非球形氣溶膠粒子散射特性及其等效Mie散射誤差分析

doi:10.3969/2013jms.0073

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非球形氣溶膠粒子散射特性及其等效Mie散射誤差分析
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                        10.3969/2013jms.0073
                    
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基金項目:國家自然科學(xué)基金資助項目(41205125)

Analysis on scattering characeristics and equivalent Mie scattering errors of non-spherical atmospherical aerosols

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為分析形狀對氣溶膠粒子散射特性的影響,采用T矩陣法計算了0.633 μm波段(自然光)不同種類、形狀的氣溶膠單粒子與體散射的散射相函數(shù),并討論了氣溶膠粒子形狀畸變與等效Mie散射誤差的變化規(guī)律.結(jié)果表明:粒子形狀畸變對氣溶膠粒子散射能量空間分布影響較大.對于單粒子,各散射角上的等效Mie散射誤差并不隨粒子形狀畸變程度單調(diào)變化.從相對誤差量級上看,形狀畸變對180°散射的影響強于0°,對35°的散射影響相對較弱.對于兩種非球形粒子等效方法,等表面積法優(yōu)于等體積法.不同類型的非球形氣溶膠粒子體散射存在顯著差異,沙塵性與海洋性的等效Mie散射誤差明顯大于煤煙性與可溶性粒子;對于同一種氣溶膠,形狀的改變對側(cè)向與后向散射影響顯著,對前向散射影響不大.

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To analyze the influence of shape deformation on the scattering property of atmospherical aerosols, T-Martrix method is used to calculate the scattering phase functions of particles with different types and shapes at a wavelength of 633 nm(unpolarized light). In addition, the variation law between shape deformation and equivalent Mie scattering error is also discussed in this paper. Result shows that the shape deformation has great effects on the space distribution of seattering energy; the relationship between equivalent Mie scattering error and shape deformation is more complex than that ever has assumed. The dynamic range of equivalent Mie scattering error found that shape deformation influences the scattering phase functions more at 0° than at 180°, while at 35°, the effect is small; for the sphere-equivalent methods, surface-area equivalent method is more applicable in calculating the scattering characteristics of non-spherical particles. A great discrepancy exists in volume scattering phase functions of aerosols with different physical characteristics. Equivalent Mie scattering errors of sand and maritime aerosols are bigger than those of smoke and dissolvable aerosols. For the volume scattering of particles of the same kind, shape deformation has significant influence on side and backforward scattering, but has little on the forward scattering.

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胡帥,高太長,劉磊.非球形氣溶膠粒子散射特性及其等效Mie散射誤差分析.氣象科學(xué),2014,34(6):612-619 HU Shuai, GAO Taichang, LIU Lei. Analysis on scattering characeristics and equivalent Mie scattering errors of non-spherical atmospherical aerosols. Journal of the Meteorological Sciences,2014,34(6):612-619

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收稿日期:2013-04-16
最后修改日期:2013-07-31
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