沖縄における大気中過酸化物の計測と挙動に関する研究

概要

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We studied the diurnal variation of atmospheric peroxides from August 2005 to December 2006 at the southern part of Okinawa Island, Japan. A stripping coil technique was used to capture gaseous peroxides in a phosphoric acid solution with its pH adjusted to 3.5. The concentrations of peroxides were determined using the p-hydroxyphenyl acetic acid (POHPAA) dimer technique. For many of the samples studied, the diurnal variation in the hydrogen peroxide (HOOH) mixing ratio did not follow a consistent pattern during the study period. In some cases, the HOOH mixing ratios were higher in the early morning than in the mid afternoon, while in other cases, the HOOH mixing ratios were relatively stable during the daytime. The HOOH mixing ratios ranged from 0.2 to 12.1 ppbv, with a mean of 4.8 ppbv. The HOOH mixing ratios showed seasonal variation with the highest observed in October and the lowest in August. Statistical analyses showed that the HOOH mixing ratios were correlated with the ozone mixing ratios (r=0.44), while other on-site meteorological parameters, such as wind direction, wind speed, and temperature, did not show any correlation for the samples studied. Moreover, backward trajectory analyses showed that the HOOH mixing ratios were higher when northern and northwestern winds prevailed.
2008-06-25