摘要
就近年来天津市能见度逐渐降低的现象,利用M9003浊度计并辅以同期观测的污染物浓度和气象因子资料,考察了颗粒物散射消光对能见度的影响.得出颗粒物散射消光约占总消光的83.5%,且细粒子是影响能见度降低的主要因素.PM2.5的总散射效率和对细粒子的散射效率分别为6.05和3.4 m^2/.并根据颗粒物的散射消光特征日变化趋势总结出天津市颗粒物的散射消光类型可划分为:双峰型、单峰型和平滑型三类.
The visibility of Tianjin in winter is gradually reducing in recent years. Because of the phenomenon, the impact of particulate matter light scattering to visibility is discussed, based on particulate matter light scattering （bsp） measured by a nephelometer（M9003） and contamination concentration and meteorological data. The result is that the light scattering is about 83.5 percent of the light extinction and fine particulate matter （PM2.5） is the main factor to infect reduce of visibility. The scattering efficiency of PM2.s to total particulate matter and fine particulate matter are 6.05 and 3.4 m^2/g respectively. Based on the diurnal patterns of light scattering in Tianjin, the three diurnal patterns are summarized. These are （1） doublepeaks pattern, （2） only-peak pattern, （3） little-diurnal variation pattern.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第2期73-76,86,共5页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
国家自然科学基金(20677030)
天津市社发项目(06YFSYSF02900)
天津市教委项目(20070705)
关键词
能见度
颗粒物
散射
消光
visibility
particulate matter
scattering
extinction
