(毕业论文 字数:9119 页数:20)摘 要:为分析广州地区酸雨的特征,研究广州地区酸雨与气象条件的关系,根据广州市气象局观象台在五山站18年的观测数据,计算和分析了广州降水pH值、酸雨频率的年际和季节变化特征,研究了酸雨与风向、风速的关系。结果表明,广州地区近18年酸雨的平均pH为4.06,酸雨频率高达80.6%。近18年来,广州地区的降水pH值变化不大,但酸雨频率却呈上升趋势。广州降水呈现春季pH值低、酸雨频率高的季节变化特征。研究还表明,酸雨出现时,风速≤2.0 m/s的酸雨频率达76.8%,随着风速的增大,酸雨频率减少;风向为东南和东南偏东风,酸雨发生的机会最大,西北偏北风次之,它们占酸雨总次数的37.8%。 关键词 酸雨特征 降水pH值 酸雨频率 风玫瑰图 Abstract : To analyze the characteristic of acid rain and the relations between acid rain with some meteorological conditions in Guangzhou area, using the data of Meteorological observation ,Wu-shan, Guangzhou during1990-2007, the time variation characteristic of pH value of precipitation and the acid rain frequency , and between acid rain with the wind direction and the wind speed relations were studied. The results showed that the average value of pH was 4.06, the acid rain frequency reached as high as 80.6%. In recent years, the pH value of precipitation changed a little but the acid rain frequency actually assumed the trend of elevation in Guangzhou area. The results still showed that the characteristic of spring’s precipitation pH value was low, acid rain frequency was high. When wind speed was less than 2.0 m/s, Guangzhou area's acid rain frequency reached 76.8%. Acid rain frequency is getting smaller with wind speed enlargement. In southeast and southeast leaning east wind, the frequency of the acid rain is the largest, northwest leaning north wind the second, and the acid rain percentage of three of them is 37.8%. Key words: the characteristic of acid rain; pH value in rain; acid rain frequency; wind rose 目 录 |
广州地区酸雨特征及其与气象条件的关系
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