Geography Distinguished Seminars Series
The impact of climate change on extreme weather events, ozone and PM2.5 based on a high-resolution earth system model
Date: 12 JUL 2023 (Wednesday)
Time: 11:00-12:30 (HKT)
Mode: Hybrid Mode
Venue: CLL, Room 10.10, 10F, The Jockey Club Tower, Centennial Campus, HKU
Under a warming climate, both extreme weather events and severe air pollution are projected to increase in general. Whereas large uncertainties exist with the current Coupled Model Intercomparison Project Phase 6 (CMIP6) studies, we recently developed and optimized the high-resolution earth system model based on Community Earth System Model (CESM), showing substantial improvement in both climate extremes and air quality simulations. In this talk, the development and improvement of high-resolution earth system model will be firstly introduced, followed by climate impact on extreme weather events such as heat waves in land and ocean, and how these climate extremes affect ozone and PM2.5, e.g., through the stimulation of enhanced biogenic emissions as well as photochemical reactions.
Professor Yang Gao
Professor in Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, China
Professor Gao finished the PhD study at the University of Tennessee, Knoxville, and worked Pacific Northwest National Laboratory as post-doc during 2013-2016. After that, he joined Ocean University of China as a faculty member. He has been working regional climate and air quality modeling for more than 10 years. Most recently, he focuses on the development of high-resolution Earth system model, aiming to improve the capability of global models in reproducing climate extremes and severe air pollution. Followed by the model improvement, he tries to understand how climate extremes such as heat waves and stagnant weather conditions evolve under a warming climate, as well as their impact on air quality. During the investigation, the mechanism of extreme weather events in particular of compound extremes on major air pollutants including ozone and PM2.5 is revealed, such as through the stimulation of biogenic emissions over urban areas based on improved land cover dataset. Motivated by the study, a high-resolution urban greenspace emission inventory in China is constructed and publicly released. He has published more than 100 peer reviewed journal articles including journals of Nature Climate Change, PNAS, National Science Review.