GSTDTAP  > 地球科学
DOI10.1016/j.atmosres.2017.11.027
Investigating the size, shape and surface roughness dependence of polarization lidars with light-scattering computations on real mineral dust particles: Application to dust particles' external mixtures and dust mass concentration retrievals
Mehri, Tahar1; Kemppinen, Osku2,3; David, Gregory1,4; Lindqvist, Hannakaisa2; Tyynela, Jani2; Nousiainen, Timo2; Rairoux, Patrick1; Miffre, Alain1
2018-05-01
发表期刊ATMOSPHERIC RESEARCH
ISSN0169-8095
EISSN1873-2895
出版年2018
卷号203页码:44-61
文章类型Article
语种英语
国家France; Finland; USA; Switzerland
英文摘要

Our understanding of the contribution of mineral dust to the Earth's radiative budget is limited by the complexity of these particles, which present a wide range of sizes, are highly-irregularly shaped, and are present in the atmosphere in the form of particle mixtures. To address the spatial distribution of mineral dust and atmospheric dust mass concentrations, polarization lidars are nowadays frequently used, with partitioning algorithms allowing to discern the contribution of mineral dust in two or three-component particle external mixtures. In this paper, we investigate the dependence of the retrieved dust backscattering (beta(d)) vertical profiles with the dust particle size and shape. For that, new light-scattering numerical simulations are performed on real atmospheric mineral dust particles, having determined mineralogy (CAL, DOL, AGG, SIL), derived from stereogrammetry (stereo-particles), with potential surface roughness, which are compared to the widely-used spheroidal mathematical shape model. For each dust shape model (smooth stereo-particles, rough stereo-particles, spheroids), the dust depolarization, backscattering Angstrom exponent, lidar ratio are computed for two size distributions representative of mineral dust after long-range transport. As an output, two Saharan dust outbreaks involving mineral dust in two, then three-component particle mixtures are studied with Lyon (France) UV-VIS polarization lidar. If the dust size matters most, under certain circumstances, beta(d) can vary by approximately 67% when real dust stereo-particles are used instead of spheroids, corresponding to variations in the dust backscattering coefficient as large as 2 Mm(-1).sr(-1). Moreover, the influence of surface roughness in polarization lidar retrievals is for the first time discussed. Finally, dust mass-extinction conversion factors (eta(d)) are evaluated for each assigned shape model and dust mass concentrations are retrieved from polarization lidar measurements. From spheroids to stereo-particles, eta(d) increases by about 30%. We believe these results may be useful for our understanding of the spatial distribution of mineral dust contained in an aerosol external mixture and to better quantify dust mass concentrations from polarization lidar experiments.


英文关键词Mineral dust Surface roughness Mass concentrations Polarization lidar Light-scattering numerical simulations
领域地球科学
收录类别SCI-E
WOS记录号WOS:000426226400005
WOS关键词DISCRETE-DIPOLE APPROXIMATION ; SAHARAN DUST ; OPTICAL-PROPERTIES ; RAMAN LIDAR ; T-MATRIX ; MODEL PARTICLES ; MIXING STATE ; VOLCANIC ASH ; CAPE-VERDE ; SAMUM 2006
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/38391
专题地球科学
作者单位1.Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, Inst Lumiere Mat, F-69622 Villeurbanne, France;
2.Finnish Meterol Inst, Erik Palmenin Aukio 1, FI-700560 Helsinki, Finland;
3.Kansas State Univ, 1228 N 17th St, Manhattan, KS 66506 USA;
4.Swiss Fed Inst Technol, LPC, Zurich, Switzerland
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Mehri, Tahar,Kemppinen, Osku,David, Gregory,et al. Investigating the size, shape and surface roughness dependence of polarization lidars with light-scattering computations on real mineral dust particles: Application to dust particles' external mixtures and dust mass concentration retrievals[J]. ATMOSPHERIC RESEARCH,2018,203:44-61.
APA Mehri, Tahar.,Kemppinen, Osku.,David, Gregory.,Lindqvist, Hannakaisa.,Tyynela, Jani.,...&Miffre, Alain.(2018).Investigating the size, shape and surface roughness dependence of polarization lidars with light-scattering computations on real mineral dust particles: Application to dust particles' external mixtures and dust mass concentration retrievals.ATMOSPHERIC RESEARCH,203,44-61.
MLA Mehri, Tahar,et al."Investigating the size, shape and surface roughness dependence of polarization lidars with light-scattering computations on real mineral dust particles: Application to dust particles' external mixtures and dust mass concentration retrievals".ATMOSPHERIC RESEARCH 203(2018):44-61.
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