Monitoring the surface-layer turbulence at the Calern observatory with a sonic anemometer

We analyse atmospheric turbulence data provided by a sonic anemometer at the Calern observatory (South of France). The instrument was located on a 4m high tower above the ground, and monitored meteorological parameters (temperature, wind speed) and optical turbulence (C-T(3), C-n(2)) inside the surface layer. We collected about 200 000 data points during one year campaign (from Dec. 2019 to Nov. 2020), and present statistics of the monitoring. We found a median C-n(2) of 9.10(-15)m(-2/3), with a strong dependence with the time of the day. Results show a good agreement with data from other instruments of the Calern Atmospheric Turbulence Station, CATS.