冬季贴地层最低温度差异分析

Difference analysis of the minimum temperature near ground in winter

应用2008年冬季最冷时期在福建省长汀县气象站进行的地面、近地面、草面和气温四个层次每日最低温度的观测资料,分析在晴冷型和阴雨型两类天气条件下各层最低温度的差异。结果表明:(1)晴冷型天气时,贴地层中最低温度:地面>近地面>草面,各层温差显著,而气温与地面温度相当;(2)阴雨型天气时,贴地层中最低温度:地面>近地面>气温>草面,各层温差小。影响冬季贴地层最低温度差异的主要气象因子为云量(特别是低云量)、风速、湿度、大气透明度和降水等。

Based daily and air four levels in minimum temperature observation data on the ground, surface and grass ground Changting county weather stations in2008 winter, the differences of minimum temperature on each layer under clear-cold weather and overcast-wet weather were analyzed. The results showed that （1） under the clear-cold weather, the minimum temperature on each levels： ground 〉 surface 〉grass, with significant temperature difference, but the air temperature was similar to the ground temperature. （2） under overcast-wet weather, the minimum temperature on each levels： ground 〉 surface 〉air 〉grass, with small differences. The main meteorological factors, that affect the minimum temperature difference in winter, are cloud content （especially low cloud） , wind speed, humidity, atmospheric transparency and precipitation, etc.