宁德市消光系数、能见度与PM_(2.5)的关系

Relationship between Extinction Coefficient,Visibility and PM_(2.5) in Ningde City

利用2019年宁德市监测站提供的逐时PM_(2.5)质量浓度和宁德市气象局提供的大气能见度监测数据,探讨了PM_(2.5)与消光系数、能见度的关系。分析结果表明:(1)宁德市PM_(2.5)质量浓度主要集中在0~50μg/m3之间,夏秋两季PM_(2.5)小于春冬两季,总体PM_(2.5)污染不严重。(2)宁德市PM_(2.5)质量浓度与大气消光系数呈线性正相关,与大气能见度呈乘幂负相关关系。(3)在不同相对湿度等级中,消光系数、能见度与PM_(2.5)值关系均保持不变,表明影响大气消光系数和能见度的因子包括大气相对湿度与PM_(2.5)值。

Based on the hourly PM_(2.5) mass concentration provided by Ningde Monitoring Station in 2019 and the atmospheric visibility monitoring data provided by Ningde Meteorological Bureau,this paper discusses the relationship between PM_(2.5) and extinction coefficient,visibility.The analysis results show that:(1)PM_(2.5) mass concentration in Ningde City was mainly concentrated at 0~50μg/m3,PM_(2.5) in summer and autumn was less than that in spring and winter,and the overall PM_(2.5) pollution was not serious.(2)The PM_(2.5) mass concentration in Ningde City had a linear positive correlation with the atmospheric extinction coefficient,and a power negative correlation with the atmospheric visibility.(3)In different relative humidity levels,the relationship between extinction coefficient,visibility and PM_(2.5) value remains unchanged,indicating that the factors affecting atmospheric extinction coefficient and visibility include atmospheric relative humidity and PM_(2.5) value.