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] The continuous operation of the portable automated lidar (PAL) and measurement of suspended particulate matter (SPM) results in the observation of the diurnal changes of the mass extinction efficiency (MEE). MEE is the ratio of the extinction coefficient to the SPM concentration which relates the amount of mass to the optical extinction of aerosols. Our results show that in the height region of 300 ? 500 m, the daytime MEE values are smaller than the nighttime MEE values. This can be attributed to the aerosol growth (rapid growth) due to the higher relative humidity during nighttime. Using the Mie scattering theory, a simulation study of MEE is also undertaken by computing the extinction coefficient from the 6-year averaged air sampling measurements in Chiba University. Hygroscopic effects on aerosols are considered in the simulation and results show that MEE increases with RH, in agreement with the observation stated above. When this type of direct effect of RH (rapid growth) is irrelevant, high and low MEE values can be ascribed to fine and coarse particles, respectively, for both measurement and simulation. In addition, MEE values are computed for individual aerosol components (elemental carbon (EC), organic carbon, NH4SO4, NH4NO3, sea salt, soil, EC-NH4SO4 mixture), with EC having the highest computed MEE of 7.3 m^2g^-1 and NH4NO3 with the lowest MEE of 1.2 m^2g^-1.
一次資料へのリンクURLhttps://opac.ll.chiba-u.jp/da/curator/104195/BA71319447-10-P200.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）