La fédération
Intranet
Aquatic Environments
In situ dissolved gases measurements : CH4, δ13CH4 and C2H6
The SubOcean probe for in situ high resolution measurement of dissolved gases (CH4, δ13CH4 and C2H6) is at its third prototyping. It is now 19 cm diameter, 90 cm long 50 kg of weight and it is designed for deployments down to 3000 m of depth. It was successfully deployed : in the Mediterranean Sea (2014), In the Arctic (2015) at Lake Kivu in Rwanda (2019), at Lake Aiguebelette (2019), in the Black Sea (2019), again in the Black sea in 2021 and in Japan and in Lake Geneva in 2022.
In the frame of the EquipEx Terra Forma a lighter version is under developpment together with the in situ sensor for measuring dissolved CO2δ13CO2.
Since July 2021, this development is moving toward a commercialization through the partnership with A2 Photonic Sensors in Grenoble.
People involved and principal collaborators :
Livio Ruffin (IFREMER), water column.
Jean-Daniel Paris (LSCE), sea/water interface.
Marc Delmotte (LSCE), atmospheric measurements.
Julien Nemery (IGE), Fluxes of GHG.
Tonya delSontro (University of Waterloo, Canada), data interpretation.
Frederick Jacob (EDF, France), Degassing of hydroelectric power dams.
Benedicte Ferré (UoT, Norway), methane seeps in the Arctic.
Knut Ola Dølven (UoT, Norway), Data modeling.
Hideyoshi Yoshioka (AIST, Japan), methane seeps.
Didier Jezequel (IPGP, INRAE), Applications in lakes.
Umutoni Augusta (LKMP, Rwanda), Applications in lakes.
A2 Photonic Sensors , Technology transfer.
In situ water isotope measurement : δD and δ18O of H2O
The ANR project "SWIS" (Subsea Water Isotope Sensors : A novel tool for continuous and in-situ analysis, February 2019 – July 2022) aims the development of an in situ tool for continuous measurement of water isotopes in the water. This development would allow to increase the available data for accessing to the origins of water masses, important for studying the fresh water cycle at high latitude or for understanding the process at work responsible for the melting of the ice shelves in Antarctica.
The instrument was constructed by the engineer C. Blouzon, and it is now under laboratory validation by the PhD student Axel Wohleber. Current precisions are 0.2‰ for both δD and δ18O, with one measurement every 4 to 8 min. In the frame of theHorizon Europe project OCEAN:ICE “Ocean-Cryosphere Exchanges in Antarctica : Impacts on Climate and the Earth System”) the instrument will be deployed underneath of the Fimbulisen Ice Shelf during the austral summer 2023/24.
People involved and main collaborations :
Axel Wohleber (IGE), PhD student on the study of the fresh water cycle using this new tool.
Nicolas Jourdain (IGE), Data Modeling
Jean-Baptiste Sallée (LOCEAN), Interpretation of the data
Claire Waelbroeck (LOCEAN), Interpretation of the data
Gilles Reverdin (LOCEAN), Interpretation of the data
Tore Hattermann (Norwegian Polar institute), Borehole applications
Gael Durand (IGE), Data Modeling
