气候变化领域集成服务门户(CCPortal): Single-scattering properties of ellipsoidal dust aerosols constrained by measured dust shape distributions

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DOI	10.5194/acp-23-2557-2023
	Single-scattering properties of ellipsoidal dust aerosols constrained by measured dust shape distributions
	Huang, Yue; Kok, Jasper F.; Saito, Masanori; Munoz, Olga
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2557
结束页码	2577
卷号	23 期号:4 页码:21
英文摘要	Most global aerosol models approximate dust as spherical particles, whereas most remote sensing retrieval algorithms approximate dust as spheroidal particles with a shape distribution that conflicts with mea-surements. These inconsistent and inaccurate shape assumptions generate biases in dust single-scattering proper-ties. Here, we obtain dust single-scattering properties by approximating dust as triaxial ellipsoidal particles with observationally constrained shape distributions. We find that, relative to the ellipsoidal dust optics obtained here, the spherical dust optics used in most aerosol models underestimate dust single-scattering albedo, mass extinc-tion efficiency, and asymmetry parameter for almost all dust sizes in both the shortwave and longwave spectra. We further find that the ellipsoidal dust optics are in substantially better agreement with observations of the scattering matrix and linear depolarization ratio than the spheroidal dust optics used in most retrieval algorithms. However, relative to observations, the ellipsoidal dust optics overestimate the lidar ratio by underestimating the backscattering intensity by a factor of similar to 2. This occurs largely because the computational method used to simulate ellipsoidal dust optics (i.e., the improved geometric optics method) underestimates the backscattering intensity by a factor of similar to 2 relative to other computational methods (e.g., the physical geometric optics method). We conclude that the ellipsoidal dust optics with observationally constrained shape distributions can help im-prove global aerosol models and possibly remote sensing retrieval algorithms that do not use the backscattering signal.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000937273400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273904
作者单位	University of California System; University of California Los Angeles; Texas A&M University System; Texas A&M University College Station; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Instituto de Astrofisica de Andalucia (IAA); Columbia University; National Aeronautics & Space Administration (NASA)
推荐引用方式 GB/T 7714	Huang, Yue,Kok, Jasper F.,Saito, Masanori,et al. Single-scattering properties of ellipsoidal dust aerosols constrained by measured dust shape distributions[J],2023,23(4):21.
APA	Huang, Yue,Kok, Jasper F.,Saito, Masanori,&Munoz, Olga.(2023).Single-scattering properties of ellipsoidal dust aerosols constrained by measured dust shape distributions.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(4),21.
MLA	Huang, Yue,et al."Single-scattering properties of ellipsoidal dust aerosols constrained by measured dust shape distributions".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.4(2023):21.