Long-term observations of aerosol optical properties at Wuhan, an urban site in Central China
Long-term observations of aerosol optical properties at Wuhan, an urban site in Central China
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DOI：
10.1016/j.atmosenv.2014.11.021
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发表时间：
2015
影响因子：
5
通讯作者：
Lunche Wang;W. Gong;X. Xia;Jun Zhu;Jun Li;Zhongmin Zhu
中科院分区：
文献类型：
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作者：
Lunche Wang;W. Gong;X. Xia;Jun Zhu;Jun Li;Zhongmin Zhu
利用CIMEL太阳光度计2007-2013年的观测数据，研究了武汉市大气气溶胶光学厚度（AOD）、单次散射指数（SSA）、气溶胶粒径分布和折射率等气溶胶光学特性。AOD 500 nmis全年较高，最高值出现在2012年6月（1.52），最低值出现在2012年11月（0.57）; α值呈现明显的月变化，最高值出现在2010年6月（1.71），最低值出现在2012年4月（0.78）。AOD和α频率的分析表明，该区域充满了精细模式粒子。总粒子、细粒子和粗粒子SSA的月变化与气溶胶吸湿增长、化石燃料和生物质燃烧密切相关。不同季节气溶胶体积谱（双峰型）的粒子半径存在明显差异，细粒子半径从春季到夏季逐渐增大，其中3月份的最大值在0.15 μm左右，而6月份的最大值在0.25 μm左右。最后，对复折射率的真实的和虚部进行了逐月统计分析，发现春季和秋季复折射率的平均值最高，分别为真实的（1.50）和虚部（0.0395），波长范围为440-1020 nm。
Aerosol optical properties including aerosol optical depth (AOD), Ångström exponent (α), single scattering albedo (SSA), aerosol size distribution and refractive index at urban Wuhan in Central China are investigated based on the measurements from a CIMEL sun-photometer during 2007–2013. AOD500 nmis found to be relatively high all year round and the highest value 1.52 occurs in June 2012 and the lowest (0.57) in November 2012.αshows a significant monthly variation, with the highest value in June 2010 (1.71) and the lowest value (0.78) in April 2012. Analysis of AOD andαfrequencies indicate that this region is populated with fine-mode particles. Monthly variations of SSA for total, fine and coarse-mode particles are closely related to the aerosol hygroscopic growth, fossil fuel and biomass burning. The aerosol volume size distributions (bi-modal pattern) show distinct differences in particle radius for different seasons, the radius for fine-mode particles generally increase from spring to summer month, for example, the highest peak is around radius 0.15 μm in March, while the peak radius is around 0.25 μm in June. Finally, monthly statistics of real and imaginary parts of the complex refractive index are analyzed, the highest averages of real (1.50) and imaginary parts (0.0395) are found in spring and autumn, respectively at wavelength 440–1020 nm.