Computer Science – Sound
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa24a..06s&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA24A-06
Computer Science
Sound
0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry, 0360 Radiation: Transmission And Scattering, 3359 Radiative Processes, 3394 Instruments And Techniques
Scientific paper
Satellite measurements of mesospheric water vapor provide important constraints to global-scale dynamical models of the Earth's upper atmosphere. One measurement approach is to observe hydroxyl (OH) prompt emission between 300-330 nm, which can be produced directly from the photolysis of water vapor by solar Lyman-α. Identification of this relatively weak non-thermal emission requires a rigorous understanding of the Earth's airglow between 300-330 nm, including the spectrally complex Rayleigh scattered background and OH(0,0) solar resonance fluorescence. Here we present the first satellite observations of mesospheric OH prompt emission from two limb sounding experiments: the Middle Atmosphere High Resolution Spectrograph Investigation (MAHRSI) and the Optical Spectrograph and Infra-Red Imaging System (OSIRIS). MAHRSI flew twice on a satellite deployed and retrieved by the space shuttle in 1994 and 1997, measuring OH(0,0) solar resonance fluorescence near 309 nm at a spectral resolution of 0.02 nm. OSIRIS was launched on the Odin satellite in 2001 and the airglow measurements between 280-810 nm include both OH(0,0) and (1,1) solar fluorescence at a lower spectral resolution of 1 nm. We will compare the two sets of OH prompt observations under similar geophysical conditions, retrieve vertical profiles of water vapor and compare them to other available water vapor measurements. Emphasis will be placed on the potential of this technique compared with other more traditional approaches to measuring mesospheric water vapor.
Degenstein Douglas Arthur
Gattinger Richard L.
Gumbel Jörg
Khaplanov Mikhail
Llewellyn Edam J.
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