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Title: First results of ISO-SWS observations of Saturn: Detection of CO2, CH3C2H, C4H2 and tropospheric H2O
Authors: deGraauw, T ×
Feuchtgruber, H
Bezard, B
Drossart, P
Encrenaz, T
Beintema, DA
Griffin, M
Heras, A
Kessler, M
Leech, K
Lellouch, E
Morris, P
Roelfsema, PR
RoosSerote, M
Salama, A
Vandenbussche, Bart
Valentijn, EA
Davis, GR
Naylor, DA #
Issue Date: May-1997
Publisher: Springer verlag
Series Title: Astronomy and astrophysics vol:321 issue:2 pages:L13-L16
Abstract: The spectrum of Saturn has been recorded between 4.5 and 16.0 mu m with the grating mode of the Short-Wavelength Spectrometer (SWS) of ISO. The resolving power is 1500. The main results of this observation are (1) the detection of CO2 CH3C2H and C4H2 in the stratosphere and (2) the detection of H2O in the troposphere. In the 4.5-5.5 mu m range, information is retrieved on the tropospheric composition (NH3, PH3, AsH3, GeH4, CH3D and H2O) down to pressure levels of several bars. Above 7 mu m, the Saturn spectrum probes the upper troposphere and the lower stratosphere, at pressure levels ranging from 0.5 bar to 0.4 mbar. The CH4 emission band at 7.7 mu m and the H-2-He continuum longward of 11 mu m are used to retrieve the thermal profile, which is then used to derive the vertical distributions of minor species: NH3, PH3, CH3D in the troposphere, and C2H2 and C2H6 in the stratosphere. Estimates of the CO2, CH3C2H and C4H2 mean mixing ratios (above the 10-mbar level) are 3 10(-10), 6 10(-10) and 9 10(-11) respectively. The retrieved disk-averaged thermal profile is found to be colder in the stratosphere than the Voyager 1 ingress radio-occultation profile by about 7 K at P = 0.5 mbar, and slightly warmer in the troposphere (about 5 K at 400 mbar and 3 K at 150 mb).
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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