Skip to main content
Article thumbnail
Location of Repository

Tropospheric ozone and its global budgets

By Guang Zeng, J. A. Pyle and P. J. Young

Abstract

We present the chemistry-climate model UMCAM in which a relatively detailed tropospheric chemical module has been incorporated into the UK Met Office's Unified Model version 4.5. We obtain good agreements between the modelled ozone/nitrogen species and a range of observations including surface ozone measurements, ozone sonde data, and some aircraft campaigns. Four 2100 calculations assess model responses to projected changes of anthropogenic emissions (SRES A2), climate change (due to doubling CO2), and idealised climate change-associated changes in biogenic emissions (i.e. 50% increase of isoprene emission and doubling emissions of soil-NOx). The global tropospheric ozone burden increases significantly for all the 2100 A2 simulations, with the largest response caused by the increase of anthropogenic emissions. Climate change has diverse impacts on O3 and its budgets through changes in circulation and meteorological variables. Increased water vapour causes a substantial ozone reduction especially in the tropical lower troposphere (>10 ppbv reduction over the tropical ocean). On the other hand, an enhanced stratosphere-troposphere exchange of ozone, which increases by 80% due to doubling CO2, contributes to ozone increases in the extratropical free troposphere which subsequently propagate to the surface. Projected higher temperatures favour ozone chemical production and PAN decomposition which lead to high surface ozone levels in certain regions. Enhanced convection transports ozone precursors more rapidly out of the boundary layer resulting in an increase of ozone production in the free troposphere. Lightning-produced NOx increases by about 22% in the doubled CO2 climate and contributes to ozone production. The response to the increase of isoprene emissions shows that the change of ozone is largely determined by background NOx levels: high NOx environment increases ozone production; isoprene emitting regions with low NOx levels see local ozone decreases, and increase of ozone levels in the remote region due to the influence of PAN chemistry. The calculated ozone changes in response to a 50% increase of isoprene emissions are in the range of between −8 ppbv to 6 ppbv. Doubling soil-NOx emissions will increase tropospheric ozone considerably, with up to 5 ppbv in source regions

Topics: GE Environmental Sciences
Year: 2008
DOI identifier: 10.5194/acp-8-369-2008
OAI identifier: oai:eprints.lancs.ac.uk:58852
Provided by: Lancaster E-Prints

