Abstract:
Based on the temperature and relative humidity observation data of 10 automatic weather stations at different altitudes on the same slope of Wuxi Daguan Mountain from 2019 to 2020, the vertical variation laws of temperature, temperature lapse rate, diurnal temperature range and relative humidity are analyzed. The results show that during the observation period, the temperature decreased with the increase of altitude but there was inversion or same temperature in autumn and winter above 2000m. The annual average temperature drop rate was 0.57℃/100m, and the maximum appeared in March (0.63℃/100m) and September ( 0.62℃/100m), and the minimum occured in February (0.49℃/100m). The diurnal temperature range decreased with the increase of altitude, but at the height of 1065~1222m, there was a downward mutation area, and the diurnal temperature range decreased rapidly with the increase of altitude. At the height of 1222~2180m in spring and 1222m~2550m in autumn, there was a relatively stable layer of daily range, which was not obvious in other seasons. In the area below the height of 1670m, the annual relative humidity was 78.5%, the highest in summer (85.3%), the second in autumn (82%), the third in winter (74.3%) and the lowest in spring (72.3%). With the increase of altitude and the occurrence frequency of cloud and fog, the annual and seasonal relative humidity increased. The height of 1670~1930m was a sudden change range, and the relative humidity increased rapidly. At the height of 1930~2550m, because of the clouds for more time in spring, summer and autumn, the relative humidity changed little. However, in winter, due to low clouds, the areas were above the clouds, and the relative humidity decreased with the increase of altitude.