【摘要】 2017年2—3月,采用黑碳仪、浊度仪和能见度仪在桂林市开展气溶胶吸收、散射等系数测量,探索该市气溶胶及气体的消光特征,并估算其对大气消光的贡献度。结果表明,桂林市春季气溶胶散射系数(σsp)范围为4. 64 Mm-1～1 264. 41 Mm-1,均值为220. 52 Mm-1,吸收系数(σap)范围为3. 66 Mm-1～120. 86 Mm-1,均值为20. 05 Mm-1。气溶胶及气体散射系数和吸收系数具有显著的双峰双谷等日变化特征,这与桂林市占比较大的旅游大巴等机动车运行时间有关。气溶胶消光系数占大气消光系数92. 65%,其中散射系数和吸收系数分别占83. 54%和9. 11%;气体消光系数占比为7. 35%。更多还原

【Abstract】 The absorption and scattering coefficients of aerosol were measured by aethalometer,nephelometer and visibility meter from February to March,2017 in Guilin. The extinction characteristics of aerosol and gas were studies and their contributions to extinction were evaluated. The results indicated that the scattering coefficient( σsp) of aerosol in Guilin ranged from 4. 64 Mm-1～ 1 264. 41 Mm-1 with a mean value of 220. 52 Mm-1,while the absorption coefficient( σap) ranged from 3. 66 Mm-1～ 120. 86 Mm-1 with a mean value of 20. 05 Mm-1.Aerosol,scattering and absorption coefficients of gas,all had significant diurnal variation,i. e.,double peak and double valley,this was due to the driving time of tourism buses which accounted for a large proportion of motor vehicles in Guilin. The extinction coefficient of aerosol accounted for 92. 65% of atmosphere extinction coefficient,in which scattering and absorption coefficients accounted for 83. 54% and 9. 11%,respectively. Gas extinction coefficient accounted for 7. 35%.更多还原