气溶胶谱分段拟合对能见度计算的影响  

Influence of segmental fitting of aerosol spectrum on visibility calculation

作　　者：庄子波[1] 杨晓婷 台宏达[3] ZHUANG Zibo;YANG Xiaoting;TAI Hongda(Flight Academy,Civil Aviation University of China,Tianjin 300300,China;College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Air Traffic Management College,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学飞行分校,天津300300 [2]中国民航大学安全科学与工程学院,天津300300 [3]中国民航大学空中交通管理学院,天津300300

出　　处：《大气与环境光学学报》2024年第3期301-313,共13页Journal of Atmospheric and Environmental Optics

基　　金：国家自然科学基金(41905129);天津市自然科学基金多元投入基金面上项目(21JCYBJC00740)。

摘　　要：针对气溶胶谱分布函数拟合中存在的偏差严重影响能见度计算精度的问题,提出了一种采用Junge谱与Deirmendjian谱结合的分段拟合方法来提高气溶胶谱分布函数的精度,并在大气环境模拟舱内进行了实验验证。首先,在大气模拟舱内生成了气溶胶多峰谱分布,建立了气溶胶谱分布的参数化模型。然后,对比分析了所提综合谱分段拟合方法和单一谱函数法拟合谱函数的相对误差和相关系数。最后,基于相对偏差和相关性评估了所提方法计算能见度的精度。结果表明利用所提方法计算获得的能见度与观测值的平均相对偏差为4.87%,相关性R^(2)=0.9847,证明其拟合结果具有较好的准确性、稳定性,且与实际观测值具有较好一致性。Aiming at the problem that the deviation in the fitting of aerosol spectrum distribution function can seriously affect the calculation and prediction of visibility,a segmental fitting method combining Junge spectrum and Deirmendjian spectrum was proposed to improve the fitting accuracy of aerosol spectrum distribution function,and its experimental verification was conducted in the atmospheric environment simulation chamber.Firstly,a multi-modal spectral distribution of aerosols is generated in the atmospheric simulation chamber,and a parametric model of aerosol spectral distribution is established.Then,the relative errors and correlation coefficients of the spectral functions fitted by the proposed method and the single spectral function method are compared and analyzed.Finally,the accuracy of the propsed method in calculating visibility is evaluated based on relative deviation and correlation.The results show that the average relative deviation between the visibility calculated using the proposed method and the observed value is 4.87%,with a correlation of R^(2)=0.9847,which verifies that the fitting results have good accuracy,stability and consistency with the observed visibility,and can provide a support for improving the accuracy of visibility calculation and prediction.

关 键 词：散射 分段拟合 气溶胶谱分布 数浓度 能见度 

分 类 号：O648.18[理学—物理化学] P412.17[理学—化学]