孟津县酸雨变化特征及影响因子浅析

Analysis on the Change Characteristics and Influencing Factors of Acid Rain in Mengjin County

通过对孟津国家基本站2008—2015年酸雨观测资料的统计分析,得出孟津酸雨的月、季、年变化特征,结果表明:孟津常年降水pH为4.71,属中度酸雨;常年降水K值为89.5μS/cm。年平均pH整体呈上升趋势,降水酸性逐年降低;酸雨出现次数波动较大,2011年出现69次为常年最多,2013年出现41次为常年最少;秋季(37.9%)酸雨出现频率最高,夏季次之(29.3%),春季(24%),冬季(8.8%)出现频率最低。酸雨K值与pH整体呈负相关关系,K值越大,则pH越小;K值越小,则pH越大。降水pH与降水样品受污染有一定相关性。大雾天气易导致酸雨出现。

Through the statistical analysis of the observed data of acid rain from 2008 to 2015 in Mengjin National Basic Station, the monthly, seasonal and annual variations of acid rain in Mengjin were obtained. The results showed that the perennial precipitation pH of Mengjin was 4.71, which was a moderate acid rain; perennial precipitation K value was 89.5 μS/cm. The annual average pH value showed an overall upward trend and the acidity of the precipitation decreased year by year. The occurrence times of acid rain fluctuated greatly, with 69 times in 2011 being the highest in the perennial year, 41 times in 2013 being the lowest in the perennial year; the occurrence frequency of acid rain was highest in autumn(37.9%),the second was in summer(29.3%), the third was in spring(24%) and the lowest was in winter(8.8%). The K value and pH of acid rain showed an overall negative correlation, the larger the K value was, the smaller the pH was; the smaller the K value was, the larger the pH was. Precipitation pH had a certain relevance to the contamination of precipitation samples. Foggy weather could easily lead to acid rain.