五台山气溶胶浓度变化特征及气象因子影响分析

Characteristics of aerosol concentration variation and influence of meteorological factors in Mount Wutai

利用五台山大气成分站的气溶胶浓度数据和五台山站地面常规观测资料,对五台山的PM_(10)、PM_(2.5)的日变化、年变化特征及其与气象因子的关系进行了相关性研究。结果表明:五台山气溶胶浓度总体呈冬春高、夏秋低的趋势,且冬春季节有较明显的日变化。气溶胶浓度与风速成正相关,当风向为偏北风时,气溶胶浓度较低。气溶胶浓度与气温并非简单的线性关系,存在温度阈值。降水对气溶胶粒子有明显的清除作用,相同条件下粒径>2.5μm的气溶胶粒子清除作用更好。

Based on the aerosol concentration data from Mount Wutai Atmospheric Composition Station and the conventional ground observation data from Mount Wutai Station,a correlation analysis was conducted to study the daily and annual variation characteristics of PM_(10) and PM_(2.5) in Mount Wutai and their relationships with meteorological factors.The results showed that the aerosol concentration in Mount Wutai was generally high in winter and spring and low in summer and autumn.Significant diurnal variations were observed in the winter and spring seasons.The concentration of aerosols was positively correlated with wind speed,and when northerly winds prevailed,the concentration of aerosols was lower.The relationship between aerosol concentration and temperature was not a simple linear one,as there exists a temperature threshold.Precipitation had a significant scavenging effect on aerosol particles,with better removal efficiency for particles larger than 2.5μm under the same conditions.