Abstract
Abstract In this paper, we present the first measurements of the vertical distribution of cyanogen ( ) in Titan’s lower atmosphere at different latitudes and seasons, using Cassini’s Composite Infrared Spectrometer far-infrared data. We also study the vertical distribution of three other minor species detected in our data: methylacetylene ( ), diacetylene ( ), and , in order to compare them to , but also to get an overview of their seasonal and meridional variations in Titan’s lower stratosphere from 85 km to 225 km. We measured an average volume mixing ratio of of at 125 km at the equator, but poles exhibit a strong enrichment in (up to a factor 100 compared to the equator), greater than what was measured for or . Measuring profiles provides constraints on the processes controlling its distribution, such as bombardment by Galactic Cosmic Rays which seem to have a smaller influence on than predicted by photochemical models.
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