LEXPLORE PLATFORM

LéXPLORE Letters No. 19

This newsletter was generated on the 09-05-2023.

The figures below are showing data for the period 18-04-2023 to 02-05-2023.

Until today, Thetis sampled 3588 depth profiles on Lake Geneva. In this Newsletter we show 52 profiles, so just 1.45% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

After a relatively cold April in Switzerland, Lake Geneva is also rather cold (up to -2 Kelvin) compared to previous observations recorded by Thetis for this time of the year. A windy episode around the 23rd of April with wave heights up to 70 cm shuffled the water column a fair bit, bringing up oxygen depleted water masses from deeper lake levels. At the end of April, air temperatures increased and with that surface water temperatures got warmer as well.

Unfortunately, the Chlorophyll A and Backscattering measurements are corrupted after April 24th and the LéXPLORE team is already on the case to fix the issue.

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 Speend 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, 19, https://lexplore.info/wp-content/uploads/2023/05/lexplore-letters-2023-05-09.html