This newsletter was generated on the 17-09-2023.
The figures below are showing data for the period 22-08-2023 to 05-09-2023.
Until today, Thetis sampled 3862 depth profiles on Lake Geneva. In this Newsletter we show 30 profiles, so just 0.78% of the recorded data. The complete data set is available at Datalakes.
While Switzerland experienced a very hot summer overall, we saw a drastic decrease of air temperature and overall change of weather patterns at the end of August, which impacted Lake Geneva quite a bit. We can see a reduction of surface water temperatures together with air temperatures, leading to negative temperature anomalies, especially close to the surface around August 28th and 29th.
The associated rainfall also brought with it a high amount of runoff particles, visible in the 700 nm backscattering plot. The continuously windy period together with small but steady waves on August 31st mixed up particles, heat and oxygen in the lake and made the water column more homogeneous.
At the beginning of September, the fair weather resumed and the lake warmed up again.
Data from the Thetis profiler:
Water Temperature in °Celsius
Water Temperature Anomaly on daily resolution with respect to to the available daily climatology from Thetis so far in Kelvin
Dissolved Oxygen mg/L
Oxygen Saturation in %
Chlorophyll A in μg/L
Chlorophyll A Anomaly on daily resolution with respect to to the available daily climatology from Thetis so far in μg/L
Backscattering of light 700 nm in 1.e-2 m-1, representing zooplankton or larger particles in the water
Data from the automatic weather station:
Air Temperature in °Celsius
Wind Speed in m/s
Precipitation in mm
Data from the wave buoy:
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