Physics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..333f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 4, p. 333-365
Physics
73
Atmospheric Composition, Atmospheric Models, Middle Atmosphere, Photochemical Reactions, Solar Cycles, Solar Radiation, Twenty-Seven Day Variation, Two Dimensional Models, Ultraviolet Radiation, Atmospheric Temperature, Hydroxyl Radicals, Latitude, Ozone, Vertical Distribution, Water Vapor
Scientific paper
We have investigated the middle atmospheric response to the 27-day and 11-yr solar UV flux variations at low to middle latitudes using a two-dimensional photochemical model. The model reproduced most features of the observed 27-day sensitivity and phase lag of the profile ozone response in the upper stratosphere and lower mesosphere, with a maximum sensitivity of +0.51% per 1% change in 205 nm flux. The model also reproduced the observed transition to a negative phase lag above 2 mb, reflecting the increasing importance with height of the solar modulated HO(x) chemistry on the ozone response above 45 km. The model revealed the general anti-correlation of ozone and solar UV at 65-75 km, and simulated strong UV responses of water vapor and HO(x) species in the mesosphere. Consistent with previous 1D model studies, the observed upper mesospheric positive ozone response averaged over +/- 40 was simulated only when the model water vapor concentrations above 75 km were significantly reduced relative to current observations. In agreement with observations, the model computed a low to middle latitude total ozone phase lag of +3 days and a sensitivity of +0.077% per 1% change in 205 nm flux for the 27-day solar variation, and a total ozone sensitivity of +0.27% for the 11-yr solar cycle. This factor of 3 sensitivity difference is indicative of the photochemical time constant for ozone in the lower stratosphere which is comparable to the 27-day solar rotation period but is much shorter than the 11-yr solar cycle.
Chandra Sushil
Considine David B.
Douglass Anne R.
Fleming Eric L.
Jackman Charles H.
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