Carbon dioxide clathrate hydrate FTIR spectrum

Dartois, E.; Schmitt, Bernard

doi:10.1051/0004-6361/200911812

Cited by 47 publications

(46 citation statements)

References 39 publications

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“…exist [Chassefière, 2009], but have not been observed and are not expected to form localized clouds as they would originate from the subsurface where the pressure is high enough for their formation. Spectral signatures of such clathrate hydrate particles (methane clathrate, CO 2 clathrate) will be dominated by their main component: water ice [Schmitt et al, 2003;Dartois and Schmitt, 2009]. Micrometeorites, which spectral properties will differ from Martian dust, are clearly not expected to form localized clouds of small particle size such Figure 2.…”

Section: Cloud Spectral Propertiessupporting

confidence: 56%

New near-IR observations of mesospheric CO₂and H₂O clouds on Mars

et al. 2011

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[1] Carbon dioxide clouds, which are speculated by models on solar and extra-solar planets, have been recently observed near the equator of Mars. The most comprehensive identification of Martian CO 2 ice clouds has been obtained by the near-IR imaging spectrometer OMEGA. CRISM, a similar instrument with a higher spatial resolution, cannot detect these clouds with the same method due to its shorter wavelength range. Here we present a new method to detect CO 2 clouds using near-IR data based on the comparison of H 2 O and CO 2 ice spectral properties. The spatial and seasonal distributions of 54 CRISM observations containing CO 2 clouds are reported, in addition to 17 new OMEGA observations. CRISM CO 2 clouds are characterized by grain size in the 0.5-2 mm range and optical depths lower than 0.3. The distributions of CO 2 clouds inferred from OMEGA and CRISM are consistent with each other and match at first order the distribution of high altitude (>60 km) clouds derived from previous studies. At second order, discrepancies are observed. We report the identification of H 2 O clouds extending up to 80 km altitude, which could explain part of these discrepancies: both CO 2 and H 2 O clouds can exist at high, mesospheric altitudes. CRISM observations of afternoon CO 2 clouds display morphologies resembling terrestrial cirrus, which generalizes a previous result to the whole equatorial clouds season. Finally, we show that morning OMEGA observations have been previously misinterpreted as evidence for cumuliform, and hence potentially convective, CO 2 clouds.

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Section: Cloud Spectral Propertiessupporting

confidence: 56%

New near-IR observations of mesospheric CO₂and H₂O clouds on Mars

et al. 2011

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“…The unequivocal confirmation of clathrate hydrate detection requires spectroscopic means. The spectrometric signatures of clathrates have been studied experimentally for identification in near to mid-infrared wavelengths using space-based observations or in situ probes (Dartois and Schmitt 2009;Dartois et al 2010). For this purpose a dedicated evacuable enclosed cell was built to study the signatures at low temperature, high-vacuum, (P < 10 −7 mbar).…”

Section: High Pressure Simulation Facilitiesmentioning

confidence: 99%

Experimental and Simulation Efforts in the Astrobiological Exploration of Exooceans

Taubner

Olsson-Francis

Vance³

et al. 2020

Space Sci Rev

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The icy satellites of Jupiter and Saturn are perhaps the most promising places in the Solar System regarding habitability. However, the potential habitable environments are hidden underneath km-thick ice shells. The discovery of Enceladus' plume by the Cassini mission has provided vital clues in our understanding of the processes occurring within the interior of exooceans. To interpret these data and to help configure instruments for future missions, controlled laboratory experiments and simulations are needed. This review aims

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“…However, the complex neighbouring or crossing of the carbon dioxide sublimation curve, adsorption on water ice, and clathrate hydrate stability curve in the p-T phase diagram makes the prediction purely on the basis of thermodynamics arguments improbable (e.g. Dartois & Schmitt 2009). In such a case, the spectroscopic expected band doubling or frequency shift of the bands are mandatory for an identification.…”

Section: Spectroscopic Behaviour Of Clathrate Hydratesmentioning

confidence: 99%

Clathrate hydrates : ftir spectroscopy for astrophysical remote detection

Dartois

Bouzit²,

Schmitt³

2012

EAS Publications Series

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Abstract. Inclusion compounds made of a water ice network, clathrate hydrates, are investigated by infrared spectroscopy. Because they can trap important "guest" volatiles species, they may influence the equilibrium, exchange and flux of volatiles in many bodies of the solar system. Their spectroscopic behaviour at low temperature (10-200 K) are shown and the search for their signatures by comparison to solar system objects remote spectra are discussed.

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Carbon dioxide clathrate hydrate FTIR spectrum

Abstract: Context. Clathrate hydrates could provide a sink for highly volatile molecules, thus modifying the release and chemical cycling time scales for gases in icy bodies in the solar system (planets, satellites, comets), as well as for interstellar ice mantles.

Cited by 47 publications

References 39 publications

New near-IR observations of mesospheric CO₂and H₂O clouds on Mars

New near-IR observations of mesospheric CO₂and H₂O clouds on Mars

Experimental and Simulation Efforts in the Astrobiological Exploration of Exooceans

Clathrate hydrates : ftir spectroscopy for astrophysical remote detection

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Carbon dioxide clathrate hydrate FTIR spectrum

Abstract: Context. Clathrate hydrates could provide a sink for highly volatile molecules, thus modifying the release and chemical cycling time scales for gases in icy bodies in the solar system (planets, satellites, comets), as well as for interstellar ice mantles.

Cited by 47 publications

References 39 publications

New near-IR observations of mesospheric CO2and H2O clouds on Mars

New near-IR observations of mesospheric CO2and H2O clouds on Mars

Experimental and Simulation Efforts in the Astrobiological Exploration of Exooceans

Clathrate hydrates : ftir spectroscopy for astrophysical remote detection

Contact Info

Product

Resources

About

New near-IR observations of mesospheric CO₂and H₂O clouds on Mars

New near-IR observations of mesospheric CO₂and H₂O clouds on Mars