Seminar: Dr. King-Fai Li

Dr. King-Fai Li of the Division of Geological and Planetary Sciences from the California Institute of Technology and Department of Applied Mathematics, University of Washington will be presenting a seminar today at 1pm in Burnside Hall 934.


A persistent discrepancy between the model and observed stratospheric O3 solar response is revisited using the Whole-Atmosphere Community Chemistry Model (WACCM). The model O3 simulated using UV irradiances measured from the latest spaceborne solar UV measurements by the Solar Radiation and Climate Experiment (SORCE) and that from the solar UV parametrization developed by the Naval Research Laboratory (NRL) are studied and compared with observations. None of the simulations using SORCE and NRL UV simultaneously agree with the observed O3 solar response in both upper and lower stratospheres, thus presenting a dilemma to our current understanding of stratospheric O3 response to UV perturbations. However, the simulation using the SORCE UV irradiance leads to a solar response in upper stratospheric/lower mesospheric OH column that agrees better that those derived from ground-based and satellite observations. Continuous long-term observations of solar UV, OH, O3 and other related chemical species through upcoming solar cycles are crucial for further investigations to solve these above puzzles.

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