Study on the influence of black carbon aerosol on photolysis coefficient in northern suburb of Nanjing
Lü Huan1, AN Jun-lin1, SU Xiao-qian1, ZHU Bin1,2, SHI Shuang-shuang1,2
1. Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Nanjing University of Information Science & Technology, Nanjing 210044, China
The optical depth of black carbon (AODBC) was calculated by Mie scatteringtheory and vertical observation data of black carbon aerosol (BC) in Nanjing in June 2018 and October 2017, which was taken as the input parameters of Tropospheric Ultraviolet and Visible radiation model (TUV) to studyeffect of BC on the diurnal and vertical variations of photolysis frequencies (J[O1D] and J[NO2]). At 12:00 noon, the diurnal variation of photolysis frequencies had one peaking on the ground, but the attenuation of photolysis frequencies by black carbon(BC) were minimal.Then the maximum attenuation of J[O1D] and J[NO2] were-13.7% and -19.0% at 6:00 and 18:00. The relationshipbetween AODBC and photolysis frequencies was nonlinear, and the attenuation ability of BC to photolysis frequencies decreasedwith the increase of AODBC. When the value of solar zenith angle was 0°, photolysis frequencies were most sensitive to AODBC. In the boundary layer (0~1km), photolysis frequencies had a positive linear relationship with height, which was closely related to vertical variation of ultraviolet radiation, and the correlation coefficient (R)between it and photolysis frequencies was as high as 0.99. The attenuation degree of BC on photolysis frequencies increased with the decrease of height, but the vertical variation of it was very small and the maximum value of anomaly was only 0.1%.
吕欢, 安俊琳, 苏筱倩, 朱彬, 施双双. 南京北郊地区黑碳气溶胶对光解系数的影响[J]. 中国环境科学, 2020, 40(4): 1421-1428.
Lü Huan, AN Jun-lin, SU Xiao-qian, ZHU Bin, SHI Shuang-shuang. Study on the influence of black carbon aerosol on photolysis coefficient in northern suburb of Nanjing. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1421-1428.
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