Abstract:Taking use of the aerosol number concentration, visibility and other observation data during January of 2013 at Tianjin, the effects of relative humidity on the aerosol size distribution and visibility were analyzed. During the observation period, there were four episodes in which the visibility was continuously less than 10km. The aerosol size distribution and relative humidity were the main factors on effecting visibility. When RH was lower than 90%, number concentration of aerosol particles increased gradually as RH increased. When RH was higher than 90%, number concentration of aerosol particles between 1μm and 2.5μm in diameter increased gradually as RH increased, while number concentration of aerosol particles less than 1μm and between 2.5μm and 10μm in diameter decreased gradually as RH increased. The mean value of aerosol hygroscopic growth factors at 80% RH [f (RH=80%)] was 2.04. Water vapor had a great influence on the visibility with high RH in fog and may even exceed the influence of aerosol particle concentration on visibility.
姚青, 蔡子颖, 韩素芹, 刘爱霞, 刘敬乐. 天津冬季相对湿度对气溶胶浓度谱分布和大气能见度的影响[J]. 中国环境科学, 2014, 34(3): 596-603.
YAO Qing, CAI Zi-Ying, HAN Su-Qin, LIU Ai-Xia, LIU Jing-Le. Effects of relative humidity on the aerosol size distribution and visibility in the winter in Tianjin. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(3): 596-603.