Seminar

Abstract

Our understanding of isoprene oxidation has been evolving rapidly in the past decade, resulting from a large amount of laboratory measurements, field observations and theoretical calculations. How these updates change our understanding on tropospheric ozone is unclear. Here we use a high resolution global chemistry-climate atmosphere model (GFDL AM3), with recent updates on isoprene oxidation mechanism, to examine this over Southeast US. We first evaluate our model with two aircraft campaign datasets (ICARTT in 2004 and SENEX in 2013) that took place nine years apart. We then focus on the model capabilities of capturing decadal changes of surface ozone and related photochemical products, and the implications for future ozone air quality over eastern US. We will also discuss the potential importance of nighttime chemistry on daytime ozone formation.