Transport Processes in the Stratosphere and Troposphere

Transport of air across the tropopause plays an important role in determining the chemical composition, and hence radiative properties, of both the troposphere and stratosphere. Quantifying this transport presents a significant challenge on account of the many multiscale processes involved from the global scale mean meridional circulation, through intermediate advective and convective processes, to molecular diffusion. It has long been recognized that tropospheric air enters the stratosphere principally in the tropics, and moves poleward in the stratosphere.

To understand the large-scale circulation in the troposphere and stratosphere, it is useful to look at transport processes averaged around a latitude circle. Ozone productionmainly takes place in the tropical stratosphere as the direct solar radiation photodissociates oxygenmolecules (O2) into oxygen atoms (O), which quickly react with other O2 molecules to form ozone (O3). But most ozone is found in the higher latitudes rather than in the tropics, i.e., outside of its natural tropical stratospheric source region. This higher-latitude ozone results from the slow atmospheric circulation that moves ozone from the tropics where it is produced into the middle and polar latitudes. This slow circulation is known as the Brewer-Dobson circulation.

Keywords

Vortex Convection Transportation Ozone Chlorine 

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References

  1. Austin J, Li F (2006) On the relationship between the strength of the Brewer Dobsun circulation and the age of stratospheric air, Geophys Res Lett, 33, doi 10.1029/2006GL026867Google Scholar
  2. Appenzeller C, Holton JR, Rosenlof KH (1996) Seasonal variation of mass transport across the tropopause, J Geophys Res 101: 15071–15078CrossRefGoogle Scholar
  3. Brasseur G, Solomon S (2005) Aeronomy of the Middle Atmosphere, 3rd edition Springer, DordrechtGoogle Scholar
  4. Bonazzola M, Haynes PH (2004) A trajectory based study of the tropical tropopause region, J Geophys Res, 109 doi 10.1029/2003JD004536Google Scholar
  5. Butchart N, Scaife AA, Bourqui M, de Grandpre J, Hare SHE, Kettleborough J, Langematz U, Manzini E, Sassi F, Shibata K, Shindell D, Sigmond M (2006) Simulations of anthropogenic change in the strength of the Brewer Dobson circulation, Clim Dyn, 27, 727–741, doi 10.1007/s00382-006-0612-4CrossRefGoogle Scholar
  6. Cordero E, Newman PA, Weaver C, Fleming E (2002) Stratospheric dynamics and transport of ozone and other tracer gases, Chapter 6: Stratospheric Ozone An Electronic Text, NASA, GSFCGoogle Scholar
  7. Cox ME, Haynes P (2003) Scientific assessment of ozone depletion: 2002, WMO Report No. 47., Geneva, SwitzerlandGoogle Scholar
  8. Eichelberger SJ, Hartmann D (2005) Changes in the strength of the Brewer Dobson circulation in a simple AGCM, Geophys Res Lett, 33, doi 10.1029/2005GL022924Google Scholar
  9. Finlayson-Pitts BJ, Pitts JN Jr (2000) Chemistry of the upper and lower atmosphere, Academic, London, 2000Google Scholar
  10. Gettleman A, Foster PMdeF (2002) A climatology of the tropical tropopause layer, J Meteorol Soc Japan, 80, 911–924CrossRefGoogle Scholar
  11. Holton JR, Haynes PH, McIntyre ME, Douglas AR, Rood RB, Pfister L (1995) Stratosphere troposphere exchange, Rev. Geophys 33: 403–439CrossRefGoogle Scholar
  12. NASA (2003) Studying Earth’s Environment from Space (http://www.ccpo.odu.edu/SEES/index.html)
  13. Perlwitz J, Harnik N (2004) Downward coupling between the stratosphere and troposphere: The relative role of wave and aonal mean processes, J Clim, 17: 4902–4909CrossRefGoogle Scholar
  14. Rind D, Lerner J, McLinden C (2001) Changes of tracer distributions in the doubled carbon dioxide climate, J Geophys Res, 106: 28061–28080CrossRefGoogle Scholar
  15. Scott RK, Polvani LM (2004) Stratospheric control of upward wave flux near the tropopause, Geophys Res Lett, 31, doi 10.1029/2003GL017965.1Google Scholar
  16. Shepherd TG (1997) Transport and mixing in the lower stratosphere: a review of recent developments, SPARC Newsletter 9, July 1997Google Scholar
  17. Shepherd TG (2002) Issues in stratospheric tropospheric coupling, J Meteorol Soc Japan, 80: 769–792CrossRefGoogle Scholar
  18. Sherwood SC, Dessler AE (2001) A model for transport across the tropopause, J Atmos Sci, 58: 765–779CrossRefGoogle Scholar
  19. Stohl A, Wernli H, James P, Bourqui M, Forster C, Liniger MA, Seibert P, Sprenger M (2003) A new perceptive of the stratosphere-trposphere exchange, Bull Amer Meterol Soc, 84, 1565–1573CrossRefGoogle Scholar
  20. Trenberth KE, Stepaniak DP (2003) Seamless poleward atmospheric energy transports and implications for the Hadley circulation, J Climate 16: 3705–3721Google Scholar
  21. Waugh DW, Hall TM (2002) Age of stratospheric air: Theory, observations, and modeling, Rev Geophys, 40, doi. 10.1029/2000R000101Google Scholar
  22. WMO (2007): Scientific Assessment of Ozone Depletion: 2006, Global ozone research and monitoring project Report No. 50, Geneva, SwitzerlandGoogle Scholar

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