LEXPLORE PLATFORM

LéXPLORE Letters No. 29

This newsletter was generated on the 26-09-2023.

The figures below are showing data for the period 05-09-2023 to 19-09-2023.

Until today, Thetis sampled 3876 depth profiles on Lake Geneva. In this Newsletter we show 26 profiles, so just 0.67% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

Unfortunately, the Thetis Chlorophyll A and backscattering sensors need heavy maintenance right now. That is why these variables are missing from todays issue. We added the salinity information for now, in order to show you some interesting content.

Besides the extreme rainfall event at September 13th, the most striking feature of this issue is the very positive water anomalies close to the lake surface. The very warm weather at the beginning of September left its mark on the water temperatures, leading to temperature anomalies of up to 2.5 Kelvin compared to previous years.

Moreover, after the heavy rainfall event, we can nicely see salinity levels dropping in the upper lake layers.

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 %

  • Salinity mg/L

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, 29, https://lexplore.info/wp-content/uploads/2023/09/lexplore-letters-2023-09-26.html