基于TUV模式的对流层光解速率影响因子的研究

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Abstract

In this paper, a series of sensitivity tests were carried out using radiation transfer model (TUV) to determine the key factors affecting the photolysis rate of tropospheric O₃ and NO₂. The results showed that the optical properties of aerosols could have a significant impact on the photolysis rate. When the aerosol optical depth (AOD) was constant, the stronger the scattering was, the higher the near-surface photolysis rates were. When AOD increases from 0.5 to 2.5, the maximum values of J[O¹D] and J[NO₂] decreased by 30.3% and 13.1%, respectively. The photolysis rates were more sensitive to the change of smaller cloud optical depth. The effect of cloud on J[NO₂] varied with time significantly. In the morning and evening, the attenuation of J[NO₂] could reach 12%, while the attenuation of J[NO₂] in the noon was less than 4%. In the vertical direction, the presence of the cloud layer could reduce the photolysis rate under the cloud effectively via reducing the actinic flux through the cloud layer. The backscattering properties of cloud droplets increased the photolysis rate above the cloud. Ozone could absorb ultraviolet radiation around 300nm, so total ozone content had a considerable effect on J[O¹D]. The ozone column concentration increased from 200DU to 400DU, the maximum value of J[O¹D] decreased by 53.1%, while the maximum value of J[NO₂] was only reduced by 1.0%. At the same time, the relative position of aerosols and clouds was found having a great influence on the vertical distribution of the photolysis rate. When the aerosol was located above the cloud, the photolysis rate of the upper layer was significantly increased, and the stronger the scattering of the aerosol, the greater the increase of the photolysis rate; When the absorbing aerosol was located above the cloud, the actinic flux in the upper layer was greatly attenuated. The influence of the cloud on the photolysis rate was weak in this situation.

Key words： photolysis rate actinic flux cloud aerosol Tropospheric Ultraviolet and Visible Radiation Model

Received: 04 March 2019

PACS:

X131.1

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	ZAN Ya-yuan
	MA Xiao-yan
	TIAN Rong

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ZAN Ya-yuan,MA Xiao-yan,TIAN Rong. A study on the influencing factors of tropospheric photolysis rate based on TUV model[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3707-3718.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I9/3707

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