WPSTM-TEOMTM-MOUDITM的对比及大气气溶胶密度研究

通过对2005年夏季上海、北京地区大气气溶胶观测中3种不同原理气溶胶分析及采样仪的对比,考察了颗粒物个数浓度粒径分布仪（WPS^TM）、锥形元件振荡微量天平（TEOM^TMTM）在运行中所得数据的可比性.其中TEOM^TM测量PM_2.5质量浓度与WPS^TM计算PM_2.5质量浓度数据的相关系数分别为0.77和0.79,并发现在粗粒子颗粒物比例较高的时段二者相关性分别提高为0.91和0.84.MOUDI^TM分级质量浓度与WPS^TM计算分级质量浓度数据对比显示,除最小粒径分级外其他分级均有较好相关性（R分布在0.76～0.92）.应用2组不同对比数据推测了上海和北京观测点PM_2.5颗粒物密度,研究发现上海采样点颗粒物密度约为1.70 g·cm^-3,而北京采样点颗粒物密度约为1.50 g·cm^-3.

Inter-comparison of WPSTM-TEOMTM-MOUDITM and Investigation on Particle Density

Three aerosol samplers and analyzers were used to characterize aerosol size and mass at two sites downwind of Shanghai and Beijing urban center in summer 2005. Inter-comparison was performed for the mass concentration determined by WPS^TM, TEOM^TM and MOUDI^TM. The data got from TEOM and WPS showed the correlation factor of 0.77 and 0.79. And strong correlation has been found during the hour when coarse mode particles were dominated (R=0.91 and 0.84). Also, comparison between data from WPS and MOUDI showed good correlation in difference size ranges (R ranged from 0.76 to 0.92) except the minimum stage. The particle densities at the two sites were determined based on the observed real time PM^2.5 mass concentration and particle mass distribution data, respectively. The density of particles in Shanghai site was found to be around 1.70 g·cm^-3 while the Beijing site had a value of 1.50 g·cm^-3.