AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Response of Aerosol Sources and Properties to Emission Controls: Results from Simultaneous Measurements at Ground level and 260 m in Beijing
Jian Zhao, Wei Du, Yingjie Zhang, Chen Chen, Weiqi Xu, Qingqing Wang, TINGTING HAN, Zifa Wang, Yele Sun, Inst. of Atmospheric Physics, Chinese Academy of Sciences
Abstract Number: 166 Working Group: Urban Aerosols
Abstract Strict emission controls were implemented in Beijing and adjacent provinces to ensure good air quality during the period of 20 August – 3 September. Here we conducted synchronous measurements of submicron aerosol (PM$_1) at two different heights, i.e., ground and 260 m on a meteorological tower in urban Beijing from 22 August to 31 September, by using a High-Resolution Aerosol Mass Spectrometer and an Aerosol Chemical Speciation Monitor. Our results showed that organic aerosols (OA) dominated PM$_1 at both ground and 260 m (54% and 51%, respectively) during the control period, however, secondary inorganic aerosols (SIA = sulfate + nitrate + ammonium) were more significant in PM$_1 after the control period (51 - 52%). These results suggested a larger impact of emissions controls on reduction of SIA compared with OA. The response of primary and secondary OA to emission controls were further investigated by positive matrix factorization analysis. Our results showed very different responses of POA and SOA to emission controls at different heights. Finally, the sources of aerosol species during the control and uncontrol periods were investigated using FLEXPART and bivariate polar plots.