选址与日冕观测组知识库

为考察大理地区优良天文观测台址,2016年8月在位于大理洱海东岸的挖色镇大城村凤尾箐首次建立了气象站。截至2017年9月已积累一年多的气象资料,可开展初步的大气风速、风向、温度和湿度的分析。通过对该时段气象数据进行系统统计分析,证实该址点具有鲜明的旱季与雨季特征,其中7~9月为雨季,各时段平均湿度均超过75%;2月份最为干旱,其前后3个月白天湿度都在70%以内;湿度曲线显示,6月份出现明显下降,表明该段时间的水汽含量具有明显的局部气候异常特征。由于该址点具有年平均风速小且风向稳定、气候变化具有显著的周期性特征以及周围夜天光污染少等特点,初步判定它是一个适用于教学与科研的理想天文观测候选址点。 

In August 2016, a meteorological station was established in Dacheng village, on the east bank of Dali Erhai lake, in order to find the excellent astronomical observatory site in Dali. Up to September 2017, meteorological data more than one year has been accumulated, and the wind speed, wind direction, temperature and humidity in meteorology can be preliminarily analyzed. It is concluded that this site has distinct dry season and rainy season characteristics. Among them, the period from July to September is the rainy season and the average humidity in each period（dawn，dusk，day，night）is over 75%. In February, the drought was the most severe. The humidity in the day is within 70% from November to April. The humidity curve showed a significant decrease in June,
indicating that the moisture content of the period had obvious local climate anomalies. Due to the small annual average wind speed and wind direction stability, significant seasonal periodicity and little light pollution at night, etc, a preliminary determination can be made that the site is suitable for both teaching and scientific research for astronomical observation.