中文关键词气溶胶光学厚度Ångström波长指数单次散射反照率气溶胶粒子谱杭州地区 英文关键词aerosol optical depthÅngström exponentsingle scattering albedoaerosol size distributionHangzhou region

作者	单位	E-mail
齐冰	杭州市气象局, 杭州 310051 中国气象局大气化学重点开放实验室, 北京 100081	bill_129@sina.com
车慧正	中国气象科学研究院, 北京 100081	chehz@cma.gov.cn
徐婷婷	上海宝钢工业技术服务有限公司, 上海 201900
杜荣光	杭州市气象局, 杭州 310051
胡德云	杭州市气象局, 杭州 310051
梁卓然	杭州市气象局, 杭州 310051
马千里	临安区域大气本底站, 临安 311307
姚杰	临安区域大气本底站, 临安 311307

中文摘要 利用2012年杭州、桐庐、建德、淳安CE-318太阳光度计的观测资料，反演获得了气溶胶光学厚度（AOD）、Ångström波长指数（AE）、单次散射反照率（SSA）和气溶胶粒子谱（ASD）等参数，分析了杭州地区气溶胶光学特性的变化规律.结果表明，2012年杭州、桐庐、建德、淳安AOD_440nm年均值分别为0.94±0.16、0.84±0.17、0.82±0.22、0.71±0.20，呈现出自东北向西南逐渐下降的变化趋势，是长三角地区AOD高值地区之一.AE_440-870nm年均值分别为1.24±0.12、1.19±0.17、1.06±0.04、1.04±0.10，表明杭州地区以半径较小的气溶胶粒子为主控模态.3~4月AE相对偏低与来自北方的沙尘粒子远距离输送有关.除淳安外，杭州、桐庐和建德AOD有明显的日变化特征.不同地区细模态粒子峰值半径春季、秋季和冬季均在0.15 μm左右，由于气溶胶粒子的吸湿增加导致夏季细模态粒子的峰值半径在0.25 μm左右；粗模态粒子峰值半径夏季、秋季和冬季均在2.94 μm左右，高于春季（1.7~2.2 μm）.SSA_440nm年均值分别为0.91±0.01、0.92±0.03、0.92±0.02、0.93±0.02，说明杭州地区气溶胶粒子为中等强度吸收性气溶胶.对气溶胶类型进行分类表明，杭州以生物质燃烧/城市工业型为主，而桐庐、建德和淳安以混合型为主. 英文摘要 To investigate the optical properties of aerosols in the Hangzhou region (Hangzhou, Tonglu, Jiande, and Chun'an), the aerosol optical depth (AOD), Ångström exponent (AE), single scattering albedo (SSA), and aerosol size distribution (ASD) were measured using CIMEL sun-photometers in 2012. The results showed that the annual average values of AOD_440nm in Hangzhou, Tonglu, Jiande, and Chun'an were 0.94±0.16, 0.84±0.17, 0.82±0.22, and 0.71±0.20, respectively. The values generally decreased from the northeast to the southwest, and represented one of highest AOD districts in the Yangtze River Delta, China. The annual average values of AE_440-870nm were 1.24±0.12, 1.19±0.17, 1.06±0.04, and 1.04±0.10, respectively, indicating that particles with small average effective radii were predominant. The relatively lower AE values in March and April were generally attributed to the long-range transport of dust aerosols from Northwest China. Obvious diurnal variations in the AOD were found in Hangzhou, Tonglu, and Jiande, but not in Chun'an. An average fine-mode effective radius of~0.15 μm was observed in spring, autumn, and winter, while a value of~0.25 μm was observed in summer, in conjunction with aerosol hygroscopic growth. An average coarse-mode effective radius of~2.94 μm was observed in summer, autumn, and winter, which was higher than the value in spring. The annual average values of SSA_440nm were 0.91±0.01, 0.92±0.03, 0.92±0.02, 0.93±0.02, respectively, indicating that the particles had relatively strong to moderate absorption. Characterization of the aerosol types showed the predominance of biomass burning and urban industrial type aerosols in Hangzhou, while mixed type aerosols were observed in Tonglu, Jiande, and Chun'an.

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