Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jqsrt.2016.02.003 |
Laboratory investigations of mineral dust near-backscattering depolarization ratios | |
Jaervinen, E.1; Kemppinen, O.2; Nousiainen, T.2; Kociok, T.1; Moehler, O.1; Leisner, T.1; Schnaiter, M.1 | |
通讯作者 | Jaervinen, E. |
会议名称 | 15th Conference on Electromagnetic and Light Scattering (ELS) |
会议日期 | JUN 21-26, 2015 |
会议地点 | Leipzig, GERMANY |
英文摘要 | Recently, there has been increasing interest to derive the fractions of fine- and coarse mode dust particles from polarization lidar measurements. For this, assumptions of the backscattering properties of the complex dust particles have to be made either by using empirical data or particle models. Laboratory measurements of dust backscattering properties are important to validate the assumptions made in the lidar retrievals and to estimate their uncertainties. Here, we present laboratory measurements of linear and circular near-backscattering (178) depolarization ratios of over 200 dust samples measured at 488 and 552 nm wavelengths. The measured linear depolarization ratios ranged from 0.03 to 0.36 and were strongly dependent on the particle size. The strongest size dependence was observed for fine-mode particles as their depolarization ratios increased almost linearly with particle median diameter from 0.03 to 0.3, whereas the coarse-mode particle depolarization values stayed rather constant with a mean linear depolarization ratio of 0.27. The depolarization ratios were found to be insensitive to the dust source region or thin coating of the particles or to changes in relative humidity. We compared the measurements with results of three different scattering models. With certain assumptions for model particle shape, all the models were capable of correctly describing the size dependence of the measured dust particle, albeit the model particles significantly differed in composition, shape and degree of complexity. Our results show potential for distinguishing the dust fine- and coarse-mode distributions based on their depolarization properties and, thus, can serve the lidar community as an empirical reference. (C) 2016 Elsevier Ltd. All rights reserved. |
英文关键词 | Light scattering Mineral dust Depolarization ratio Size distribution Model comparison Mirror symmetry |
来源出版物 | JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER |
ISSN | 0022-4073 |
EISSN | 1879-1352 |
出版年 | 2016 |
卷号 | 178 |
页码 | 192-208 |
出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | Germany;Finland |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000376705900019 |
WOS关键词 | ICE NUCLEATION PROPERTIES ; SAHARAN DUST ; POLARIZATION LIDAR ; NONSPHERICAL PARTICLES ; LIGHT-SCATTERING ; RAMAN LIDAR ; DESERT-DUST ; ELECTROMAGNETIC SCATTERING ; AEROSOL CLASSIFICATION ; OPTICAL-PROPERTIES |
WOS类目 | Optics ; Spectroscopy |
WOS研究方向 | Optics ; Spectroscopy |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/304629 |
作者单位 | 1.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, POB 3640, D-76021 Karlsruhe, Germany; 2.Finnish Meteorol Inst, Earth Observat, POB 503, FIN-00101 Helsinki, Finland |
推荐引用方式 GB/T 7714 | Jaervinen, E.,Kemppinen, O.,Nousiainen, T.,et al. Laboratory investigations of mineral dust near-backscattering depolarization ratios[C]:PERGAMON-ELSEVIER SCIENCE LTD,2016:192-208. |
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