On the Variability and Correlation of Surface Ozone and Carbon Monoxide Observed in Hong Kong Using Trajectory and Regression Analyses

WANG Tijian; K. S. LAM; C. W. TSANG; S. C. KOT

doi:10.1007/BF02915688

Impact Factor: 5.8

Volume 21 Issue 1

Jan. 2004

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Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2004 > 21(1): 141-152

On the Variability and Correlation of Surface Ozone and Carbon Monoxide Observed in Hong Kong Using Trajectory and Regression Analyses

1.
Department of Atmospheric Sciences,Nanjing University,Nanjing 210093;Environmental Engineering Unit,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,Environmental Engineering Unit,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,Environmental Engineering Unit,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,Department of Mechanical Engineering,Hong Kong University of Science & Technology,Hong Kong

doi: 10.1007/BF02915688

Abstract
References
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Abstract:
This paper investigates,the variability and correlation of surface ozone (03) and carbon monoxide (CO) observed at Cape D'Aguilar in Hong Kong from I January 1994 to 31 December 1995.Statistical analysis shows that the average 03 and CO mixing ratios during the two years are 32:k17 ppbv and 305:k191ppbv,respectively.The O3/CO ratio ranges from 0.05 to 0.6 ppbv/ppbv with its frequency peaking at 0.15.The raw dataset is divided into six groups using backward trajectory and cluster analyses.For data assigned to the same trajectory type,three groups are further sorted out based on CO and NOx mixing ratios.The correlation coefficients and slopes of O3/CO for the 18 groups are calculated using linear regression analysis.Final]y,five kinds of air masses with different chemical features are identified:continental background (CB),marine background (MB),regional polluted continental (RPC),perturbed marine (P'M),and local polluted (LP) air masses.Further studies indicate that 03 and CO in the continental and marine background air masses (CB and MB) are positively correlated for the reason that they are well mixed over the long range transport before arriving at the site.The negative correlation between 03 and CO in air mass LP is believed to be associated with heavy anthropogenic influence,which results from the enhancement by local sources as indicated by high CO and NOx and depletion of 03 when mixed with fresh emissions.The positive correlation in the perturbed marine air mass P*M favors the low photochemical production of 03.The negative,correlation found in the regional polluted continental air mass RPC is different from the observations at Oki Island in Japan due to the more complex 03 chemistry at Cape D'Aguilar.
- ozone,carbon monoxide,trajectory
References

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Manuscript History

Manuscript received: 10 January 2004

Manuscript revised: 10 January 2004

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

On the Variability and Correlation of Surface Ozone and Carbon Monoxide Observed in Hong Kong Using Trajectory and Regression Analyses

1. Department of Atmospheric Sciences,Nanjing University,Nanjing 210093;Environmental Engineering Unit,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,Environmental Engineering Unit,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,Environmental Engineering Unit,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,Department of Mechanical Engineering,Hong Kong University of Science & Technology,Hong Kong

Manuscript received: 2004-01-10
Manuscript revised: 2004-01-10

Abstract: This paper investigates,the variability and correlation of surface ozone (03) and carbon monoxide (CO) observed at Cape D'Aguilar in Hong Kong from I January 1994 to 31 December 1995.Statistical analysis shows that the average 03 and CO mixing ratios during the two years are 32:k17 ppbv and 305:k191ppbv,respectively.The O3/CO ratio ranges from 0.05 to 0.6 ppbv/ppbv with its frequency peaking at 0.15.The raw dataset is divided into six groups using backward trajectory and cluster analyses.For data assigned to the same trajectory type,three groups are further sorted out based on CO and NOx mixing ratios.The correlation coefficients and slopes of O3/CO for the 18 groups are calculated using linear regression analysis.Final]y,five kinds of air masses with different chemical features are identified:continental background (CB),marine background (MB),regional polluted continental (RPC),perturbed marine (P'M),and local polluted (LP) air masses.Further studies indicate that 03 and CO in the continental and marine background air masses (CB and MB) are positively correlated for the reason that they are well mixed over the long range transport before arriving at the site.The negative correlation between 03 and CO in air mass LP is believed to be associated with heavy anthropogenic influence,which results from the enhancement by local sources as indicated by high CO and NOx and depletion of 03 when mixed with fresh emissions.The positive correlation in the perturbed marine air mass P*M favors the low photochemical production of 03.The negative,correlation found in the regional polluted continental air mass RPC is different from the observations at Oki Island in Japan due to the more complex 03 chemistry at Cape D'Aguilar.

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