OH and O3 in the MLT: Comparing MAHRSI and ORA measurements With the SOCRATES 2D-model

Details OH and O3 in the MLT: Comparing MAHRSI and ORA measurements With the SOCRATES 2D-model OH and O3 in the MLT: Comparing MAHRSI and ORA measurements With the SOCRATES 2D-model

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0710c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0710

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0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

New space-based measurements of two key chemical species in the MLT, OH and O3\ , were recently published. The OH radical was measured for the first time in the stratosphere and the mesosphere by the MAHRSI instrument. Conway et al. [2000] showed the difficulty to explain these observations with a one-dimensional model. Ozone measurements were extracted from the ORA instrument, which uses solar occultation in the UV-visible wavelength range. More than 2500 vertical profiles of O3 at sunrise and sunset were obtained, up to 110 km altitude. This is the first ozone data set to extend above the mesopause, capturing the ozone secondary maximum in its totality. We compare these measurements with the results of the SOCRATES two-dimensional interactive model. The latest version of this model includes, among other improvements, an accurate calculation of the absorption of the Lyman-α solar line by O2\ , molecular diffusion, and a parameterization of the gravity wave drag to accurately match the observed temperature distribution in the MLT - especially the temporal and spatial structure of the mesopause. We show that the observations of mesospheric OH and O3 in the MLT are reproduced in a very satisfactory manner using this new multi-dimensional model.

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