2006-2014年丹东酸雨统计分析

Statistical Analysis of Acid Rain in Dandong during 2006-2014

采用逐日降水观测资料,记录每次降水开始和结束时点,观测降水量、降水样品温度;3次记录平均降水pH值,用权重的方法统计计算pH值年变化、月变化、季变化,统计降水酸碱度与风向与风速的关系,结论得出:(1)年平均。丹东地区常年降水偏酸性,pH年均值均<5.6。(2)月平均。月分布呈类似正弦曲线分布。(3)季平均。春秋季高,夏冬季低。(4)与风向关系。偏东风特别是东北风向时,对应较多的酸雨天数达到47 d,而偏西向风对应较少的酸雨天数,风向为偏东风向和偏南风向时平均pH值较低也就是酸度较高。风向为偏西风偏北风pH值较高也就是酸度较低。(5)与风速的关系。丹东地区降水pH值随着风速的增大有降低的趋势。也就是随着风速的增大降水酸度增加,但是趋势很不显著。

Using daily precipitation observation data,Recording the start and end time of eachprecipitation;Observed precipitation;Precipitation sample temperature;The average precipitation pH value was recorded in the three time,Using the method of weights to calculate the annual variation,Monthly variation,Seasonal variation of pH value,The relationship between the degree of acidity and alkalinity and the wind direction and wind speed,Conclusions :1.Annually average:Dandong region perennial acidic precipitation,The mean value of pH is less than 5.6;2.Monthly average:The distribution of the monthly distribution is similar to the sine curve;3.Seasonal average:The spring and Autumn period is high,Low in summer and winter;4.Relationship with wind direction:When the east wind,especially the northeast wind direction,Corresponds to more acid rain days to reach 47 days,The west wind with less acid rain days,Wind direction is east to the south wind and the average pH value of low acidity is higher,The wind is westerly winds and the north winds is the higher pH value of lower acidity;5.Relationship with wind speed:The pH value of precipitation in Dandong area has a decreasing trend with the increase of wind speed.The acidity of precipitation increases with the increase of wind speed,But the trend is not significant.