南京北郊地区黑碳气溶胶对光解系数的影响

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Abstract

The optical depth of black carbon (AOD_BC) 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 AOD_BC and photolysis frequencies was nonlinear, and the attenuation ability of BC to photolysis frequencies decreasedwith the increase of AOD_BC. When the value of solar zenith angle was 0°, photolysis frequencies were most sensitive to AOD_BC. 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%.

Key words： black carbon(BC) photolysis frequencies Tropospheric Ultraviolet and Visible radiation model(TUV) diurnal variation vertical variation

Received: 29 September 2019

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X513

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	Articles by authors
	Lü Huan
	AN Jun-lin
	SU Xiao-qian
	ZHU Bin
	SHI Shuang-shuang

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Lü Huan,AN Jun-lin,SU Xiao-qian等. Study on the influence of black carbon aerosol on photolysis coefficient in northern suburb of Nanjing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1421-1428.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I4/1421

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