Extending MGS-TES temperature retrievals in the martian atmosphere up to 90km: Retrieval approach and results

Kutepov, A. A.; Rezac, Ladislav; Smith, M. D.

doi:10.1016/j.icarus.2012.09.033

Cited by 25 publications

(2 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper the CO 2 non-LTE populations and limb spectra are calculated using the ALI-ARMS (for Accelerated Lambda Iterations for Atmospheric Radiation and Molecular Spectra) non-LTE code package (Kutepov et al, 1998;Gusev and Kutepov, 2003;Feofilov and Kutepov, 2012). ALI-ARMS utilizes the accelerated lambda iteration (ALI) technique developed in stellar astrophysics (Werner, 1986(Werner, , 1987Rybicki and Hummer, 1991;Pauldrach et al, 1994Pauldrach et al, , 2001Pauldrach, 2003;Hubeny and Lanz, 2003) for calculating the non-LTE populations of a very large number of atomic and ionic levels in optically thick atmospheres.…”

Section: The Ali-arms Codementioning

confidence: 99%

“…ALI has became a standard technique for spectrum formation calculations and for the computation of the non-LTE model stellar atmospheres. The ALI-ARMS code has been successfully applied to the diagnostics of a number of space infrared Earth's and Martian observations, both spectrally resolved (Kaufmann et al, 2002;Kaufmann et al, 2003;Maguire et al, 2002;Gusev et al, 2006) and broadband signals (Kutepov et al, 2006;Feofilov et al, 2009Feofilov et al, , 2012Rezac et al, 2015), as well as to study the infra-red radiative cooling/heating in planetary atmospheres (Hartogh et al, 2005;Kutepov et al, 2007;Feofilov and Kutepov, 2012).…”

Section: The Ali-arms Codementioning

confidence: 99%

See 1 more Smart Citation

Evidence of a significant rotational non-LTE effect in the CO<sub>2</sub> 4.3 μm PFS-MEX limb spectra

Kutepov¹,

Rezac²

2016

Preprint

View full text Add to dashboard Cite

Abstract. Since January 2004, the planetary Fourier spectrometer (PFS) on board the Mars Express satellite has been recording near infrared limb spectra of high quality up to &approx; 150 km, with potential information on density and thermal structure of the upper atmosphere. We present first results of our modeling of the PFS short wavelength channel (SWC) daytime limb spectra for the altitude region above 90 km. We applied a ro-vibrational non-LTE model based on the stellar astrophysics technique of accelerated lambda 5 iteration (ALI) to solve the multi-species and multi-level CO2 problem in the Martian atmosphere. We show that the long standing discrepancy between observed and calculated spectra in the cores and wings of 4.3 μm region is explained by the non-thermal rotational distribution of molecules in the upper vibrational states 10011 and 10012 of the CO2 main isotope second hot (SH) bands above 90 km altitude. The redistribution of SH band intensities from band branch cores into their wings is caused (a) by intensive production of the CO2 molecules in rotational states with j > 30 due to the absorption 10 of solar radiation in optically thin wings of 2.7 μm bands, and (b) by a short radiative life time of excited molecules, which is insufficient at altitudes above 90 km for collisions to maintain rotation of excited molecules thermalized. Implications for developing operational algorithms for massive processing of PFS and other instrument limb observations are discussed.

show abstract

Section: The Ali-arms Codementioning

confidence: 99%

Section: The Ali-arms Codementioning

confidence: 99%

Evidence of a significant rotational non-LTE effect in the CO<sub>2</sub> 4.3 μm PFS-MEX limb spectra

Kutepov¹,

Rezac²

2016

Preprint

View full text Add to dashboard Cite

show abstract

Infrared Radiation in the Mesosphere and Lower Thermosphere: Energetic Effects and Remote Sensing

Feofilov

Kutepov

2012

Surv Geophys

View full text Add to dashboard Cite

International audienceThis paper discusses the formation mechanisms of infrared radiation in the mesosphere and lower thermosphere (MLT), the energetic effects of the radiative absorption/emission processes, and the retrieval of atmospheric parameters from infrared radiation measurements. In the MLT and above, the vibrational levels of the molecules involved in radiative transitions are not in local thermodynamic equilibrium (LTE) with the surrounding medium, and this then requires specific theoretical treatment. The non-LTE models for CO2, O3, and H2O molecules are presented, and the radiative cooling/heating rates estimated for five typical atmospheric scenarios, from polar winter to polar summer, are shown. An optimization strategy for calculating the cooling/heating rates in general circulation models is proposed, and its accuracy is estimated for CO2. The sensitivity of the atmospheric quantities retrieved from infrared observations made from satellites to the non-LTE model parameters is shown. © 2012 Springer Science+Business Media Dordrecht

show abstract

Convective instabilities during Mars Climate Sounder’s limb staring mode were overestimated

Edmonds¹,

Murphy²,

Schofield³

et al. 2014

Icarus

View full text Add to dashboard Cite

Extending MGS-TES temperature retrievals in the martian atmosphere up to 90km: Retrieval approach and results

Cited by 25 publications

References 42 publications

Evidence of a significant rotational non-LTE effect in the CO<sub>2</sub> 4.3 μm PFS-MEX limb spectra

Evidence of a significant rotational non-LTE effect in the CO<sub>2</sub> 4.3 μm PFS-MEX limb spectra

Infrared Radiation in the Mesosphere and Lower Thermosphere: Energetic Effects and Remote Sensing

Convective instabilities during Mars Climate Sounder’s limb staring mode were overestimated

Contact Info

Product

Resources

About

Extending MGS-TES temperature retrievals in the martian atmosphere up to 90km: Retrieval approach and results

Cited by 25 publications

References 42 publications

Evidence of a significant rotational non-LTE effect in the CO&lt;sub&gt;2&lt;/sub&gt; 4.3 μm PFS-MEX limb spectra

Evidence of a significant rotational non-LTE effect in the CO&lt;sub&gt;2&lt;/sub&gt; 4.3 μm PFS-MEX limb spectra

Infrared Radiation in the Mesosphere and Lower Thermosphere: Energetic Effects and Remote Sensing

Convective instabilities during Mars Climate Sounder’s limb staring mode were overestimated

Contact Info

Product

Resources

About

Evidence of a significant rotational non-LTE effect in the CO<sub>2</sub> 4.3 μm PFS-MEX limb spectra

Evidence of a significant rotational non-LTE effect in the CO<sub>2</sub> 4.3 μm PFS-MEX limb spectra