Global measurements and modeling of 4.3 um NLTE using AIRS

S. De Souza-Machado; L. L. Strow; S. E. Hannon; M. Lopez-Puertas; B. Funke; D. P. Edwards

doi:10.1117/12.690076

11 October 2006 Global measurements and modeling of 4.3 um NLTE using AIRS

S. De Souza-Machado, L. L. Strow, S. E. Hannon, M. Lopez-Puertas, B. Funke, D. P. Edwards

Proceedings Volume 6362, Remote Sensing of Clouds and the Atmosphere XI; 63620N (2006) https://doi.org/10.1117/12.690076
Event: SPIE Remote Sensing, 2006, Stockholm, Sweden

Abstract

The Atmospheric Infrared Sounder (AIRS) has been operating since Sept. 2002 and is being used operationally by several weather centers. Routine retrieval processing is done by NASA. Daytime AIRS measurements in the 4.3um region show large (upto 12 K) brightness temperature shifts compared to nighttime observations. The daytime shifts result from the preferential absorption of solar radiance in the upper atmosphere by CO2 and other molecules. This energy is transferred to many of the 4 um CO2 bands, driving them into a state of Non-Local Thermodynamic Equilibrium (NLTE). We present comparisons of observations against the results of a Fast Model we developed for the AIRS instrument, that includes this effect. This algorithm is fast enough to be used for retrievals, and will be especially useful for the 4.3um R branch head channels that are used for temperature sounding.

Citation Download Citation

S. De Souza-Machado, L. L. Strow, S. E. Hannon, M. Lopez-Puertas, B. Funke, and D. P. Edwards "Global measurements and modeling of 4.3 um NLTE using AIRS", Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 63620N (11 October 2006); https://doi.org/10.1117/12.690076

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