發(fā)布時間：2018-05-07 16:41

  本文選題：大氣光學 + 強迫估算��； 參考：《光學學報》2017年02期

【摘要】：基于擴散限制凝聚模型仿真生成了黑碳團簇粒子和具備核-殼結構(核為黑碳團簇,殼為包覆水層)的混合態(tài)粒子,并模擬了黑碳團簇粒子的老化過程,利用團簇T矩陣方法計算并研究了粒子形態(tài)結構和包覆水層對兩種粒子在550nm波長處的光學特性。分析表明,新生黑碳團簇粒子的光學特性參數(shù)與等體積球形黑碳粒子之間的差異最大,當分形維數(shù)Df為1.8時,散射截面和單次散射反照率的相對偏差分別達到61.58%和49.44%,隨著黑碳團簇粒子的老化,差異逐漸減小。對于混合態(tài)粒子,忽略黑碳核的團簇結構會導致前向散射強度、散射截面、消光截面、單次散射反照率、不對稱因子和F_(34)/F_(11)被低估,導致后向散射強度、吸收截面、-F_(12)/F_(11)、F_(33)/F_(11)、F_(44)/F_(11)被高估;包覆水層厚度的增加會加劇混合態(tài)粒子散射矩陣中元素隨散射角的振蕩程度,且忽略黑碳核或球形黑碳核假設所引起的光學特性參數(shù)相對偏差呈逐漸減小的趨勢。該工作有助于進一步減小黑碳氣溶膠輻射強迫估算誤差。
[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.
【作者單位】： 信陽職業(yè)技術學院數(shù)學與計算機學院;中國科學院遙感與數(shù)字地球研究所遙感科學國家重點實驗室;河南大學計算機與信息工程學院;
【基金】：國家自然科學基金(41501373,41571417)
【分類號】：X513;P422

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