Effect of atmospheric aerosol on surface ozone variation over the Pearl River Delta region

Our analysis of the surface aerosol and ultraviolet (UV) measurements in Pearl River Delta (PRD) region shows that the surface UV radiation is reduced by more than 50% due to high aerosol concentrations. This has important impacts on urban ecosystem and photochemistry, especially on ozone photochemical production over the region. The quantitative effect of aerosols on surface ozone is evaluated by analyzing surface observations (including ozone, ultraviolet radiation, aerosol radiative parameters) and by using radiative and chemical models. A case study shows that the aerosol concentrations and UV radiation are significantly correlated with ozone concentrations. The correlation coefficient between the aerosol optical depth (AOD) and the PM10 mass concentration is very high, with a maximum of 0.98, and the AOD and UV radiation/ozone is anticorrelated, with a correlation coefficient of -0.90. The analysis suggests that ozone productivity is significantly decreased due to the reduction of UV radiation. The noon-time ozone maximum is considerably depressed when AOD is 0.6, and is further decreased when AOD is up to 1.2 due to the reduction of ozone photochemical productivity. Because the occurring probability of aerosol optical depth for AOD550nm>/0.6 and AOD340nm>/1.0 is 47, and 55% respectively during the dry season (October, November, December, January), this heavy aerosol condition explains the low ozone maximum that often occurs in the dry season over the Guangzhou region. The analysis also suggests that the value of single scattering albedo (SSA) is very sensitive to the aerosol radiative effect when the radiative and chemical models are applied, implying that the value of SSA needs to be carefully studied when the models are used in calculating ozone production.

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An edited version of this paper was published by Springer. Copyright 2011, Science China Press and Springer-Verlag Berlin Heidelberg


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Author Deng, Xue-Jiao
Zhou, Xiu-Ji
Wu, Dui
Tie, Xue-Xi
Tan, Hao-Bo
Li, Fei
Bi, Xue-Yan
Deng, Tao
Jiang, De-Hai
Publisher UCAR/NCAR - Library
Publication Date 2011-05-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:12:28.146931
Metadata Record Identifier edu.ucar.opensky::articles:11611
Metadata Language eng; USA
Suggested Citation Deng, Xue-Jiao, Zhou, Xiu-Ji, Wu, Dui, Tie, Xue-Xi, Tan, Hao-Bo, Li, Fei, Bi, Xue-Yan, Deng, Tao, Jiang, De-Hai. (2011). Effect of atmospheric aerosol on surface ozone variation over the Pearl River Delta region. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7g73f9f. Accessed 06 February 2025.

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