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Multi-Model Comparisons for Assessing Long-Range Transport of Pollution

This study presents a comprehensive evaluation of various atmospheric models to investigate the long-range transport of pollution. By comparing outcomes from models such as MOZART, TOMCAT, and GEOS-Chem, we identify key discrepancies arising from complex processes including chemistry, photolysis, and aerosol interactions. The goal is to advance understanding of how these models simulate pollution transport under different climate scenarios. Our approach includes passive tracer analysis and future climate simulations, aiming to enhance model interoperability and support the HTAP processes.

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Multi-Model Comparisons for Assessing Long-Range Transport of Pollution

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  1. M.J. Evans1, I Bey2, A.M. Fiore3, G. Folberth2, V. Huijnen4, S. Koumoutsaris2, P. Moinat5, M. Schultz6, S. Schröder6,ITOP/INTEX/NEAQS7 1 School of Earth and Environment, University of Leeds, Leeds, United Kingdom, 2 EPFL, Lausanne, Switzerland, 3 NOAA GFDL, 201 Forrestal Rd, Princeton, NJ, USA, 4 Climate Research - Chemistry and Climate, KNMI, De Bilt, The Netherlands, 5 CNRM, Toulouse, France 6 Forschungszentrum Jülich, ICG-2: Troposphäre, Jülich, Germany 7 ITOP/INTEX/NEAQS Science teams HTAP model (inter) comparisons

  2. The convention on long-range transport of pollution

  3. The convention on long-range transport of pollution

  4. Actors: ‘Never work with animals or children’ Modellers: ‘Never do a model inter-comparison’ You know the conclusion ‘The models differed due to a complex set of processes involving, chemistry, photolysis, aerosols, advection, convection, diffusion, wet deposition, dry deposition, emissions, the stratosphere, the ocean*, ………… * Choose your favourite three processes Multi-model comparisons / evaluations

  5. ‘Passive’ tracers Oliver Wild Annual full chemistry Arlene Fiore . Campaign full chemistry ? Future climates 4 Sets of model comparisons

  6. ‘Passive’ tracers Oliver Wild Annual full chemistry Arlene Fiore Campaign full chemistry Mat Evans + Isabelle Bey Future climates 4 Sets of model comparisons

  7. ICARTT / INTEX / NEAQS / ITOP

  8. MOZART TOMCAT MOCAGE MOZECH x 2 GEOS-Chem TM5 CAMCHEM (?) Current models

  9. Standard comparisons….. Plans

  10. Standard comparisons….. Plans

  11. Other approaches – more fun ….. Cluster analysis Principal components Some of these approaches have been used to analyse the ITOP observations. Now apply to the models Plans

  12. We will make the along flight model and measurement files public Hopefully find a way of ‘usefully’ comparing model capabilities to simulate long range transport of pollution Should inform the HTAP process Final thoughts

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