Middle atmosphere response to the solar cycle in irradiance and ionizing particle precipitation

by K. Semeniuk, V. I. Fomichev, J. C. McConnell, C. Fu, S. M L Melo, I. G. Usoskin
Atmospheric Chemistry and Physics ()


The impact of NO(x) and HO(x) production by three types of energetic particle precipitation (EPP), auroral zone medium and high energy electrons, solar proton events and galactic cosmic rays on the middle atmosphere is examined using a chemistry climate model. This process study uses ensemble simulations forced by transient EPP derived from observations with one-year repeating sea surface temperatures and fixed chemical boundary conditions for cases with and without solar cycle in irradiance. Our model results show a wintertime polar stratosphere ozone reduction of between 3 and 10% in agreement with previous studies. EPP is found to modulate the radiative solar cycle effect in the middle atmosphere in a significant way, bringing temperature and ozone variations closer to observed patterns. The Southern Hemisphere polar vortex undergoes an intensification from solar minimum to solar maximum instead of a weakening. This changes the solar cycle variation of the Brewer-Dobson circulation, with a weakening during solar maxima compared to solar minima. In response, the tropical tropopause temperature manifests a statistically significant solar cycle variation resulting in about 4% more water vapour transported into the lower tropical stratosphere during solar maxima compared to solar minima. This has implications for surface temperature variation due to the associated change in radiative forcing.

Cite this document (BETA)

Readership Statistics

10 Readers on Mendeley
by Discipline
by Academic Status
30% Researcher (at an Academic Institution)
30% Post Doc
10% Researcher (at a non-Academic Institution)
by Country
10% India
10% South Africa
10% Canada

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in