LEXPLORE PLATFORM

LéXPLORE Letters No. 22

This newsletter was generated on the 20-06-2023.

The figures below are showing data for the period 30-05-2023 to 13-06-2023.

Until today, Thetis sampled 3714 depth profiles on Lake Geneva. In this Newsletter we show 49 profiles, so just 1.32% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

After a rather cold spring, June started warm with air temperatures above 25 °Celsius. As a result, the lake is also slowly heating up. And after a weak mixing event on June 4th, the water below the platform reached 20 °Celsius surface water temperature around June 11th. Such temperatures can be considered very high for the season, as we can see water temperature anomalies of up to +3 Kelvin for that date.

With warmer waters and more available sunlight, oxygen production by phytoplankton increases as well. We also see a very nice signal in the 700 nm backscattering data around and after June 3rd, which is mostly a representation of the runoff particles in the water, induced by the strong precipitation event the same day.

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, 22, https://lexplore.info/wp-content/uploads/2023/06/lexplore-letters-2023-06-20.html