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

LV Hong-yu1,YU Dong-hua2,LI Wen-fu1,XU Cheng-xi1,GUAN Hong-shi1(1.Jiamusi Meteorological Bureau of Heilongjiang Province,Jiamusi 154004,China;2.Siyang Meteorological Bureau of Jiangsu Province,Siyang 223700,China)  
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.
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