气象条件对上甸子地区气溶胶散射特征的影响

利用北京地区上甸子站气溶胶散射系数、PM2.5质量浓度和气象要素1 a的观测资料,研究不同天气条件下上甸子地区散射系数的变化特征,并讨论了气象条件对散射系数的影响.结果表明,散射系数在雾霾天最高608.4 Mm-1,其次为雾天500.6 Mm-1和霾天423.7 Mm-1,是一般天气散射系数的6.4～9.2倍.在各类天...

Effect of Weather Condition on the Aerosol Scattering Property at Shangdianzi

A study on the effect of weather condition on the aerosol scattering property has been carried out using one year measurement data sets of aerosol scattering coefficient (ASC) and meteorological parameters at Shangdianzi (SDZ). The results showed that the ASC was highest in haze-fog day with 608.4 Mm^-1 and higher in fog day with 500.6 Mm^-1 and haze day with 423.7 Mm^-1 those were 6.4-9.2 times higher than the ASC in normal day. The ASC was highest in summer in all kinds of weather conditions. The lower ASC in fog day and haze-fog day was observed in autumn and winter, respectively. There was no evident difference of the ASC between other three seasons in haze day and normal day. Pronounced seasonal variation of the mass scattering efficiency (MSE) of PM_2.5 was observed in fog day with the highest value in summer. Significant diurnal variations in ASC were observed in haze-fog day and normal day with a unimodal pattern and a bimodal pattern, respectively. The wind was the most important factor for the ASC at SDZ. The transport of aerosol particles by the strong southwest wind should be responsible for the higher level of ASC in SDZ area and regional scale in low visibility weather conditions. The northeast wind was favourable to the reduction of ASC, especially in normal day.