| 气溶胶散射相函数的单站观测研究 |
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| 引用本文： | 张霖逸,颜鹏,毛节泰,张骁,田平,畅海如.气溶胶散射相函数的单站观测研究[J].应用气象学报,2017,28(4):436-446. |
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| 作者姓名： | 张霖逸 颜鹏 毛节泰 张骁 田平 畅海如 |
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| 作者单位： | 1.中国气象科学研究院, 北京 100081 |
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| 基金项目： | 国家自然科学基金重点项目（41330422），科技部科技基础性工作专项（2013FY112500） |
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| 摘 要： | 利用2014年夏季在河北饶阳开展的“华北区域光化学立体试验”观测得到气溶胶辐射特性，根据三波长角散射浊度仪Aurora 4000测量获取的前向角散射系数（10°~90°）和后向散射系数，提出了一种基于浊度仪直接测量的气溶胶角散射系数和改进的HG相函数近似获取气溶胶散射相函数、不对称因子的拟合估算方法。分析了2014年6月16日—8月18日夏季观测试验期间河北饶阳地区大气气溶胶细粒子（PM2.5）在635 nm，525 nm，450 nm 3个波段的不对称因子、相函数等的变化特征。结果表明:用改进的HG相函数近似能够较好地拟合河北饶阳实际观测的PM2.5的气溶胶散射相函数。拟合得到河北饶阳地区观测期间干气溶胶细粒子在3个波段的平均不对称因子（g）分别为0.53±0.04（635 nm），0.57±0.05（525 nm）和0.57±0.07（450 nm）。
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| 关 键 词： | 气溶胶 辐射特性 不对称因子 散射相函数 |
| 收稿时间： | 2017/4/1 0:00:00 |
| 修稿时间： | 2017/5/19 0:00:00 |
Observational Study on Aerosol Scattering Phase Function at Raoyang of Hebei, China |
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| Zhang Linyi,Yan Peng,Mao Jietai,Zhang Xiao,Tian Ping and Chang Hairu.Observational Study on Aerosol Scattering Phase Function at Raoyang of Hebei, China[J].Quarterly Journal of Applied Meteorology,2017,28(4):436-446. |
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| Authors: | Zhang Linyi Yan Peng Mao Jietai Zhang Xiao Tian Ping and Chang Hairu |
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| Affiliation: | 1.Chinese Academy Meteorological Sciences, Beijing 1000812.Meteorological Observation Center, Beijing 1000813.School of Physics, Peking University, Beijing 1008714.Beijing Meteorological Bureau, Beijing 100089 |
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| Abstract: | Aerosol radiative properties are key factors in the process of aerosol radiative forcing calculation. The scattering phase function and asymmetry factor facilitate the illustration of the direction of radiative transfer and the estimation of parameters in remote sensing.In the early summer of 2014, aerosol radiative parameters are obtained at Raoyang Meteorology Administration (an agricultural district) with a latest three-wavelength polar nephelometers (Aurora 4000) developed by EcoTech, Australia. Compared with the previous model, the instrument is unique in that it can measure the volume scattering coefficient from Θ through to 170° degrees and Θ is 10°, 15°, …, 90°. Based on the volume scattering coefficient, the scattering phase function can be computed with the traditional formula between them. What's more, one improved approach is proposed to calculate the asymmetry factor with the combination of scattering phase function and backscattering ratio. The backscattering ratio used can be calculated from the backscattering coefficient and total scattering coefficient as defined. Aerosol radiative properties of PM2.5 including calculated scattering phase function and the fitted asymmetry factor are presented during the observation between 16 June and 18 August in 2014. The result suggests that the improved HG aerosol particle phase function can fit the aerosol scattering phase function observed at Raoyang Meteorology Administration of Hebei well. Observed results of forward scattering phase function (15°-20°) and the backscattering ratio are all in good agreement with the numerical results. The average asymmetry factors at the wavelength of 635 nm, 525 nm and 450 nm are 0.53, 0.57 and 0.57, respectively, with no significant difference possibly due to the size distribution of aerosol. The value of it at 525 nm are accordant with analysis of previous experiments, which indicate the asymmetry factor of dry aerosol are in the range of 0.55 and 0.63 (550 nm). Two examples of different pollution status (dirty period and clean one) are chosen, depending on the scattering coefficient, and the radiative properties are different. During two dirty periods, values of asymmetry factor are between 0.55 and 0.63, which is larger than those in clean periods. For asymmetry factor, mean values at 635 nm, 525 nm and 450 nm wavelength are in the range of 0.51-0.53, 0.54, 0.54, respectively. Such results provide more details and supports for further study of radiative effects of aerosol. |
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| Keywords: | aerosol radiative property asymmetry factor scattering phase function |
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