Troposphere-stratosphere interactions
Our work on troposphere-stratosphere interactions follows observational, theoretical and modelling approaches. Our observational component consists in developing innovative instruments, coordinating and participating in field campaigns. Observational data are used to validate theories and improve representation of dynamical processes in atmospheric models
Strateole 2
Strateole-2 is a French-US
project to study climate processes in the vicinity of the
tropopause tropical layer. The project originality pertains
to the use of CNES superpressure balloons, capable of
drifting for several months between 18 and 20 km altitude. Two
field campaigns occurred during 2019-2020 and 2021-2022 periods.
The above figure shows the balloons launched during the 2019-2020
period (left) and balloon measurements of gravity wave activity as
function of the distance to convection (right). It shows the
larger variability of gravity wave activity closer to the
convection and suggest preferred generation of gravity waves at
specific stage of the convection.
Gravity-wave parameterizations in climate models
Observational datasets are useful to develop and validate parameterizations of gravity waves in climate models. The team is involved in different international programmes: QBOi (Quasi Biennal Oscillation initiative) which aims at better understanding QBO evolution under climate change and DataWave promoting the development of new gravity wave parameterization using machine learning techniques.
Stratospheric plumes generated by volcanoes eruptions and huge wild fires
