A study of aerosol optical properties during ozone pollution episodes in 2013 over Shanghai, China
A study of aerosol optical properties during ozone pollution episodes in 2013 over Shanghai, China
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2013年上海臭氧污染期间气溶胶光学特性研究
DOI：
10.1016/j.atmosres.2014.09.002
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发表时间：
2015-02
影响因子：
5.5
通讯作者：
Zhou Bin
中科院分区：
文献类型：
--
作者：
Shi Chanzhen;Wang Shanshan;Liu Rui;Zhou Rui;Li Donghui;Wang Wenxin;Li Zhengqiang;Cheng Tiantao;Zhou Bin
气溶胶光学特性对于对流层臭氧形成机制至关重要，但很少在富含臭氧的环境中进行测量以进行具体研究。利用太阳光度计的检索结果，对臭氧污染事件和清洁背景下的气溶胶光学深度（AOD）、单次散射反照率（SSA）和粒径分布进行了对比研究。与预期相反，发现气溶胶负荷与臭氧浓度呈正相关：臭氧事件中 500 nm 处的日平均 AOD（~ 0.78）比清洁天（~ 0.32）高 2.4 倍。大的 Ångström 指数 (~ 1.51) 以及大量的气溶胶负载表明细颗粒对消光有相当大的影响。这些参数的动态昼夜波动也暗示了气溶胶和光化学反应之间复杂的相互作用。在臭氧污染天和清洁天中都表现出气溶胶粒径谱的双峰对数正态分布模式。下午 3 点观察到精细模式（半径 < 0.6 μm）下出现最大体积浓度 (~ 0.28)。 （当地时间），臭氧大量产生。在高浓度臭氧环境下再现了气溶胶明显的散射特征。 SSA 往往从早上（440 nm 处约 0.91）到下午（约 0.99）持续增加，这可能与二次气溶胶的形成有关。散射气溶胶（具有中等高的气溶胶负载）可能通过增加边界层中的太阳通量而有利于臭氧的形成。利用微脉冲激光雷达 (MPL)，在臭氧污染期间发现了比清洁条件下（约 1.4 公里）更发达的行星边界层（PBL，顶部高度约 1.96 公里）。在几集中，最大消光比（~ 0.5 km−1）出现在下午晚些时候的 1.2 km 高度。探测得到的湿度剖面也显示出该高度的极值。这表明光消光主要归因于PBL中部的气溶胶，其中可能发生强烈的光化学反应和吸湿生长。
Aerosol optical property is essential to the tropospheric ozone formation mechanism while it was rarely measured in ozone-rich environment for a specific study. With the retrieved products of the sun-photometer, a comparative investigation was conducted on aerosol optical depth (AOD), single scattering albedo (SSA) and size distribution during ozone-polluted episodes and clean background. Contrary to expectations, aerosol loading was found to be positively-correlated with ozone concentration: daily averaged AOD at 500 nm in ozone episodes (~ 0.78) displayed 2.4 times higher than that in clean days (~ 0.32). Large Ångström exponent (~ 1.51) along with heavy aerosol loading indicated a considerable impact of fine particles on optical extinction. The dynamic diurnal fluctuation of these parameters also implied a complex interaction between aerosols and photo-chemical reactions. The bimodal lognormal distribution pattern for aerosol size spectra exhibited in both ozone-polluted and clean days. The occurrence of maximum volume concentration (~ 0.28) in fine mode (radius < 0.6 μm) was observed at 3 p.m. (local time), when ozone was substantially generated. Pronounced scattering feature of aerosol was reproduced in high-concentration ozone environment. SSA tended to increase continuously from morning (~ 0.91 at 440 nm) to afternoon (~ 0.99), which may be associated with secondary aerosol formation. The scattering aerosol (with moderately high aerosol loading) may favor the ozone formation through increasing solar flux in boundary layer. Utilizing the micro-pulse lidar (MPL), a more developed planet boundary layer (PBL, top height ~ 1.96 km) was discovered during ozone-polluted days than clean condition (~ 1.4 km). In episodes, the maximum extinction ratio (~ 0.5 km− 1) was presented at a height of 1.2 km in the late afternoon. The humidity profile by sounding also showed the extreme value at this altitude. It suggested that optical extinction was mainly attributed to the aerosol in middle PBL, where the intense photochemical reactions and hydroscopic growth may occur.
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