Analyses of the concentration variations of ozone and carbon monoxide at Suzu, the Noto Peninsula

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  • 能登半島珠洲におけるオゾンと一酸化炭素の濃度変動要因の解析
  • ノト ハントウ スズ ニ オケル オゾン ト イッサンカ タンソ ノ ノウド ヘンドウ ヨウイン ノ カイセキ

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Abstract

Ozone and carbon monoxide were simultaneously observed since December 2008 at Suzu, the Noto Peninsula. We investigated the seasonal and diurnal variations of their concentrations in view of the long-range transport of air pollutants from the Asian continent. The O3 and CO concentrations had spring-peaks and a summer-minimum in their seasonal variations. The air mass arriving at Suzu was classified into sectors of Russia, China, and Japan using the backward trajectory analysis. In the spring, the fractions of continental origin, that is, the Russia and China air mass origins were high, while those of the Japan air mass origin were high in the summer. The air mass that originated from China had high concentrations for both O3 and CO during the observational period. On the other hand, the concentrations from the Russian air mass origin were lower than those from the Japanese air mass origin, even though Russia and China are on the same continent. The averaged diurnal variation of O3 showed a maximum peak in the afternoon, while that of CO did not show any systematic variation. The air mass origins and the photochemical O3 production during the long-range transport would cause the seasonal variation in the diurnal minimum concentrations of O3. The monthly change of the O3 increment in the daytime would indicate the photochemical O3 production in the vicinity of the observational site. There was a high positive correlation between the O3 increment in the daytime and integrated solar radiation.

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