LEXPLORE PLATFORM

LéXPLORE Letters No. 25

This newsletter was generated on the 02-08-2023.

The figures below are showing data for the period 12-07-2023 to 26-07-2023.

Until today, Thetis sampled 3778 depth profiles on Lake Geneva. In this Newsletter we show 15 profiles, so just 0.4% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

Thetis is finally back from a major maintenance time out! As fresh data is streaming in, we can have a look at the week between the 20th and 26th of July. The most noteworthy event is the windy episode around July 25th, which shuffled the very warm surface water to deeper lake layers, resulting in a negative temperature anomaly at the surface, and a rather positive temperature anomaly below 20 meters depth.

The extremely warm lake surface temperatures are most likely due to the exceptionally warm June air temperatures together with very high air temperatures between the 15th and 23rd of July.

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, 25, https://lexplore.info/wp-content/uploads/2023/08/lexplore-letters-2023-08-02.html