LEXPLORE PLATFORM

LéXPLORE Letters No. 27

This newsletter was generated on the 29-08-2023.

The figures below are showing data for the period 08-08-2023 to 22-08-2023.

Until today, Thetis sampled 3818 depth profiles on Lake Geneva. In this Newsletter we show 19 profiles, so just 0.5% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

While we had to perform some maintenance on the Thetis sensors, we can see that the increasing air temperatures through the middle of August did their job in heating up the top layers of Lake Geneva. Low levels of cloudiness resulted in perfect daily temperature cycles with peaks of above 30 °Celsius.

Interestingly, water layers below 18 meters show rather positive temperature anomalies, even though the lake should be rather stratified in summer. We can only speculate that the windy episodes on August 16th and 17th triggered some mixing of the lake and with that some heat shuffling from the top layers further down.

What is displayed

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:

  • Wave height in decimeter

Authorship and further information

This newsletter is created by EPFL, specifically Martin Wegmann.

For more information about LéXPLORE, contacting us and possibilities to visit the platform: lexplore.info

If you want to know more about the Chlorophyll distribution across Lake Geneva, have a look at the satellite data map by our colleagues at CIPEL.

If you want to know more about the water temperature distribution across Lake Geneva, have a look at the lake reanalysis and forecasts by our colleagues at EAWAG.

If you want to use figures from the LéXPLORE Letters, you can use the following citation:

EPFL, Limnology Center 2023: LéXPLORE Letters, 27, https://lexplore.info/wp-content/uploads/2023/08/lexplore-letters-2023-08-29.html