Spectroscopic blending and biased abundance retrievals in the 12µm band of ethane in Titan

Details Spectroscopic blending and biased abundance retrievals in the 12µm band of ethane in Titan Spectroscopic blending and biased abundance retrievals in the 12µm band of ethane in Titan

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ttt..work...71h&link_type=abstract

Through Time; A Workshop On Titan's Past, Present and Future, NASA Goddard Space Flight Center, April 6th - 8th, 2010. Edited b

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Scientific paper

Comparison between hydrocarbon abundance retrievals from the Cassini Huygens mission and ground-based spectroscopy at very high resolution provides a unique opportunity to calibrate the accuracy of spacecraft investigations and to enhance the value of ground-based investigations in increasing our understanding of chemical and dynamical processes in Titan's atmosphere. Retrieved stratospheric ethane (C2H6) mole fraction from Infrared Heterodyne Spectroscopy resolved emission line profiles (λ/Δλ~ 10^6 and greater) differs from retrievals from CIRS spectra (λ/Δλ ~ 2000). The differing retrievals may partly result from blended spectral features of other molecular constituents not resolved by CIRS, including acetylene (C2H2), ethylene (C2H4), allene (C3H4) and propane (C3H8), which can be discriminated using IR heterodyne fully resolved line profiles. These molecular contributions can be discerned through high spectral-resolution ground-based studies, complementing the spectral and spatial coverage and spatial resolution of space-borne spectrometers of moderate spectral-resolution. We will discuss the discrepancy in abundance retrievals as a function of resolving power and temperature due to constituents unaccounted for and incomplete molecular line atlases.

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