Summary: | International audience We have monitored the seasonal evolution near Titan's poles and equator from 2012 until the last flyby of Titan in 2017. The 2017 data we have acquired and processed here are very important as they also show that the Southern pole is finally showing a significant decrease in abundance. Indeed, in the Titan south pole stratosphere some molecules had preserved their enhancement until end of 2016, before suffering a sudden and large drop in abundance in 2017. This is indicative of a non-symmetrical response to the seasons in Titan's stratosphere that can set constraints on photochemical and GCM models.
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