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Influence of energetic particle precipitation on stratospheric ozone and climate

(M. Calisto, E. Rozanov, T. Peter)

A mechanism of how the observed Sun-Earth relationship is operating is related to ozone photochemistry in the stratosphere. Induced ozone gradients in the stratosphere affect circulation patterns. Variability of solar irradiance leads to variability of ozone in the stratosphere (e.g. Rozanov et al., 2002). During solar maximum the enhanced UV radiation results in enhanced oxygen photolysis, which in turn results in increased ozone in the stratosphere. This results in heating of the tropical summer-hemispheric stratosphere. Thus the temperature difference increases between the tropics and the winter hemisphere high-latitudes which results in intensification of the Polar Night Jet and the alteration of the upward propagation of planetary wave paths. This results in alteration of the Hadley-cell position and strength and to changes of surface air temperatures similar to the positive phase of the Arcitic Oscillation (Thompson & Wallace, 1998; Rozanov et al., 2004; Egorova et al., 2004).

Several 20-year long steady state simulations for the minimum and maximum solar activity case will be performed containing NOx and HOx produced by energetic particles. A transient run from 1976 to 2005 will be done with all energetic particles to find whether the solar signal could be better simulated with this process included.

References

Egorova, T., E. Rozanov, E. Manzini, M. Haberreiter, W. Schmutz, V. Zubov and T. Peter (2004) Chemical and dynamical response to the 11-year variability of the solar irradiance simulated with a chemistry-climate model. Geophys. Res. Lett. 31, L06119, doi:10.1029/ 2003GL019294

Rozanov, E. V., M. E. Schlesinger, N. G. Andronova, F. Yang, S. L. Malyshev, V. A. Zubov, T. A. Egorova and B. Li (2002) Climate/chemistry effects of the Pinatubo volcanic eruption simulated by the UIUC stratosphere/troposphere GCM with interactive photochemistry. J. Geophys. Res. 107, 4594, doi:10.1029/ 2001JD000974.

Rozanov, E. V., M. E. Schlesinger, T. A. Egorova, B. Li, N. Andronova and V.A. Zubov (2004) Atmospheric response to the observed increase of solar UV radiation from solar minimum to solar maximum simulated by the UIUC Climate-Chemistry Model. J. Geophys. Res. 109, D01110, doi:10.1029/2003JD003796.

Thompson D.W.J. and J.M. Wallace (1998) The arctic oscillation signature in the wintertime geopotential height and temperature fields. Geophys. Res. Lett., 25(9), 1297.

 

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