Install the IRGASON eddy covariance sensor. The plan is to install this sensor approximately halfway the tower facing northwest (the tower tips southeast for these reasons), so at around 5 m above the ground. The device comes with the EC100 enclosure that should be installed relatively close to the IRGASON. Some relevant specifications are: IRGASON: 20.3 inch length, 12.2 inch height (sounds bigger than it is, see picture on https://www.campbellsci.com/irgason). Weight 2.5 kg. EC100 enclosure: 9.5x14.0x5.5 in. Weight 3.2 kg Because of the additional load, we plan to install guy wires (we already have those in the lab, UTGUY and UTDUK, see campbell scientific website), these were already part of the original plan (2022/2023) but deemed unnecessary so far and so not used until now. To secure the guy wires, we would need to drive stakes into the ground, at around 5.2 m from the tower center (three total). The stakes are similar to those that are already in the ground at the tripods. General maintenance and cleaning of sensors. Hopefully we can do this in a single day, but just in case I've put a range of days in the system (also taking into account rain days, or equipment not ready to go yet). It's also not yet clear who will join due to this uncertainty, so I've put more names in the system than actually required.

Approved