定,较适合开展连续的夜天文光学观测;在每年5月~10月,湿度偏大,结露概率较高,气压波动较大,在这一时期开展夜间天文光学观测需要注意避开这些不利的气象因素。

The temperature,relative humidity,probability of dew point,rainfall,air pressure and wind speed and direction are analyzed by using the data of over two years from the weather station constructed at the Fengweiqing village,east coast of ErHai lake,Dali.According to the statistics,the meteorological conditions in this region(2016.08-2018.09)show obvious seasonal features:during November and the coming April,the relative humidity and the probability of condensation are low,rainfall is rare,the pressure fluctuation is weak,the wind speed values are small and steady,suitable for night astronomical optical observation.During May and October,the relative humidity values and the probabilities of condensation can be very high,as well as the pressures fluctuate obviously.Such high-humidity periods should be avoided when scheduling for observations.