中国不同城市AERONET站点气溶胶光学特性的统计研究

论文总字数：20930字

目 录

引言 4

1.站点分布及数据来源 6

2.观测仪器及反演算法介绍 7

2.1观测仪器的结构和性能介绍 7

2.2气溶胶光学厚度与Angstrom波长指数的反演 8

3.数据处理 9

4.大气气溶胶光学厚度(AOD)和Angstrom波长指数(AE)的变化特征 10

4.1 500nm大气气溶胶光学厚度和Angstrom 波长指数的月变化 12

4.2 大气气溶胶光学厚度和Angstrom波长指数间的关系 14

4.3 500nm大气气溶胶光学厚度和Angstrom波长指数的频率分布 16

5.大气气溶胶单次散射比(SSA)变化特征 18

5.1 大气气溶胶SSA的月变化 18

5.2大气气溶胶SSA的频率分布 19

6.不同地区复折射指数实部和虚部比较 20

7.大气气溶胶粒子体积谱分布的变化特征 22

8.结论 23

参考文献 24

致谢 26

中国不同城市AERONET站点气溶胶光学特性的统计研究

程锦

, China

Abstract: The Angstrom wavelength index (AE), atmospheric aerosol optical thickness (AOD) and single scattering ratio (SSA) were retrieved from measured data from four AERONET stations in Hong Kong, Lanzhou, Taihu and Xianghe, China. The optical properties of aerosols such as real and imaginary parts of the complex index of refraction are studied, and the temporal and spatial variations of aerosol optical properties in different regions are studied. The AOD in all four regions decreases with increasing wavelength. The AODs at 500 nm in Hong Kong, Lanzhou, Taihu and Xianghe were 0.48, 0.36, 0.73, and 0.50, respectively. The AOD at Taihu Station was obviously higher than that in the other three regions, and the AOD in Lanzhou was lower than the other three regions. The AEs at Hong Kong, Lanzhou, Taihu and Xianghe were 1.36, 0.86, 1.09, and 1.16 in the 440-870 nm band, and the AEs in Lanzhou were lower than the other three regions, indicating that the proportion of coarse-modal aerosols in Lanzhou was relatively high. . The AOD of the four regions showed higher characteristics in spring or summer and lower in autumn or winter. Hong Kong is mainly affected by fine-modal aerosols; Lanzhou is more affected by coarse-modal aerosols; Taihu Lake has a greater influence of fine-modal aerosols after entering the summer; Xianghe is a fine-scale aerosol outside the summer. Aerosols play an important role. The SSAs at Hong Kong, Lanzhou, Taihu and Xianghe were 0.97, 0.89, 0.91, and 0.86 at 440 nm, respectively. Hong Kong's SSA was significantly higher than the other three regions, indicating that Hong Kong's atmospheric aerosols have high scattering and weak absorption. The SSA in the Xianghe area is lower than that in the other three areas, indicating that the aerosol particles in the Xianghe area are more absorptive than the aerosol particles in the other three areas, and the scattering properties are relatively weak. The imaginary part of the lower birefringence index of aerosols in Hong Kong corresponds to the higher SSA, while the imaginary part of the higher birefringence index of aerosols in the Xianghe area corresponds to the lower SSA, which is the same as the previous result. The spring aerosols in the four regions are mainly coarse-modal aerosols due to dusty weather, and are mainly fine-modal aerosols in summer because of the decrease in dusty weather events and the large amount of atmospheric coarse-modal aerosols. Precipitation increases are cleared.

Key words: Angstrom wavelength index; aerosol optical thickness; complex refractive index; single scattering ratio

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