Search Publications
Magnetic dipole and electric quadrupole absorption in carbon dioxide
Montmessin, F.; Fedorova, A.; Korablev, O. I. +3 more
Magnetic dipole and electric quadrupole absorption in carbon dioxide are addressed in details. The selection rules for both processes are presented. The equations for the line intensities are given. In the case of the quadrupole absorption the Herman-Wallis functions are derived. The results of the present paper were used in the analysis of the ca…
Machine learning for automatic identification of new minor species
Erwin, Justin; Daerden, Frank; Ristic, Bojan +9 more
One of the main difficulties to analyze modern spectroscopic datasets is due to the large amount of data. For example, in atmospheric transmittance spectroscopy, the solar occultation channel (SO) of the NOMAD instrument onboard the ESA ExoMars2016 satellite called Trace Gas Orbiter (TGO) had produced ~ 10 millions of spectra in ~ 20000 acquisitio…
The RISOTTO radiative transfer and retrieval pipeline for the analysis of occultation spectra
Montmessin, F.; Ferron, S.; Braude, A. S.
We present a new radiative transfer and retrieval pipeline, referred to as RISOTTO, designed for observations made in occultation geometry. RISOTTO can retrieve accurate vertical profiles of the constituents of a planetary atmosphere using a Bayesian approach while simultaneously correcting for instrumental artefacts and uncertainties. The algorit…
Validation of the HITRAN 2016 and GEISA 2015 line lists using ACE-FTS solar occultation observations
Montmessin, F.; Korablev, O.; Fedorova, A. A. +4 more
The ExoMars Trace Gas Orbiter (TGO) began its nominal science phase at Mars in April 2018, following releases of editions to two major spectroscopic line lists: GEISA 2015 (Gestion et Etude des Informations Spectroscopiques Atmosphériques: Management and Study of Atmospheric Spectroscopic Information), and HITRAN 2016 (High Resolution Transmission…
Planetary Spectrum Generator: An accurate online radiative transfer suite for atmospheres, comets, small bodies and exoplanets
Villanueva, G. L.; Smith, M. D.; Faggi, S. +2 more
We have developed an online radiative-transfer suite (https://psg.gsfc.nasa.gov) applicable to a broad range of planetary objects (e.g., planets, moons, comets, asteroids, TNOs, KBOs, exoplanets). The Planetary Spectrum Generator (PSG) can synthesize planetary spectra (atmospheres and surfaces) for a broad range of wavelengths (UV/Vis/near-IR/IR/f…
Two test-cases for synergistic detections in the Martian atmosphere: Carbon monoxide and methane
Vandaele, A. C.; Daerden, F.; Robert, S. +5 more
In the frame of the scientific preparation of ExoMars Trace Gas Orbiter (EMTGO), synergistic retrievals were performed on synthetic spectra of two different remote sensing instruments of the Martian atmosphere. To benefit from their diversity, we have simulated spectra of a Fourier transform spectrometer (FTS), working in the middle to far infrare…
Potential infrared relaxation channels calculated for CO2 clathrate hydrates
Lakhlifi, Azzedine; Dahoo, Pierre Richard; Chassefière, Eric
The infrared bar-spectrum of a single carbon dioxide molecule encapsulated in nano-cage clathrate hydrate is determined using the LD (Lakhlifi-Dahoo) extended site inclusion model successfully applied to analyze the spectra of CO2 isotopologues isolated in rare gas matrices. Trapping is energetically more favorable in clathrate structur…