Speaker: Li Yaowei, PhD Student, Harvard University
Time: 09:00-11:00 a.m., January 5, 2024, GMT+8
Venue: B112, Environmental Building, PKU
Abstract:
Aerosols in the stratosphere and upper troposphere (S/UT) play a crucial role in modifying radiative forcing by scattering or absorbing radiation, while also influencing ice cloud nucleation. Stratospheric aerosols further affect ozone chemistry by modulating the heterogenous reaction rates of halogen species on particle surfaces. Climate and chemical impacts of aerosols are greatly influenced by their microphysics, chemical composition, and morphology. The Dynamics and Chemistry of the Summer Stratosphere(DCOTSS) airborne mission presented an opportunity for comprehensive characterizations of S/UT aerosols over North America in 2021 and 2022. In this talk, he will highlight volcanic and wildfire perturbations to S/UT aerosols sampled during the DCOTSS mission, and discuss the climate and chemical consequences of these perturbations. He will also shed light on the potential significance of largely overlooked organic-containing aerosols in the S/UT, along with some laboratory work refining their optical and morphological properties.
Source: College of Environmental Sciences and Engineering, PKU