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Tropospheric ozone inter-annual variability and extreme events

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Wednesday, 06 March 2019, 12:00

Wednesday, March 6, 2019. 12:00PM. Tropospheric ozone inter-annual variability and extreme events. Alex Zhang, CICS-P. Sponsored by NOAA GFDL. More information here.

 

Better knowledge on how well current global climate-chemistry models represent the inter-annual variabilities (IAVs) and extremes of tropospheric ozone (O3) as well as their driving factors is with great importance for understanding and predicting long-term O3 trends with models. Here we explore the IAVs of tropospheric O3 in the northern hemisphere simulated with multiple chemistry-climate models participating in the Chemistry-Climate Model Initiative phase 1 (CCMI-1) and assess the models’ performances of simulating the O3 extremes during extreme weather conditions in the U.S. We find that the examined models have diverse performances on simulating the tropospheric O3 IAVs with or without observational constraints and all models underestimate O3 anomalies during heat waves over the past three decades. Using intensive field measurements and the latest AM4 and GEOS-Chem at high resolutions, we specifically investigate the IAVs and sources of springtime O3 in the western U.S. and find that background O3 is the key driver of O3 IAV there with STT O3 dominating the background O3. Our findings have advanced the knowledge of the abilities and deficiencies of current climate-chemistry models in representing the IAVs and extremes of tropospheric O3.

Location  NOAA GFDL, Smagorinsky Seminar Room, Princeton University, Princeton, NJ