【摘要】 1986年2月23日—3月21日在两广地区有一冷锋降水过程,通过对此期间高、低空流场的分析和72小时空气运动轨迹的计算,得知广州地区高、低空气流的来向和范围;由降水酸度等参数的分时段观测奇知,随冷锋过境中低空气流由北转南的过程,降水酸度逐渐变小;因此可以认为,由湖南等北方工矿区远距离输送气流比海洋气流带有更多的致酸物质。更多还原

【Abstract】 From February 23 to March 2 of 1986, there, was a process of cold front precipitation in Guangdong and Guangxi Provinces.By means of analysing streamline fields of upper air and bottom layer during this pe-riod and of calculating air trajectory for 72 hours, we knew directions and coverages of air stream in different .layers,Having measured acidity and other parameters of precipitation at intervals of time, the results showed: precipitation’s acidity became lower gradually when streams of middle and battom layers turned to the south from the north in a passing cold front. We may consider that air streams travelling from the north industry and mining districts, such as Hunan and other remote provinces bring acidulous .compounds far. more than those coming from offshore areas in .the south.更多还原