With Sébastien and our postdoc Santona Khatun, we successfully tested the new deep-water system — including real-time communication with the instruments and 3D positioning — and obtained some excellent profiles. Everything looks promising for deploying it on several Swiss lakes to better understand nitrous oxide (N₂O) dynamics and greenhouse gas exchange with the atmosphere.
Date : December 2024
Location : Lake Geneva – Switzerland, 46°27′N 6°33′E, altitude 372 m
Team members : Jérôme Chappellaz, Santona Khatun, Sebastien Lavanchy.
Activities : The team tested the new deployment system – on which Sebastien Lavanchy has been working on for a few months prior to this expedition – for the SubOcean laser instruments . We carried out successful deep-water trials with a winch and electric cable for real-time communication, a new CTD probe, sonar, and aquatic GPS. These tests pave the way for upcoming campaigns on Swiss lakes to study nitrous oxide (N₂O) emissions and the processes controlling greenhouse gas exchange with the atmosphere.
