光学 精密工程, 2020, 28 (5): 1021, 网络出版: 2020-11-06
中国部分地区的春季气溶胶光学特性
Optical properties of spring aerosol in typical areas of China
摘要
为了研究不同地区的气溶胶光学特性, 了解地区间气溶胶成分和来源的差异, 建立了典型地区的气溶胶光学模式。基于POM02太阳辐射计测量的太阳直射辐射和散射辐射值, 利用SKYRAD算法获得了青海德令哈、安徽合肥、广东茂名3个地区的春季气溶胶光学特性参数, 包括谱分布、折射指数和单次散射反照率等。然后基于这些参数对气溶胶来源和分布特征进行分析, 最后分析了浮尘天气对气溶胶光学参数的影响。结果表明: 德令哈地区大气清洁度较高, 24%的光学厚度分布在0.2以下, 气溶胶来源单一, 以大粒子为主导; 合肥地区有39%的波长指数分布在0.8~1.0之间, 折射率实部随波长变化不明显, 气溶胶来源复杂, 以小粒子为主导; 茂名地区54%的光学厚度集中在0.5左右, 分布区间稳定; 沙尘天气中, 大粒子的增加是气溶胶光学厚度增大的主要原因。
Abstract
The aim of this study is to determine aerosol optical characteristics in different regions, understand the differences in aerosol composition and source between regions, and establish a typical regional aerosol optical model. First, based on the direct and scattered solar radiation measured by POM02 solar radiometer and using skyrad algorithm, the aerosol optical parameters in spring in Delingha, Qinghai, Hefei, Anhui, and Maoming, Guangdong were obtained. These parameters include spectral distribution, refractive index, single scattering albedo, etc. Based on these parameters, the source and distribution characteristics of aerosols were analyzed. Likewise, the influence of dust weather on aerosol optical parameters was analyzed. The results show that the atmospheric cleanliness in Delingha area is high, 24% of optical thickness is distributed below 0.2, and the source of aerosol is single and dominated by large particles. Similarly, 39% of the wavelength index in Hefei area is distributed between 0.8—1.0, the real part of refractive index does not change significantly with wavelength, and the source of aerosol is complex and dominated by small particles. Finally, 54% of optical thickness in Maoming area is concentrated around 0.5, and the distribution area is complex stability. In dust weather, the increase of large particles is the main reason for the increase in aerosol optical thickness.
刘泽阳, 李学彬, 孙刚, 刘庆, 翁宁泉. 中国部分地区的春季气溶胶光学特性[J]. 光学 精密工程, 2020, 28(5): 1021. LIU Ze-yang, LI Xue-bin, SUN Gang, LIU Qing, WENG Ning-quan. Optical properties of spring aerosol in typical areas of China[J]. Optics and Precision Engineering, 2020, 28(5): 1021.