通过自主研发的基于光腔衰荡光谱技术的气溶胶消光仪,对昆山大 气气溶胶的消光性质进行观测 实验,并研究了相对湿度对气溶胶消光系数的影响。观测结果表明：监测点的大气气溶胶消光系数较 高,且日变化在早晨7:00出现最高值,至下午17:00达到最低值后开始回升,其主要是由气象条件及周 边强污染源的影响造成。气溶胶亲水特性实验表明:监测点的大气气溶胶多为污染海洋 型,受周围环境相对湿度的影响较大。该研究结果为后期结合气溶胶质谱等其它监测仪器对该地 大气气溶胶性质进行进一步观测研究具有一定的指导意义。

Laser cavity ring-down spectrometers (CRDS) developed are used to investigate the aerosol light extinction and the influence caused by relative humidity during a long term experiment around Kunshan, Jiangsu. Observation results show that mean value of extinction coefficient is quite high, and a clear diurnal pattern is observed in extinction coefficient with maximum occurring at 7:00, dropping down to minimum at 17:00, then rising again, which is caused by the great influence of the surrounding heavily polluted areas and meteorological conditions. Results for the hydrophilic properties of atmospheric aerosol in the monitoring site show that atmospheric aerosol is hydrophilic type, and extinction coefficient is susceptible to the ambient relative humidity. The results have certain guiding significance for the further study of atmospheric aerosol properties of this area with aerosol mass spectrometry and other monitoring instruments.