Biography: Yiling Ma is a PhD student at Institute of Meteorology and Climate Research (IMK), Karlsruhe Institute of Technology (KIT) since 2023, mainly working on developing hybrid approach that integrate machine learning with physical climate models to improve ozone modeling, particularly in the context of a changing climate. She holds a BSc in Atmospheric Science and a MSc in Climate Dynamics (2016-2023). Her research interests involve climate change, machine learning application in climate science, atmospheric chemistry modelling, ocean-atmosphere interaction.
Abstract: Atmospheric ozone is a crucial absorber of solar radiation and an important greenhouse gas. However, most climate models participating in the Coupled Model Intercomparison Project (CMIP) still lack an interactive representation of ozone due to the high computational costs of atmospheric chemistry schemes. In this talk, I will present a machine learning parameterization (mloz) to interactively model daily ozone variability and trends across the troposphere and stratosphere in standard climate sensitivity simulations, including two-way interactions of ozone with the Quasi-Biennial Oscillation. We demonstrate its high fidelity on decadal timescales and its flexible use online across two different climate models -- the UK Earth System Model (UKESM) and the German ICOsahedral Nonhydrostatic (ICON) model. With atmospheric temperature profile information as the only input, mloz produces stable ozone predictions around 31 times faster than the chemistry scheme in UKESM, contributing less than 4% of the respective total climate model runtimes. In particular, we also demonstrate its transferability to different climate models without chemistry schemes by transferring the parameterization from UKESM to ICON. This highlights mloz’s potential for widespread adoption in CMIP-level climate models that lack interactive chemistry for future climate change assessments, particularly when focusing on climate sensitivity simulations, where ozone trends and variability are known to significantly modulate atmospheric feedback processes.