DOI: 10.1002/2017JD027869
Scopus记录号: 2-s2.0-85040682457
论文题名: Optical Modeling of Sea Salt Aerosols: The Effects of Nonsphericity and Inhomogeneity
作者: Bi L. ; Lin W. ; Wang Z. ; Tang X. ; Zhang X. ; Yi B.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 543
结束页码: 558
语种: 英语
英文关键词: aerosols
; depolarization
; light scattering
; sea salts
Scopus关键词: aerosol
; aerosol property
; aspect
; geometry
; inhomogeneity
; lidar
; modeling
; optical method
; optical property
; relative humidity
; sea salt
; simulation
; sodium chloride
英文摘要: The nonsphericity and inhomogeneity of marine aerosols (sea salts) have not been addressed in pertinent radiative transfer calculations and remote sensing studies. This study investigates the optical properties of nonspherical and inhomogeneous sea salts using invariant imbedding T-matrix simulations. Dry sea salt aerosols are modeled based on superellipsoidal geometries with a prescribed aspect ratio and roundness parameter. Wet sea salt particles are modeled as coated superellipsoids, as spherical particles with a superellipsoidal core, and as homogeneous spheres depending on the level of relative humidity. Aspect ratio and roundness parameters are found to be critical to interpreting the linear depolarization ratios (LDRs) of NaCl crystals from laboratory measurements. The optimal morphology parameters of NaCl necessary to reproduce the measurements are found to be consistent with data gleaned from an electron micrograph. The LDRs of wet sea salts are computed based on inhomogeneous models and compared with the measured data from ground-based LiDAR. The dependence of the LDR on relative humidity is explicitly considered. The increase in the LDR with relative humidity at the initial phase of deliquescence is attributed to both the size increase and the inhomogeneity effect. For large humidity values, the LDR substantially decreases because the overall particle shape becomes more spherical and the inhomogeneity effect in a particle on the LDR is suppressed for submicron sea salts. However, the effect of inhomogeneity on optical properties is pronounced for coarse-mode sea salts. These findings have important implications for atmospheric radiative transfer and remote sensing involving sea salt aerosols. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114695
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, Zhejiang University, Hangzhou, China; School of Earth Sciences, Zhejiang University, Hangzhou, China; School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China
Recommended Citation:
Bi L.,Lin W.,Wang Z.,et al. Optical Modeling of Sea Salt Aerosols: The Effects of Nonsphericity and Inhomogeneity[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)