10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Impact of Turbulence Parameters Influences on New Particle Formation Events in August Beijing
HAO WU, Fang Zhang, Zhanqing Li, Peng Yan, Yuying Wang, Xiaoai Jin, Xinxin Fan, Beijing Normal University
Abstract Number: 296 Working Group: Aerosol Physics
Abstract The Turbulent Kinetic Energy (TKE) affects convection, turbulence and entrainment, which can thus alter nucleation process due to the turbulent mixing that influences local supersaturation of precursor gases during New Particle Formation (NPF). During our experiment conducted in Beijing in August, we noted that the KTE occurs half an hour earlier than the particle burst. A further investigation of these cases suggests that the surface turbulence has a close relationship with the NPF event. A possible explanation is that short-time local supersaturation can trigger the binary nucleation process. Furthermore, we compared the Bowen Ratio (BR) with the growth rate (GR) and the condensation sink(CS), found that they are positively related. The Monin-Obukhov length(L) has a large fluctuation before the nucleation burst. Based on these findings, we proposed a kinetic mechanism of formation from the perspective of thermodynamic, and further explore the TKE and BR together with L as an indicator of NPF, association with other parameters such as Photosynthetically Active Radiation (PAR) or Net Radiation (NR) simultaneously. As aerosols won’t affect climate much until they grow to certain size, typically over tens of nm when they can be activated to form cloud droplets, Such particles are referred to as Cloud Condensation Nuclei.