Computer Science – Sound
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa33a..06s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA33A-06
Computer Science
Sound
[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry
Scientific paper
Mesospheric ozone photochemistry is primarily dominated by a catalytic loss cycle involving odd hydrogen (HOx). In principal, this comparatively simple chemistry could be tested with simultaneous comparison of a model with ozone and odd hydrogen data. Until recently, such comparisons could not be made because such simultaneous data did not exist. However, with the recent conclusion of the successful 30 month mission of The Spatial Heterodyne Image for Mesospheric Radicals (SHIMMER) on a Space Test Program satellite (STPSat-1) , we now have the data with which to perform these studies. SHIMMER made high quality, high vertical resolution measurements measurements of hydroxyl (OH) from 60-80 km for a wide range of local times. The ozone data comes from measurements made by the Sounding of the Atmosphere with Broadband Emission Radiometry (SABER) on the NASA TIMED satellite. Since TIMED and STPSat observed the atmosphere simultaneously but at different local times, these OH and ozone data are studied using a diurnal photochemical model as a "transfer standard" that was sampled for lighting conditions appropriate to each experiment. We have used the eddy diffusion coefficient as a free parameter to be constrained by the model-data comparison. The results suggest very good general agreement with SHIMMER OH, except for a puzzling overestimate by the model of the data in the late afternoon at the highest altitudes. By contrast, the comparison with SABER ozone shows persistent large discrepancies whereby the model falls below the data; reasons for this will be offered.
Englert Christoph R.
Marsh Daniel R.
Siskind David E.
Stevens Michael Hugh
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