Measurements of hydrogen peroxide concentrations in Tokyo and Thailand

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Gas-phase hydrogen peroxide (H2O2) is very harmful to plants when combined with ozone (O3). Information on ambient H2O2 concentrations, especially for long durations, is limited not only in Thailand and South East Asia but also in Japan. The objective of the present research was to accumulate data of H2O2 concentrations over long durations in Tokyo and Thailand. Hydrogen peroxide concentrations were monitored at Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan (lat. 35.7°N long. 139.5°E), Kasetsart University, Kamphaeng Saen, Nakhon Pathom (lat. 14.0°N long. 100.0°E) and Mae-On, Chiang Mai (lat. 18.8°N long. 99.2°E), Thailand in 2009, 2010 and 2011. During the measurement period, the monthly average H2O2 concentration in Tokyo ranged from 0.0 to 2.2 ppbv, and showed lower values in May, June and November 2010 and became zero in January, February and April 2011. In Chiang Mai, the monthly average H2O2 concentration was a little higher than that of Tokyo, ranging from 1.2 to 3.1 ppbv. The monthly average H2O2 concentrations in Nakhon Pathom were three to four times higher than those of Tokyo and Chiang Mai in the same period except March and April 2011. The diurnal characteristics of H2O2 concentrations from October to December 2009 in Tokyo and Chiang Mai were similar and high around noon and low in the morning and late afternoon. Nevertheless, the pattern of diurnal characteristics in 2010 at Chiang Mai was high in the morning and gradually decreased in the afternoon and it was different from Tokyo. In the case of Nakhon Pathom, the variation was high each time. Thus, the diurnal characteristics varied from place to place and year to year. A positive correlation between atmospheric H2O2 and O3 and air temperature in Tokyo was found in the present observation.

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  • 農業気象

    農業気象 68 (1), 45-53, 2012

    日本農業気象学会

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