Suggested articles

Citations

  1. (2007). Process-based estimates of terrestrial ecosystem isoprene emissions, doi
  2. (1999). Evaluated kinetic and photochemical data for atmospheric chemistry, organic species: Supplement VII, doi
  3. (1988). Ozone destruction and photochemical reactions at polar sunrise in the lower Arctic atmosphere, doi
  4. (2000). Time evolution of tropospheric ozone and its radiative forcing, doi
  5. (1998). Past and future changes in global tropospheric ozone: Impact on radiative forcing, doi
  6. (2006). S.: Impact of climate change on the future chemical composition of the global troposphere, doi
  7. (2006). Simulations of anthropogenic change in the strength of the Brewer-Dobson circulation, doi
  8. (2000). IMPACT: An implicit time integration scheme for chemical species and families, doi
  9. (2004). Amazonian forest dieback under climatecarbon cycle projections for the 21st Century, doi
  10. (1993). The unified forecast/climate model,
  11. (1997). Chemical Kinetics and Photochemical Data forUseinStratosphericModeling, doi
  12. (1990). The impact of air www.atmos-chem-phys.net/8/369/2008/ doi
  13. (2005). Influence of convective transport on tropospheric ozone and its precursors in a chemistry-climate model, doi
  14. (2000). Data composites of airborne observations of tropospheric ozone and its precursors, doi
  15. (1996). Further estimates of radiative forcing due to tropospheric ozone, doi
  16. (1999). Validation and intercomparison of wet and dry deposition schemes using 210Pb in a global three-dimensional off-line chemical transport model, doi
  17. (1990). A mass flux convection scheme with representation of cloud ensemble characteristics and stability dependent closure, doi
  18. (2001). Chemistryclimate interactions in the Goddard Institute for Space Studies general circulation model 2, New insights into modeling the preindustrial atmosphere, doi
  19. (1995). A global model of natural volatile organic-compound emissions, doi
  20. (1994). The importance of atmospheric chemistry in the calculation of radiative forcing on the climate system, doi
  21. (2001). Evolution of tropospheric ozone under anthropogenic activities and associated radiative forcing of climate, doi
  22. (2005). Future tropospheric ozone simulated with a climatechemistry-biosphere model, doi
  23. (2001). Climate Change 2001: The Scientific Basis, doi
  24. (2003). Anthropogenic climate change for 1860 to 2100 simulated with the HadCM3 model under updated emissions scenarios,
  25. (1999). Relative roles of climate and emissions changes on future tropospheric oxidant concentrations, doi
  26. (2005). Impact of climate change on surface ozone and deposition of sulphur and nitrogen in doi
  27. (2005). Past and future changes in biogenic volatile organic compound emissions simulated with a global dynamic vegetation model, doi
  28. (1993). Modeling trace gas budgets in the troposphere, 1. Ozone and odd nitrogen, doi
  29. (1998). Evaluation of modeled O3 using Measurement of Ozone by Airbus In-Service Aircraft (MOZAIC) data, doi
  30. (1940). The balance of effects of deep convective mixing on tropospheric ozone,
  31. (1995). A 4-D ozone climatology for UGAMP models, UGAMP internal report,
  32. (1999). An analysis of ozonesonde data for the troposphere: Recommendations for testing 3-D models and development of a grided climatology for tropospheric ozone, doi
  33. (1999). Radiative forcing from tropospheric ozone calculated with a unified chemistry-climate model, doi
  34. (1989). Isoprene emission from aspen leaves: Influence of the environment and relation to photosynthesis and phptorespiration, doi
  35. (2006). How does climate change contribute to surface ozone change over the United States?, doi
  36. (2000). et al.: Special Report on Emission Scenarios,
  37. Global emissions sources and sinks, in: The Climate System, edited by:
  38. (2005). The interacting effects of elevated atmospheric CO2 concentration, drought and leaf-to-air vapour pressure deficit on ecosystem isoprene fluxes, doi
  39. (2008). Development and intercomparison of condensed isoprene oxidation Atmos.
  40. (1992). A simple lightning parameterization for calculating global lightning distributions, doi
  41. (1994). Modelling global lightning distributions in a general circulation model, doi
  42. (1983). Some contributions to the modelling of discontinuous flow, in: Lectures in applied mathematics, “Large-Scale computations in fluid mechanics”,(AMS-SIAM summer seminar,
  43. (1997). R: A threedimensional chemistry/general circulation model simulation of anthropogenically derived ozone in the troposphere and its radiative climate forcing, doi
  44. (2003). IncreasedCO2 uncouplesgrowthfromisopreneemission in an agriforest ecosystem, doi
  45. (1936). Effect of climate change on isoprene emissions and surface ozone levels, doi
  46. (2000). B: The time-dependence of climate sensitivity, doi
  47. (1996). Field measurements of isoprene emission from trees in response to temperature and light, doi
  48. (2001). Chemistry-climate interactions in the Goddard Institute for Space Studies general circulation model 1. Tropospheric chemistry model description and evaluation, doi
  49. (2006). Simulations of preindustrial, present-day, and 2100 conditions in the NASA GISS composition and climate model G-PUCCINI, doi
  50. (1996). Two parametrizations of the dry deposition exchange for SO2 and NH3 in a numerical model, doi
  51. (1998). Evolution of tropospheric ozone radiative forcing, doi
  52. (1998). Intercomparison and evaluation of atmospheric transport in a Lagrangian model (STOCHEM), and an Eulerian model (UM), using 222Rn as a short-lived tracer, doi
  53. (2000). Future estimates of tropospheric ozone radiative forcing and methane turnover - the impact of climate change, doi
  54. (2005). Impacts of climate change and variability on tropospheric ozone and its precursors, doi
  55. (2006). Multimodel ensemble simulations of present-day and nearfuture tropospheric ozone,
  56. (2003). Future changes in stratosphere-troposphere exchange and their impacts on future tropospheric ozone simulations, doi
  57. (1992). M.:The oxidizing capacity of the Earth’s atmosphere: Probable past and future changes, doi
  58. (1990). Numerical modeling of the climatological and anthropogenic influences on the chemical composition of the troposphere since the last glacial maximum,
  59. (2003). Carbon emissions from fires in tropical and subtropical ecosystems, doi
  60. (1988). Evaluation of the Montsouris series of ozone measurements made in the nineteenth century, doi
  61. (2006). Future changes in biogenic isoprene emissions: How might they affect regional and global atmospheric chemistry?, doi
  62. (2007). Why are there large differences between models in global budgets of tropospheric ozone?, doi
  63. (1995). Empirical model of global soil-biogenic NOx emissions, doi
  64. (2007). The influence of biogenic isoprene emissions on atmospheric chemistry: A model study for present and future atmospheres,
  65. (2000). Changes in tropospheric ozone between doi
  66. (2005). Influence of El Ni˜ no southern oscillation on stratosphere/troposphere exchange and the global tropospheric ozone budget, doi
  67. (2003). A revised parameterization for gaseous dry deposition in air-quality models, doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.