黑碳团簇及具有包覆水层混合态粒子的光学特性

发布时间：2018-05-07 16:41

本文选题：大气光学 + 强迫估算　；参考：《光学学报》2017年02期

【摘要】：基于扩散限制凝聚模型仿真生成了黑碳团簇粒子和具备核-壳结构(核为黑碳团簇,壳为包覆水层)的混合态粒子,并模拟了黑碳团簇粒子的老化过程,利用团簇T矩阵方法计算并研究了粒子形态结构和包覆水层对两种粒子在550nm波长处的光学特性。分析表明,新生黑碳团簇粒子的光学特性参数与等体积球形黑碳粒子之间的差异最大,当分形维数Df为1.8时,散射截面和单次散射反照率的相对偏差分别达到61.58%和49.44%,随着黑碳团簇粒子的老化,差异逐渐减小。对于混合态粒子,忽略黑碳核的团簇结构会导致前向散射强度、散射截面、消光截面、单次散射反照率、不对称因子和F_(34)/F_(11)被低估,导致后向散射强度、吸收截面、-F_(12)/F_(11)、F_(33)/F_(11)、F_(44)/F_(11)被高估;包覆水层厚度的增加会加剧混合态粒子散射矩阵中元素随散射角的振荡程度,且忽略黑碳核或球形黑碳核假设所引起的光学特性参数相对偏差呈逐渐减小的趋势。该工作有助于进一步减小黑碳气溶胶辐射强迫估算误差。
[Abstract]:Black carbon cluster particles and mixed particles with core-shell structure (core is black carbon cluster and shell is covered with water layer) are simulated based on diffusion-limited condensation model. The aging process of black carbon cluster particles is simulated. The optical properties of two kinds of particles at 550nm wavelength were calculated and studied by cluster T matrix method. The results show that the difference between the optical properties of the new black carbon cluster particles and the spherical black carbon particles of equal volume is the greatest, when the fractal dimension DF is 1.8, The relative deviations of scattering cross section and single scattering albedo are 61.58% and 49.44% respectively. The difference decreases with the aging of black carbon cluster particles. For mixed particles, ignoring the cluster structure of the black carbon nucleus leads to an underestimation of the forward scattering intensity, the scattering cross section, the extinction cross section, the single incident, the asymmetry factor and the FN 34 / F / FJ / FJ 11), which leads to the overestimation of the backward scattering intensity, the absorption cross-section, and the absorption cross-section, which leads to the overestimation of the forward scattering intensity, the scattering cross-section, the single field, the asymmetry factor and the FN / F / FJ / FJ / 11). The increase of the thickness of the coated water layer will aggravate the oscillation degree of the elements in the scattering matrix of mixed particles with the scattering angle, and the relative deviation of the optical characteristic parameters caused by the assumption of black carbon nucleus or spherical black carbon nucleus will decrease gradually. This work is helpful to further reduce the estimation error of black carbon aerosol radiation forcing.
【作者单位】：信阳职业技术学院数学与计算机学院;中国科学院遥感与数字地球研究所遥感科学国家重点实验室;河南大学计算机与信息工程学院;
【基金】：国家自然科学基金(41501373,41571417)
【分类号】：X513;P422

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