LEXPLORE PLATFORM

LéXPLORE Letters No. 12

This newsletter was generated on the 31-01-2023.

The figures below are showing data for the period 10-01-2023 to 24-01-2023.

Until today, Thetis sampled 3306 depth profiles on Lake Geneva. In this Newsletter we show 26 profiles, so just 0.79% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

Thetis continues to collect data in a season that was never sampled by Thetis before. This makes the sampled data extra valuable for future research (and future newsletters), but does not allow us to show you the daily anomalies for this issue.

Since Thetis was under maintenance for a large part of the period shown, we only sampled a few data points since the last issue released. But what we can see is a very stratified lake with minimal biological activity, slowly getting colder. Air temperatures dropped below freezing with high wind speeds but low wave heights, pointing towards cold northerly winds, also known locally as La Bise .

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, 12, https://lexplore.info/wp-content/uploads/2023/01/lexplore-letters-2023-01-31.html