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Chemistry-climate modelling

Chemistry-climate modelling. G. Zeng, O. Morgenstern and J. A. Pyle NCAS-ACMSU and Centre for Atmospheric Science, University of Cambridge. Highlights. UKMO Unified Model (UM) with tropospheric chemistry ----- UM/CHEM

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Chemistry-climate modelling

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  1. Chemistry-climate modelling G. Zeng, O. Morgenstern and J. A. Pyle NCAS-ACMSU and Centre for Atmospheric Science, University of Cambridge

  2. Highlights • UKMO Unified Model (UM) with tropospheric chemistry ----- UM/CHEM • Community CCM based on “New Dynamics“ UM 5.5 with UKMO and U. Leeds (in development) ----- U.K. Chemistry and Aerosols (UKCA)

  3. UM/CHEM • UKMO Unified Model vn4.4/4.5 Horizontal: 96x73 grids Vertical: 19 hybrid-pressure levels Improved advection scheme (monotonic, conservative, non-diffusive) Forced by prescribed SSTs

  4. UM/CHEM • Tropospheric chemical module NOx-CO-CH4-NMHCs (60 species 36 advected) Wet/dry depositions Surface, lightning and aircraft emissions Tabulated photolysis rates O3, NOy and CH4 are prescribed above 30 hPa. ASAD solver (implicit time integration scheme)

  5. Experiments • Time-slice Integrations Present-day simulation Future simulations (with/without doubled CO2) Preindustrial simulation Emissions based on IPCC SRES A2 scenarios

  6. UM/CMEM O3 [ppbv] O3 [ppbv] Seasonally averaged O3 profile (ppbv) by measurements (symbols) and by simulations. Data source from Logan (1999)

  7. Annual and zonal mean O3 [ppbv] and differences between 2000 and 2100 simulations See: G. Zeng and J.A. Pyle, Changes in tropospheric ozone between 2000 and 2100 modeled in a chemistry-climate model, GRL, 30(D7), 2003

  8. Tropospheric Ozone Budgets Flux units in Tg/yr; burdens in Tg

  9. Experiments • Longer time simulations covering 1990-2001 forced by observed SSTs G. Zeng and J.A. Pyle, Influence of El Nino Southern Oscillation on the global tropospheric ozone budget, submitted to GRL, 2004

  10. R=-0.6 R=-0.78 SOI: deseasonalized monthly mean Tahiti (18S,150W) minus Darwin (13S,131E) surface pressure STE: deseasonalized monthly mean STE anomaly

  11. Outlook • Longer-time integrations on present and future, preindustrial and prehistoric atmospheres in a coupled mode • Include halogen chemistry in the UM/CHEM • Interactive surface emissions and dry deposition

  12. UKCA • Global chemistry-aerosol-climate model suitable for long integrations, as a community model • “New Dynamics”: Non-hydrostatic dynamics, s-altitude vertical coordinate, semi-Lagrangian advection • Whole-atmosphere chemistry schemes of different complexities • Modular, advanced aerosol package • Ability for future users to implement their own chemistry with minimal coding

  13. UKCA Ozone [ppbv] at 800, 500, and 300 hPa for Hilo, Natal, and Samoa

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