安顺站不同天气类型下大气电场与气象要素间的关系

Relationship between Atmospheric Electric Field and Meteorological Elements under Different Weather Conditions at Anshun Station

  • 摘要: 利用2020年贵州省安顺站大气电场仪和地面气象要素观测资料,在分析该地区大气电场时间演变特征的基础上,分类讨论了晴天、降雪、强雷暴等天气类型下大气电场与同期气象要素的关系。结果表明:安顺站大气电场全年日变化均为正,夏半年、冬半年和全年平均三者日变化基本一致,在午后到傍晚较低,其数值在夏半年明显弱于冬半年和全年平均。月变化整体呈减弱趋势,其中6~7月有明显的跃升;晴天,大气电场平均强度介于0.15~1.01 KV/m,08时左右达到峰值,17时左右达到谷值,为典型的“单峰单谷”大陆简单型,与气温呈负相关,与相对湿度呈正相关;降雪天气,大气电场平均强度在3 KV/m左右小幅波动,凌晨达到峰值,14时左右达到谷值,与气温基本呈负相关,与相对湿度呈正相关;强雷电天气,大气电场平均强度介于1.5~3.1 KV/m,最强瞬时强度可达几十KV/m,午后开始逐渐增强,傍晚达到峰值,与地面气压和相对湿度均为负相关关系。相对湿度与大气电场的相关性普遍高于地面气压和气温。

     

    Abstract: Based on the observation data of atmospheric electric field instrument and surface meteorological elements at Anshun Station, Guizhou Province in 2020, the temporal evolution characteristics of atmospheric electric field in this region are analyzed, the relationship between atmospheric electric field and meteorological elements in the same period under sunny, snow and strong thunderstorms and other wither types is discussed. The results show that the diurnal variation of atmospheric electric field at Anshun station is positive all year round. The diurnal variations of summer half year, winter half year and annual average are basically the same. The diurnal variation is lower from afternoon to evening, and its value of summer half year is obviously weaker than that in winter half year and the annual average. The monthly variation shows a decresing trend, with a significant jump from June to July. On sunny days, the average intensity of atmospheric electric field is between 0.15 and 1.01 Kv/m, peaking at 08 o 'clock and valleying at about 17 o 'clock. It is a typical single peak and single valley continental simple type, which is negatively correlated with air temperature and positively correlated with relative humidity. In snowfall weather, the average intensity of atmospheric electric field fluctuates slightly at about 3 Kv/m, reaching a peak value in the early morning and the lowest value at about 14:00, which is basically negatively correlated with air temperature and positively correlated with relative humidity. In strong lightning weather, the atmospheric electric field gradually increases in the afternoon and reaches its peak in the evening, showing a negative correlation with surface pressure and relative humidity. Relative humidity is generally more relevant to atmospheric electric field than surface air pressure and temperature.

     

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