Analysis of the SABER 4.3-μ m Nighttime Radiance and Implications for the Temperature and CO2 vmr Retrieval

Details Analysis of the SABER 4.3-μ m Nighttime Radiance and Implications for the Temperature and CO2 vmr Retrieval Analysis of the SABER 4.3-μ m Nighttime Radiance and Implications for the Temperature and CO2 vmr Retrieval

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa41a1043g&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA41A-1043

Computer Science

Sound

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument measures the CO2 4.3-μ m nighttime emission with a signal-to-noise ratio which equals to 1 at 130 km. These measurements can be used to derive the carbon dioxide abundance above 75 km during nighttime. CO2 abundance is needed not only to understand the energy balance of the MLT region but also to accurately derive the kinetic temperature in that region from the measurements taken at 15-μ m. However, the nighttime non-LTE mechanisms affecting the 4.3-μ m CO2 vibrational state population are not well known and therefore CO2 abundance cannot still be accurately retrieved from SABER measurements at night. The analysis of SABER nighttime measurements at 4.3-μ m presented here shows that the radiance is reproduced only if an efficient energy transfer from OH to CO2 via N2 , whereby 2.8-3 N2(1) molecules are excited after quenching of one OH(υ), is considered. We also present the implications of including such a process in the simultaneous Tk/CO2 retrieval results.

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