タイトル(掲載誌)Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集
一般注記type:text
[ABSTRACT] In order to understand the effects of anthropogenic air pollutants on atmospheric heat budget, the radiative properties of aerosols were investigated over the urban area of Nagoya. Measurements included size distributions of aerosols greater than 0.3 μm in diameter, scattering coefficients and absorption coefficients. The mean values with standard deviations for hourly averages of scattering coefficients, absorption coefficients and single scattering abledos were reported to be 52.3±39.3Mm^-1, 24.6±18.3Mm^-1 and 0.66±0.13 respectively. Such low values of single scattering albedos suggest that aerosols of the urban area of Nagoya are highly absorptive in nature, which have a potential to warm our climate. Comparison of our results with other polluted cities of US and China were also performed. Mass scattering efficiency of dry aerosols and mass absorption efficiency of black carbon over the urban area of Nagoya were found to be around 4.7m^2g^-1, and 14.6m^2g^-1 respectively. Before and after the rain events, diurnal variations of radiative properties were observed. Such diurnal variations were suggested to be driven by local pollutants rather than meteorological changes throughout the day. The prominent peaks of black carbon concentrations and absorption coefficients during morning were suggested to be the effects of local sources such as burning and vehicles whereas peaks of scattering coefficients observed during afternoon were found to be the effects of photochemically driven aerosol production. Two different effects of rain events on scattering coefficients were also observed. It was estimated by the observation data that the rain events reduced scattering coefficients by washing out coarse and accumulation mode aerosols, whereas the continuous rain events increased scattering coefficients by condensing water vapor to non-washed aerosols of the atmosphere.
一次資料へのリンクURLhttps://opac.ll.chiba-u.jp/da/curator/104178/BA71319447-10-P091.pdf
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース(IRDB)(機関リポジトリ)