土中和地表温度影响因子的分析

ANALYSES OF AFFECTING FACTORS FOR SOIL-AND GROUND SURFACE TEMPERATURES

本文用一个土壤和地表温度的计算模式,讨论了土壤物理参数、大气中的云量、大气透明度、土壤模式层厚度以及温度初值给定方法等因子对土壤和地表温度计算结果的影响。表明:土壤密度和比热、土壤导温率越大则地表和土壤内温度日变化越小;但是,土壤内的热量传输越大。云量影响也是显著的,尤其是对土壤内温度的影响,在云量增加时,温度和热量通量均减小。透明度的影响与云量的影响类似。土壤模式层厚度的增加,对地表温度的影响较小,对土壤温度的日振幅影响很大。在夏季,温度初值对地表温度和热通量影响较小,对土壤温度影响较大。

By using a numerical model for seil and ground surface temperatures the effects of some factors on computations are discussed in this paper.Results show that the larger density, specific heatt and heat conductivity of a soil are, the less diurnal temperature variation is, however, the heat transfer in the soil is larger. Cloudiness also has large influences on the soil-and surface temperatures.With increasing cloudiness the temperatures and heat transfer are decreasing, Atmospheric transparency has similar effect as cloudiness. The depth of soil model affects the ground surf acf temperature a little, while considerably affects the soil temperature.In summer the initial values of temperatures have less impacts on surface temperature and heat flux in the soil than on the soil temperature.