ATMOCHEM - POllution: MODeling and ObseRvatiOns (POMODORO)

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Despite numerous case studies, there is lack of knowledge about the global impact of pollution through biomass burning and anthropogenic sources on tropospheric ozone and the radical budget. Further the pathways and relevance of transport of pollutants into the lower stratosphere need clarification. This project combines altitude-resolved MIPAS limb measurements of various primary and secondary pollutants (CO, C2H6, C2H2, PAN, HNO3, O3, HCN, CH2O and others) and IASI ozone and CO tropospheric column measurements with model calculations and data assimilation to provide a better understanding of the sources, uplift, chemical processing, long-range transport and troposphere-to-stratosphere exchange of pollutants. MIPAS measurements of various pollutants will be used to distinguish different pollution sources (industrial/urban vs. biomass burning) by the chemical composition of plumes, taking advantage of the fact that plumes of different sources are characterized by different ratios of pollutants which can be used as chemical fingerprint. IASI ozone and CO measurements will be used to track plume propagation. Particular care will be devoted to quality assessment, improvement, and complement of spectroscopic data of pollutants, a key issue in remote sensing. Observations provided by this project will be complemented by MOPITT, SCIAMACHY, MLS, ODIN, ACE, as well as CARIBIC aircraft observations and will be used to constrain and verify modeling of pyroconvection, long range transport and chemical processing of pollutants, the relevance of various types of pollution to upper tropospheric ozone chemistry, and the intrusion of pollutants into the lower stratosphere. The tools to be used include chemical transport models (MOCAGE), data assimilation tools (MOCAGE-PALM), chemistry general circulation models (ECHAM5/MESSy), and Lagrangian tools. The goal is to assess the impact of pollution of various sources on a global scale.