峨眉山酸雨的时空分布

本文对峨眉山一年中降雨进行了初步研究,其结果表明:峨眉山的降雨具有较高的酸度,pH值介于3.2～7.0之间,其中pH值在4.5～5.0之间的出现频率最高。酸雨的时空分布特征是:(1)垂直分布,海拔2200米以上高度的降雨同山下各点的降雨相比较,前者的pH值比后者的pH值普遍偏低,对于同一场降雨,在海拔高的观测点所测得的pH值较海拔低的观测点为低。(2)随着季节变化,春秋季节降雨的pH值变化最为显著,冬秋季节酸雨严重。

Time and Space Distribution ot the Acid-Rain in Mount Emei

Results of research on the annual precipitation in Mount Emei show that the precipitation is of high acidity, and its pH value is between 3.2 and 7.0 with values between 4.5 and 5.0 occurred most frequently. The distribution of the acid- rain has the following properties: (1) Vertical distribution: Comparing with the downhill zones, the precipitation of uphill zones with an elevation above 2200 metres has lower pH value. For he same one precipitation, its pH value at high altitude is also lower than that at downhill zones; (2) Seasonal changes: The pH value of the precipitation in Spring and Autumn varies remarkably. The acid-rain comes more trequently in Autumn and Winter.