湖北空气负氧离子浓度等级划分及适应性研究

Study on the Division of the Grade of Air Negative Oxygen Ion Concentration in Hubei Province

采用湖北省17个观测环境一致的国家气象观测站布设的FLZ1自动负氧离子观测设备,通过对比国内外负氧离子浓度等级划分方法,结合湖北省空气负氧离子浓度时空分布特征,利用概率拟合方法对湖北省空气负氧离子浓度进行等级划分并开展其适应性分析,为空气负氧离子浓度监测、评估和服务提供参考。结果表明:当湖北省空气负氧离子浓度参考界限值分别为100、300、500、1 200个/cm^3,即Ⅴ级~Ⅰ级5级划分对湖北及全国有较好的区分适应能力。验证结果显示全国负氧离子分布特征与湖北较为一致,其浓度等级分布频次基本与湖北负氧离子浓度等级分布相对应,等级划分具有可比性。此外,湖北及全国等级分布特征表明春夏季高等级比例高于秋冬季,植被覆盖较高地区空气负氧离子浓度等级明显高于植被覆盖较低地区。

17 national meteorological stations in Hubei are chosen on behalf of the observation stations with the same environment and using the equipment named FLZ1 in line with national and industry standards to detect the air negative oxygen ion concentration. Based on the research on the grade of air negative oxygen ion concentration and the spatial-temporal characteristics of the concentration,the method of probability fitting was used to divide the grade of air negative oxygen ion concentration,and the validation and adaptability of the grade were analyzed in order to provide a reference for air negative oxygen ion concentration monitoring. The results revealed that the threshold values of the five grades,with range from Grade Ⅴ to Grade Ⅰ,are 100 entries/cm3,300 entries/cm3,500 entries/cm3,1 200 entries/cm3 separately which is better to distinguish the concentration in Hubei Province and throughout the country. The verification indicates that the characteristics of national distribution of the air negative oxygen ion are similar with Hubei,and the frequency of each grade in national wide is also accord with those in Hubei which means that the division of the grade is reasonable. Meanwhile the characteristics of the percentage of higher grades in spring and summer are more than those in autumn and winter in Hubei,and the grade in areas with more vegetation coverage is higher than the lower.