Optical and radiative properties of coated black carbon during hygroscopic growth and retrieval errors of mixing state using single-particle soot photometer  

作　　者：Jia Liu Donghui Zhou Cancan Zhu Jinbao Han Bo Yin 

机构地区：[1]Non-destructive Testing Laboratory,School of Quality and Technical Supervision,Hebei University,Baoding,071002,China [2]Engineering Research Center of Zero-carbon Energy Buildings and Measurement Techniques,Ministry of Education,Hebei University,Baoding,071002,China [3]Hebei Key Laboratory of Energy Metering and Safety Testing Technology,Hebei University,Baoding,071002,China

出　　处：《Particuology》2025年第2期183-192,共10页颗粒学报(英文版)

基　　金：This research was supported by the National Natural Science Foundation of China(grant No.42305082);the Hebei Natural Science Foundation(grant No.D2024201001);the Science Research Project of the Hebei Education Department(grant No.BJK2024179);the China Postdoctoral Science Foundation(grant No.2024M750493);the Innovation Team of Nondestructive Testing Technology and Instrument,Hebei University(grant No.IT2023C03);the Interdisciplinary Research Program of Natural Science of Hebei University(grant No.DXK201915).

摘　　要：Under environment with various water contents,the variations in the mixing state and particle size of coated black carbon(BC)aerosols cause changes in optical and radiative effects.In this study,fractal models for thinly,partially,and thickly coated BC under six relative humidities(RHs=0–95%)are constructed and optically simulated at 1064 and 532 nm.Differential scattering cross-sections are selected to retrieve the mixing state(D_(p)/D_(c))of BC to investigate the possible retrieval errors caused by the nonspherical morphology when using the single-particle soot photometer(SP2).Furthermore,the radiative forcing of BC aerosols at different RHs are analyzed.Results showed that the retrieval errors(REs)of D_(p)/D_(c) are negative for coated particles with BC volume fraction smaller than 0.10,indicating that the mixing states of coated fractal BC are underestimated during the hygroscopic growth.The partially-coated BC has the best retrieval accuracy of the mixing state,followed by the closed-cell and coated-aggregate model,judging from averaged REs.Radiative forcing enhancements for partially-coated aerosols with different BC volume fractions exponentially increase to opposite values,resulting in a warming or cooling effect.This study helps understand the uncertainties in Dp/Dc of BC aerosols retrieved by SP2 and their radiative forcing at different RHs.

关 键 词：BC aerosol Hygroscopic growth SP2 Mixing state Radiative forcing 

分 类 号：X513[环境科学与工程—环境工程]