Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/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
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ISSN | 0169-8095 |
EISSN | 1873-2895 |
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 |
推荐引用方式 GB/T 7714 | 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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