Theoretical and Observational Studies of Mesospheric Responses to Short-term UV Variability

Details Theoretical and Observational Studies of Mesospheric Responses to Short-term UV Variability Theoretical and Observational Studies of Mesospheric Responses to Short-term UV Variability

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0716t&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0716

Other

0340 Middle Atmosphere: Composition And Chemistry, 0342 Middle Atmosphere: Energy Deposition, 1650 Solar Variability, 7538 Solar Irradiance

Scientific paper

The majority of the solar UV flux is absorbed in the middle atmosphere and the more variable radiances of extreme ultraviolet and Lyman-α are absorbed in the mesosphere and lower thermosphere (MLT), inducing significant changes in MLT chemistry and dynamics. Analyses of satellite measurements have shown clear correlations between the solar UV irradiance variations and mesospheric ozone and temperature that have not yet been satisfactorily reproduced by model simulations. Using the JHU/APL 1D and 2D chemical/dynamical/radiative models we are able to couple the diurnally forced photochemistry and the vertical transport at fast timescales. Results of the model analyses show that the interpretation of the chemical response to UV forcing has a strong local-time dependence in tracer distribution, including mesospheric ozone. In this paper we present the sensitivity of variation in ozone and other chemical species to short term variations in solar UV forcing, especially with respect to local time. This study provides insight into the interpretation of previous ozone/UV variability studies and guidance for analysis of observational data. Furthermore, we present preliminary results of correlative studies of mesospheric responses to solar UV variabilities (and their local time dependence) using measured temperature, minor species concentrations, and solar irradiance data.

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