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Volume 15, issue 21
Atmos. Chem. Phys., 15, 12611–12621, 2015
https://doi.org/10.5194/acp-15-12611-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 15, 12611–12621, 2015
https://doi.org/10.5194/acp-15-12611-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Nov 2015

Research article | 12 Nov 2015

Variations of surface ozone at Ieodo Ocean Research Station in the East China Sea and the influence of Asian outflows

J. Han1, B. Shin1,2, M. Lee1, G. Hwang1, J. Kim1, J. Shim3, G. Lee4, and C. Shim5 J. Han et al.
  • 1Department of Earth & Environmental Sciences, Korea University, Seoul, South Korea
  • 2Environmental Meteorology Research Division, National Institute of Meteorological Sciences, Jeju, South Korea
  • 3Coastal Disaster Research Center, Korea Institute of Ocean Science & Technology, Ansan, South Korea
  • 4Department of Environmental Science, Hankuk University of Foreign Studies, Yongin, South Korea
  • 5Korea Environment Institute, Sejong, South Korea

Abstract. Ieodo Ocean Research Station (IORS), a research tower (~ 40 m a.s.l.) for atmospheric and oceanographic observations, is located in the East China Sea (32.07° N, 125.10° E). The IORS is almost equidistant from South Korea, China, and Japan and, therefore, it is an ideal place to observe Asian outflows without local emission effects. The seasonal variation of ozone was distinct, with a minimum in August (37 ppbv) and two peaks in April and October (62 ppbv), and was largely affected by the seasonal wind pattern over east Asia. At IORS, six types of air masses were distinguished with different levels of O3 concentrations by the cluster analysis of backward trajectories. Marine air masses from the Pacific Ocean represent a relatively clean background air with a lowest ozone level of 32 ppbv, which was most frequently observed in summer (July–August). In spring (March–April) and winter (December–February), the influence of Chinese outflows was dominant with higher ozone concentrations of 62 and 49 ppbv, respectively. This study confirms that the influence of Chinese outflows was the main factor determining O3 levels at IORS and its extent was dependent on meteorological state, particularly at a long-term scale.

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In east Asia, emissions of O3 precursors have gradually increased and O3 concentrations are expected to increase in the near future. Ieodo Ocean Research Station (IORS), located in the East China Sea, is a unique research tower suitable for observing continental outflows from east Asia. In this study, we present long-term measurements of O3 at IORS, describe their characteristic variations, and evaluate their continental influence on the regional background concentrations of O3.
In east Asia, emissions of O3 precursors have gradually increased and O3 concentrations are...
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