Observations of C 2H 6 and C 2H 2 in the stratosphere of Saturn

Pedro V. Sada, Gordon L. Bjoraker, Donald E. Jennings, Paul N. Romani, George H. McCabe

Research output: Contribution to journalArticle

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Abstract

We have performed high-resolution spectral observations at mid-infrared wavelengths of C 2H 6 (12.16 μm), and C 2H 2 (13.45 μm) on Saturn. These emission features probe the stratosphere of the planet and provide information on the hydrocarbon photochemical processes taking place in that region of the atmosphere. The observations were performed using our cryogenic echelle spectrometer Celeste, in conjunction with the McMath-Pierce 1.5-m solar telescope in November and December 1994. We used Voyager IRIS CH 4 observations (7.67 μm) to derive a temperature profile on the saturnian atmosphere for the P⩽˜1.6mbar region of the stratosphere. This profile was then used in conjunction with height-dependent volume mixing ratios of each hydrocarbon to determine global abundances for ethane and acetylene. Our ground-based measurements indicate abundances of 6.7-2.3+3.3×10 for C 2H 6 (1.0 mbar pressure level), and 3.4-1.1+1.5×10 for C 2H 2 (1.6 mbar pressure level). We also derived new mixing ratios from the Voyager mid-latitude IRIS observations; 8.6±0.9×10 for C 2H 6 (0.1-3.0 mbar pressure level), and 1.6±0.2×10 for C 2H 2 (2.0 mbar pressure level).
Original languageEnglish
Pages (from-to)499-507
JournalIcarus
Volume173
Issue number2
DOIs
Publication statusPublished - 1 Feb 2005
Externally publishedYes

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Saturn
stratosphere
mixing ratio
mixing ratios
hydrocarbon
atmosphere
hydrocarbons
ethane
acetylene
spectral resolution
atmospheres
conjunction
spectrometer
planet
probe
planets
telescopes
spectrometers
methylidyne
probes

Cite this

Sada, P. V., Bjoraker, G. L., Jennings, D. E., Romani, P. N., & McCabe, G. H. (2005). Observations of C 2H 6 and C 2H 2 in the stratosphere of Saturn. Icarus, 173(2), 499-507. https://doi.org/10.1016/j.icarus.2004.08.006
Sada, Pedro V. ; Bjoraker, Gordon L. ; Jennings, Donald E. ; Romani, Paul N. ; McCabe, George H. / Observations of C 2H 6 and C 2H 2 in the stratosphere of Saturn. In: Icarus. 2005 ; Vol. 173, No. 2. pp. 499-507.
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Sada, PV, Bjoraker, GL, Jennings, DE, Romani, PN & McCabe, GH 2005, 'Observations of C 2H 6 and C 2H 2 in the stratosphere of Saturn', Icarus, vol. 173, no. 2, pp. 499-507. https://doi.org/10.1016/j.icarus.2004.08.006

Observations of C 2H 6 and C 2H 2 in the stratosphere of Saturn. / Sada, Pedro V.; Bjoraker, Gordon L.; Jennings, Donald E.; Romani, Paul N.; McCabe, George H.

In: Icarus, Vol. 173, No. 2, 01.02.2005, p. 499-507.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observations of C 2H 6 and C 2H 2 in the stratosphere of Saturn

AU - Sada, Pedro V.

AU - Bjoraker, Gordon L.

AU - Jennings, Donald E.

AU - Romani, Paul N.

AU - McCabe, George H.

PY - 2005/2/1

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N2 - We have performed high-resolution spectral observations at mid-infrared wavelengths of C 2H 6 (12.16 μm), and C 2H 2 (13.45 μm) on Saturn. These emission features probe the stratosphere of the planet and provide information on the hydrocarbon photochemical processes taking place in that region of the atmosphere. The observations were performed using our cryogenic echelle spectrometer Celeste, in conjunction with the McMath-Pierce 1.5-m solar telescope in November and December 1994. We used Voyager IRIS CH 4 observations (7.67 μm) to derive a temperature profile on the saturnian atmosphere for the P⩽˜1.6mbar region of the stratosphere. This profile was then used in conjunction with height-dependent volume mixing ratios of each hydrocarbon to determine global abundances for ethane and acetylene. Our ground-based measurements indicate abundances of 6.7-2.3+3.3×10 for C 2H 6 (1.0 mbar pressure level), and 3.4-1.1+1.5×10 for C 2H 2 (1.6 mbar pressure level). We also derived new mixing ratios from the Voyager mid-latitude IRIS observations; 8.6±0.9×10 for C 2H 6 (0.1-3.0 mbar pressure level), and 1.6±0.2×10 for C 2H 2 (2.0 mbar pressure level).

AB - We have performed high-resolution spectral observations at mid-infrared wavelengths of C 2H 6 (12.16 μm), and C 2H 2 (13.45 μm) on Saturn. These emission features probe the stratosphere of the planet and provide information on the hydrocarbon photochemical processes taking place in that region of the atmosphere. The observations were performed using our cryogenic echelle spectrometer Celeste, in conjunction with the McMath-Pierce 1.5-m solar telescope in November and December 1994. We used Voyager IRIS CH 4 observations (7.67 μm) to derive a temperature profile on the saturnian atmosphere for the P⩽˜1.6mbar region of the stratosphere. This profile was then used in conjunction with height-dependent volume mixing ratios of each hydrocarbon to determine global abundances for ethane and acetylene. Our ground-based measurements indicate abundances of 6.7-2.3+3.3×10 for C 2H 6 (1.0 mbar pressure level), and 3.4-1.1+1.5×10 for C 2H 2 (1.6 mbar pressure level). We also derived new mixing ratios from the Voyager mid-latitude IRIS observations; 8.6±0.9×10 for C 2H 6 (0.1-3.0 mbar pressure level), and 1.6±0.2×10 for C 2H 2 (2.0 mbar pressure level).

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SP - 499

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JO - Icarus

JF - Icarus

SN - 0019-1035

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ER -

Sada PV, Bjoraker GL, Jennings DE, Romani PN, McCabe GH. Observations of C 2H 6 and C 2H 2 in the stratosphere of Saturn. Icarus. 2005 Feb 1;173(2):499-507. https://doi.org/10.1016/j.icarus.2004.08.006