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

J. Han, B. Shin, Meehye Lee, G. Hwang, J. Kim, J. Shim, G. Lee, C. Shim

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)12611-12621
Number of pages11
JournalAtmospheric Chemistry and Physics
Volume15
Issue number21
DOIs
Publication statusPublished - 2015 Nov 12

ASJC Scopus subject areas

  • Atmospheric Science

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