临安市不同功能区空气负离子日变化特征及其与环境因子的关联分析

Diurnal Changes of Air Anions and Its Relation with Environmental Factors in Different Functional Zones of Lin’an City

为了研究临安市空气负离子日变化特征及其与环境因子的相关关系,对临安市具有代表性的3个不同功能区(城郊森林、教学区、市中心)空气正、负离子浓度和主要环境因子(温度、相对湿度、风速、光量子、可吸入颗粒物)进行同步监测。结果表明:城郊森林空气负离子日平均浓度和CI指数都明显高于教学区和市中心,3个功能区空气负离子浓度日间极值出现时间存在明显差异,空气负离子日变化趋势与相对湿度的日变化趋势相同,与温度、光量子、风速的日变化趋势相反,而空气正离子的日变化趋势与可吸入颗粒物的日变化趋势相同。不同功能区,温度、相对湿度与负离子平均关联系数分别为0.818、0.821,其次为光量子和可吸入颗粒物,风速对空气负离子影响最小。温度和相对湿度是影响空气负离子浓度主要的环境因子。

Air anion density was monitored along with air temperature,relative air humidity,wind speed,sunlight intensity and PM10 in three typically different functional zones of Lin’an city,Zhejiang province to study diurnal changes of air anions and its correlation with environmental factors in different functional zones.The results showed that the daily average air anion density and the average air clean index（CI） at suburb forest were significantly higher than that at campus and central urban districts,and different functional zones had their own daily air anion density peaks.The diurnal change tendency of air anion density was the same as that of relative air humidity,but opposite to that of air temperature,winds speed and sunlight intensity.The most important factors affecting air anion density were air temperature and relative air humidity,for which the correlation index was 0.818 and 0.821 respectively,followed by sunlight intensity,PM10 and wind speed.