摘要
采用降水离子数据,分析了大连市湿沉降的污染特征。结果表明:大连市降水中离子当量浓度总和冬季最高,春季和秋季相近,夏季最低。相对酸度(FA)呈现冬春季低、夏秋季高的特点。NH_(4)^(+)和Ca^(2+)对降水酸度中和起到重要作用。离子的相关性可以反映离子的来源相互间的潜在关系,SO_(4)^(2-)和NO_(3)^(-)具有很好的相关性,相关系数为0.87;Mg^(2+)既有陆源贡献又有海源贡献;Cl^(-)和Na^(+)高度相关,受海源贡献影响较大。离子的湿沉降通量与降水量变化一致,硫和氮沉降量较大,占研究区域总离子湿沉降通量的61.4%。正定矩阵因子分解(PMF)模型解析降水中水溶性离子主要包括4种来源,夏季二次转化源占比较高,冬季和春季地壳源占比较高。
Based on the precipitation ion data,the pollution characteristics of wet deposition in Dalian city were analyzed.The results showed that the sum of ion concentration in precipitation in Dalian was the highest in winter,similar in spring and autumn,and the lowest in summer.relative acidity(FA)was low in winter and spring and high in summer and autumn.NH_(4)^(+)and Ca^(2+)played an important role in neutralization of precipitation acidity.The correlation of ions can reflect the potential relationship between the sources of ions.SO_(4)^(2-)and NO_(3)^(-)had a good correlation,and the correlation coefficient was 0.87.Mg^(2+)had both terrestrial and marine contributions;Cl^(-)was highly correlated with Na^(+),which was greatly contributed by marine sources.The wet deposition flux of ions was consistent with the change of precipitation,and the deposition of sulfur and nitrogen was relatively large,accounting for 61.4%of the total ion wet deposition flux in the study area.According to PMF model,there were four sources of water-soluble ions in precipitation.The secondary conversion source was relatively high in summer,and the crustal source was relatively high in winter and spring.
出处
《环境保护与循环经济》
2025年第5期77-81,共5页
Environmental Protection and Circular Economy
