Seminar

Abstract

p>Chemical transport models (CTMs) are now at a mature stage of development, and we are in an era with an unprecedented availability of measurements of tropospheric ozone from satellites, sondes and the surface. I will show two examples where analysis of data in combination with results of model simulations reveals the influence of dynamics on tropospheric ozone. First I will discuss the spatial-temporal patterns in ozone revealed by TES and MLS in the tropics, and describe their use in testing a model's vertical transport. Such tests are directly applicable to chemistry-climate models as they are based on recurring features in the data. Secondly, I will describe recent results from an ozone hindcast for 1990-2011 using the GMI model driven by the MERRA reanalysis. The model reproduces the interannual variability (IAV) in ozone in the lowermost stratosphere seen in MLS and sonde data, and captures much of the IAV and short-term trends in sonde data in the mid-troposphere and in surface ozone at remote sites, showing the influence of variability in dynamics.