The SABER Instrument on the TIMED Mission: Evidence for an OH(v) Excitation Mechanism from CO2 4.3-μ m Nighttime Measurements

Details The SABER Instrument on the TIMED Mission: Evidence for an OH(v) Excitation Mechanism from CO2 4.3-μ m Nighttime Measurements The SABER Instrument on the TIMED Mission: Evidence for an OH(v) Excitation Mechanism from CO2 4.3-μ m Nighttime Measurements

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa51a..06l&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA51A-06

Physics

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

Scientific paper

The SABER instrument on the TIMED satellite is currently measuring the CO2(ν 3) nighttime limb radiance at 4.3 μ m from the lower stratosphere to the lower thermosphere, near-globally and with a very high signal-to-noise ratio. We present a preliminary analysis of some representative scans by comparing them with model simulations. Existing models generally underpredict the measured nighttime radiance in the upper mesosphere and lower thermosphere, especially if the role of excited OH is neglected. OH(v) is thought to transfer energy to N2 (v=1), and hence to CO2(ν 3), a mechanism proposed by Kumer et al. (1978), but the rate at which this occurs is not well known. Direct OH(v) emissions in the 9-8 and 8-7 bands also fall within the 4.3-μ m bandpass, but account for only a small part of typical discrepancies. We investigate the extent to which this mechanism is capable of accounting for the model underprediction and consider alternative mechanisms that may enhance the nighttime limb radiance in the mesosphere. The ability to unravel the roles of processes impacting the nighttime radiance is facilitated by the quality and uniqueness of the SABER data set, providing low-noise 4.3-μ m radiance data, temperature, and pressure, as well as OH(v) populations from its two OH channels.

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