Japan Geoscience Union Meeting 2021

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS05] Atmospheric Chemistry

Sun. Jun 6, 2021 10:45 AM - 12:15 PM Ch.08 (Zoom Room 08)

convener:Tomoki Nakayama(Graduate School of Fisheries and Environmental Sciences, Nagasaki University), Naoko Saitoh(Center for Environmental Remote Sensing), Sakae Toyoda(Department of Chemical Science and Engineering, Tokyo Institute of Technology), Risa Uchida(Japan Automobile Research Institute), Chairperson:Nobuyuki Takegawa(Graduate School of Science, Tokyo Metropolitan University)

11:00 AM - 11:15 AM

[AAS05-07] New particle formation from ozonolysis of 2-methyl-2-butene and trans-2-butene

*Satoshi Inomata1, Jun Hirokawa2, Yosuke Sakamoto3 (1.National Institute for Environmental Studies, 2.Hokkaido University, 3.Kyoto University)

Keywords:2-methyl-2-butene, trans-2-butene, ozonolysis, secondary organic aerosol,, Criegee intermediate

Atmospheric aerosols scatter and absorb incoming solar radiation, which directly impacts the global radiative balance of the atmosphere. If these aerosols are hydrophilic, they can act as cloud condensation nuclei (CCN) and have an indirect effect on the climate by modifying the properties of clouds. New particle formation (NPF) through nucleation is believed to contribute up to half of the global CCN concentrations. The nucleation and growth mechanisms of new particles in the atmosphere have therefore been topics of study in atmospheric research. Recently, we observed NPF during ozonolysis of isoprene (C5H8) and ethene (C2H4). We proposed that oligomeric hydroperoxides originated from stabilized Criegee intermediates (sCIs) that were generated during the ozonolysis of isoprene and ethene potentially contribute to the NPF. In the present work, we investigated the ozonolysis of 2-methyl-2-butene (C5H10) and trans-2-butene (C4H8), in order to investigate the role of C2-sCI ((CH3)CHOO) on the new particle formation.