Study on Allevation Effects of Vegetation for Climatic Change

为了建立模拟模型来估计植被在减缓气候变化中的作用，在森林和城镇附近进行了温度和风的观测。取得的结果如下。1.夏季，林镇温差基本不变，太阳辐射强度较低时，林镇温差约为2ﾟC。相反，当太阳辐射强度较大时，温差随时间变化，并在傍晚出现峰值。变化幅度为3ﾟC-5ﾟC，森林温度偏低是气候变化的缓解作用。2.在冬季，如果太阳辐射强度较低，差异可以忽略不计。当太阳辐射强度较大时，早晨城镇的温度表现出高于森林的温度。相反，森林在下午表现出比城镇更高的价值。高风速加强了这一趋势。采用三维大涡模拟模型，建立了气流组织的模拟模型。今后，必须考虑热平衡方程。

In order to develop a simulation model to estimate the role of vegetations on alleviation of climatic change, observations of temperature and wind were carried out at vicinity of forest and town. The results obtained are as follows. 1.In Summer, the difference of temperature between forest and town is constant and about 2ﾟC when solar radiation is low intensity. On the contrary, when solar radiation is high intensity, the difference of temperature changes with time and show the peak value at evening. The range of change is 3ﾟC-5ﾟC.These low temperature of forest are the alleviative effect in the climatic change. 2.In Winter, if solar radiation is low intensity, the difference is negligible. If solar radiation is high intensity, the temperature of town shows high value compared to forest in the morning. On the contrary, forest shows high value compared to town in the afternoon. This tendency is strengthened by high wind velocity. The simulation model of air flow is under construction using 3-dimensional LES model. In future, the heat-balance equations must be taken into account.