LEXPLORE PLATFORM

LéXPLORE Letters No. 42

This newsletter was generated on the 26-03-2024.

The figures below are showing data for the period 05-03-2024 to 19-03-2024.

Until today, Thetis sampled 4181 depth profiles on Lake Geneva. In this Newsletter we show 29 profiles, so just 0.69% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

Going into the first half of March 2024, we continue to see very high daily mean water temperature anomalies, with peaks up to +1.7 Kelvin. Not only is the magnitude so high, the whole water column shows positive temperature anomalies, from the Lake’s surface down to 50 meters depth. That is astonishing!

The reasons for that are obviously the very high air temperatures for this time of the year, we recorded up to 14° Celsius peak air temperatures.

Interestingly, the Chlorophyll A anomalies show negative values towards the peak water temperatures appearance. The rain events on March 16th and 18th might have been impacted phytoplancton cohesion and Chlorophyll production.

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 2024: LéXPLORE Letters, 42, https://lexplore.info/wp-content/uploads/2024/03/lexplore-letters-2024-03-26.html