本文選題：散射 + 沙塵氣溶膠��； 參考：《光學學報》2016年08期

【摘要】：利用離散偶極子近似法研究了旋轉橢球體沙塵氣溶膠粒子模型在尺度參數(shù)變化范圍為0.1~23時(波長0.55μm對應有效半徑為0.01~2μm)的線退偏比特性。通過分析比較不同軸半徑比時線退偏比特性的差別,研究了粒子非球形性程度對單分散和多分散沙塵氣溶膠粒子退偏比特性的影響。對單分散系,旋轉橢球體沙塵氣溶膠的線退偏比在瑞利散射區(qū)和米散射區(qū)隨散射角的變化有不同的分布特征;在瑞利散射區(qū),散射角分別為0°和180°的前后向散射方向,線退偏比較小,其值在1%的量級,而在散射角為90°附近的側向,線退偏比有最大值,可達100%;在米散射區(qū),線退偏比則無明顯的極值分布,但有明顯的后向增強;單分散沙塵粒子明顯的非球形性特征,會增加在瑞利散射區(qū)的線退偏比,但卻不會明顯增加米散射區(qū)的線退偏比。而對多分散系,除了出現(xiàn)線退偏比最大值的側向附近(80°~100°)之外,沙塵粒子非球形性特征越明顯,其線退偏比越大。
[Abstract]:Using the discrete dipole approximation method, the linear depolarization ratio of the rotating ellipsoid dust aerosol particle model is studied in the range of 0.1 ~ 23:00 (the effective radius of 0.55 渭 m is 0.01g ~ 2 渭 m). By analyzing and comparing the characteristics of depolarization ratio of different axial radius ratio, the influence of particle non-sphericity on the depolarization ratio of monodisperse aerosol and polydisperse aerosol was studied. For monodisperse system, the linear depolarization ratio of rotating ellipsoid dust aerosol varies with the scattering angle in the Rayleigh scattering region and the meter scattering region, and in the Rayleigh scattering region, the scattering angle is 0 擄and 180 擄, respectively. The line depolarization ratio is small, its value is in the order of 1%, but in the lateral direction near 90 擄, the line depolarization ratio has the maximum value (up to 100), and in the meter scattering area, the line depolarization ratio has no obvious extreme value distribution, but has obvious backward enhancement. The obvious non-spherical character of monodisperse dust particles will increase the line depolarization ratio in Rayleigh scattering region, but it will not obviously increase the line depolarization ratio in rice scattering region. For the polydisperse system, the more obvious the non-spherical character of dust particles is, the larger the line depolarization ratio is, except the lateral direction near the maximum line depolarization ratio (80 擄/ 100 擄).
【作者單位】： 南京信息工程大學大氣物理學院中國氣象局氣溶膠與云降水重點開放實驗室;
【基金】：國家自然科學基金(41505127,21406189) 江蘇省自然科學基金(BK20150901) 江蘇省高校自然科學研究面上項目(15KJB170009) 南京信息工程大學人才啟動經(jīng)費項目(2015r002,2014r011)
【分類號】：X513;O436
，

本文編號：1922221