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On Surface O3 Associated with Long-Range Transport in the Yellow Sea Region

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Abstract

Measurements of surface ozone (O3) and nitrogen oxides (NO x ) were conducted at Tae-ahn (TAP) and Chongwon (CHN) on the Korean Peninsula, during the Aerosol Characterization Experiment—Asian Pacific region (ACE-Asia) campaign, March–May 2001. The measurements provide ground-based data at a western remote site of south Korea and characterize the long-range transport of O3 over the Yellow Sea region during spring. The mean values of O3 and NO2 concentration at TAP were 42 ppb and 12 ppb, respectively. The average O3 diurnal variation of 17 ppb at TAP indicates that the loss of O3 was not pronounced during the night. The highest NO2 concentrations, with an average diurnal variation of 8 ppb, occurred in the afternoon at 13–15 LST. The day-to-day variation of daily O3 concentrations at TAP is strongly influenced by the movement of synoptic scale weather patterns. In general, the O3 concentration in a southwesterly airflow tended to increase when a moving anticyclone crossed the site, ahead of a cold front. By contrast, north-northwesterly airflows associated with the passage of a cold front bring fresh continental outflow and decrease O3 concentrations.

Surface O3 data at TAP were classified utilizing backward trajectory analysis based on the residence time, as well as the path of the airflows, in the boundary layer (1500 m asl) over the Yellow Sea region. The results show that north-northwest continental airflows, that were transported around Lake Baikal and eastern Mongolia at an altitude of approximately 3 km at relatively high speed and came straight down at TAP, represent continental background O3 concentrations with a mean value of 29 ppb for this period. These airflows have a short period of residence of less than one day in the boundary layer over the Yellow Sea region. In contrast, the mean O3 value of 45 ppb was observed in regionally polluted airflows mainly passing through the east-southeast part of China and remaining for 3 days, on average, in the Yellow Sea region. These three days residence time of the regionally polluted airflows over the Yellow Sea region allowed sufficient time for photochemical O3 formation.

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Authors and Affiliations

  1. Korea-China Centre for Atmospheric Research, 304 Koonghyon, Kangnae, Chongwon, Choongbuk, Korea, 363-891

    H. S. Kim & Y. S. Chung

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  1. H. S. Kim
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  2. Y. S. Chung
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Correspondence to Y. S. Chung.

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Kim, H.S., Chung, Y.S. On Surface O3 Associated with Long-Range Transport in the Yellow Sea Region. Water Air Soil Pollut 165, 95–112 (2005). https://doi.org/10.1007/s11270-005-4639-2

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