Abstract:Based on the observations from the automatic meteorological sensor measurements, the fog monitor, disdrometer and visibility instrument, this paper studies one icing process on wires, and analyses meteorological differences between the icing days and nonicing days in Enshi (Hubei province) from 25 February to 4 March, 2009. The results show that the mean air temperature of nonicing time has reduced by 56 ℃ in comparison to icing time. The analysis of the characteristics of fog spectra and precipitation particle spectra in three different weather conditions during the icing process shows that the fog droplet spectra, which are both bimodal in foggy days and rainy days, are single-peak in mixed-precipitation days. Besides, the precipitation particle spectra both in rainy days and mixed-precipitation days are single-peak. The mean number concentration of fog drople is the largest in rainy days (2235/cm3), it is less in mixed-precipitation days (1813/cm3), and the least in foggy days (1387/cm3). The mean number concentration of precipitation particle is 3356/cm3 in rainy days, and 15021/cm3 in mixed-precipitation days. According to the observation data, the corresponding order for the weather conditions of the icing intensity is mixed-precipitation, rain and fog.