Coustenis explains, "As with Earth, conditions on Titan change with its seasons. We can see differences in atmospheric temperatures, chemical composition and circulation patterns, especially at the poles. For example, hydrocarbon lakes form around the north polar region during winter due to colder temperatures and condensation. Also, a haze layer surrounding Titan at the northern pole is significantly reduced during the equinox because of the atmospheric circulation patterns. This is all very surprising because we didn’t expect to find any such rapid changes, especially in the deeper layers of the atmosphere."
The main cause of these cycles is solar radiation. This is the dominant energy source for Titan’s atmosphere, breaking up the nitrogen and methane present to create more complex molecules, such as ethane, and acting as the driving force for chemical changes. Titan is inclined at around 27 degrees, similar to the Earth, meaning that the cause of seasons – sunlight reaching different areas with varying intensity due to the tilt – is the same for both worlds. Coustenis says, "It’s amazing to think that the Sun still dominates over other energy sources even as far out as Titan, over 1.5 billion kilometres from us."
To draw these conclusions data was analysed from several different missions, including Voyager 1 (1980), the Infrared Space Observatory (1997), and Cassini (2004 onwards), complemented by ground-based observations. Each season on Titan spans around 7.5 years, while it takes 29.5 years for Saturn to orbit the Sun, so data has now been gathered for an entire Titan year, encapsulating all seasons.
Coustenis explains why it is important to investigate this distant moon: "Titan is the best opportunity we have to study conditions very similar to our own planet in terms of climate, meteorology and astrobiology and at the same time a unique world on its own, a paradise for exploring new geological, atmospheric and internal processes."
The European Planetary Science Congress EPSC is a major European meeting about Solar System exploration that attracts scientists from around the World. The 2012 programme included more than 50 sessions and workshops, at Madrid, Spain, from Sunday 23 September to Friday 28 September. It was organised by Europlanet Research Infrastructure €6 million programme co-funded by the European Union and European Commission.
Observatoire de Paris
Science contact
– Athena Coustenis
CNRS senior scientist
LESIA1
+33 (0)1 45 07 77 20
Press contact
– Anita Heward
Europlanet Press Officer
+44 7756 034243
1 The Laboratoire d’Études Spatiales et d’Instrumentation en Astrophysique LESIA is an Observatoire de Paris science department. It is associated to CNRS, Université Pierre et Marie Curie, Université Paris Diderot.
Last update on 21 December 2021