气溶胶消光系数与质量浓度的相关性研究

Study on Relationship between Extinction Coefficient and Mass Concentration

为了利用激光雷达探测的消光系数垂直分布来反演气溶胶质量浓度的垂直分布,研究气溶胶消光系数与质量浓度之间的关系就显得十分重要。根据Mie散射理论,分析了气溶胶的质量消光系数、消光系数和质量浓度之间的关系,引进了等效参数,分析了Junge指数对等效参数的影响,用实际测量的粒子谱分布、能见度、相对湿度和气溶胶质量浓度验证了气溶胶消光系数和质量浓度之间的关系。这对利用激光雷达测量的气溶胶消光系数垂直分布来反演气溶胶质量浓度的垂直分布是很有实用价值和指导意义的。

Retrieving the vertical distribution of aerosol mass concentration by detecting the vertical distribution of extinction coefficient with lidar is important in environment monitoring. It is indispensable to establish the relationship between extinction coefficient and mass concentration. The relation of mass extinction coefficient, extinction coefficient and mass concentration is analyzed based on the Mie scattering theory, an equivalent parameter is introduced and the effect of Junge index on the equivalent parameter is discussed. The relationship between aerosd extinction coefficient and mass concentration is validated by measured particles spectrum distribution, visibility, relative humidity and aerosol mass concentration in Beijing, which is significantive for retrieving aerosol mass concentration with lidar.