Titan's 5 μm Spectral Window: Carbon Monoxide and the Albedo of the Surface

Details Titan's 5 μm Spectral Window: Carbon Monoxide and the Albedo of the Surface Titan's 5 μm Spectral Window: Carbon Monoxide and the Albedo of the Surface

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996icar..124..625n&link_type=abstract

Icarus, Volume 124, Issue 2, pp. 625-631.

Physics

27

Scientific paper

We have measured the spectrum of Titan near 5 μm and have found it to be dominated by absorption from the carbon monoxide 1-0 vibration-rotation band. The position of the band edge allows us to constrain the abundance of CO in the atmosphere and/or the location of the reflecting layer in the atmosphere. In the most likely case, 5 μm radiation is reflected from the surface and the mole fraction of CO in the atmosphere is qCO = 10^+10_-5 ppm, significantly lower than previous estimates for tropospheric CO. The albedo of the reflecting layer is approximately 0.07^+0.02_-0.01 in the 5 μm continuum outside the CO band. The 5 μm albedo is consistent with a surface of mixed ice and silicates similar to the icy Galilean satellites. Organic solids formed in simulated Titan conditions can also produce similar albedos at 5 mum.

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