Articles | Volume 10, issue 1
Atmos. Meas. Tech., 10, 265–271, 2017
https://doi.org/10.5194/amt-10-265-2017
Atmos. Meas. Tech., 10, 265–271, 2017
https://doi.org/10.5194/amt-10-265-2017

Research article 24 Jan 2017

Research article | 24 Jan 2017

Evidence of a significant rotational non-LTE effect in the CO2 4.3 µm PFS-MEX limb spectra

Alexander A. Kutepov et al.

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Cited articles

Feofilov, A. G. and Kutepov, A. A.: Infrared Radiation in the Mesosphere and Lower Thermosphere: Energetic Effects and Remote Sensing, Surv. Geophys, 33, 1231–1280, https://doi.org/10.1007/s10712-012-9204-0, 2012.
Feofilov, A. G., Kutepov, A. A., Pesnell, W. D., Goldberg, R. A., Marshall, B. T., Gordley, L. L., García-Comas, M., López-Puertas, M., Manuilova, R. O., Yankovsky, V. A., Petelina, S. V., and Russell III, J. M.: Daytime SABER/TIMED observations of water vapor in the mesosphere: retrieval approach and first results, Atmos. Chem. Phys., 9, 8139–8158, https://doi.org/10.5194/acp-9-8139-2009, 2009.
Feofilov, A. G., Kutepov, A. A., Rezac, L., and Smith, M. D.: Extending MGS-TES temperature retrievals in the martian atmosphere up to 90 km: Retrieval approach and results, Icarus, 221, 949–959, 2012.
Formisano, V., Maturilli, A., Giuranna, M., D'Aversa, E., and López-Valverde, M.: Observations of non-LTE emission at 4–5 microns with the planetary Fourier spectrometer abord the Mars Express mission, Icarus, 182, 51–67, 2006.
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Short summary
We show that the long-standing discrepancy between observed and calculated spectra of the PFS/MEx in the cores and wings of 4.3-micron region is explained by the non-thermal rotational distribution of molecules in the upper vibrational states of second hot (SH) CO2 bands above 90 km altitude. We discuss the implications that accounting for this effect has for developing operational algorithms aimed at massive processing of PFS and other instrument limb observations.