三江平原佳木斯酸雨形成及其影响因素分析

酸雨严重损害农业和森林,利用气候倾向率及相关系数方法统计分析佳木斯站酸雨形成以及风向、风速、降水对酸雨形成的影响。结果表明:酸雨月平均H值与电导率呈明显正相关,为0.707;当SW为主导风向时,酸雨发生频率最大为17%;不同等级降水酸雨发生频率差异大,在降水量5¹0 mm时,酸雨发生的频率最大,超过22%;月平均H最小值出现在8月,为6.13,酸雨发生的频率在8月也最高,为17.61%,酸雨发生次数占降水总数在10月最高,为23.01%,降水酸性在夏季最强,夏季和秋季酸雨发生频率最高;酸雨年平均H值具有明显的升高趋势,升幅为0.311℃/10 a,佳木斯酸雨整体呈下降趋势,受污染程度较轻。

Formation of Acid Rain and Its Causes in Jiamusi of Sanjiang Plain

Acid rain seriously impairs agriculture and forestry.Statistical analysis was made on formation of acid rain and impact of wind direction,wind speed,precipitation on its formation.Results indicated that monthly average H value of acid rain and conductivity were positively correlated,with coefficient as 0.707.When SW was the dominant wind,frequency of acid rain was up to 17%.Different levels of precipitation lead to different frequency of acid rain.When precipitation was 5~ 10mm,frequency of acid rain was the highest more than 22%.The minimum monthly average H value was 6.13 in August,and it was also in August that the frequency of acid rain was up to 17.61%.Occurrence of acid rain accounted for 23.01% of total precipitation,with the highest in October.Precipitation acidity is the strongest in summer,and the occurrence of acid rain is the highest in summer and autumn.Annual average H value is significantly on increasing trend,with an increase of 0.311 ℃/10 a.Because of a less degree of contamination Jiamusi acid rain is overall on a downward trend.