LEXPLORE PLATFORM

LéXPLORE Letters No. 11

This newsletter was generated on the 17-01-2023.

The figures below are showing data for the period 27-12-2022 to 10-01-2023.

Until today, Thetis sampled 3253 depth profiles on Lake Geneva. In this Newsletter we show 38 profiles, so just 1.17% 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.

What we can infer from the depth profiles, is that deep mixing occurred around January 1st, accompanied by an episode of windy and wavy weather from the 28th of December to the 2nd of January. On that note, the data from the automated weather station also nicely highlights the high air temperatures for New Years Eve. Record air temperatures for that day were the case for many locations in Central Europe. An event that was covered extensively by the media at that time.

Very high waves mark the end of this rather mild episode, with wave heights up to 83 cm. These waves were among the highest ever recorded on our platform. Unfortunately, Thetis was under maintenance at that time, but luckily other instruments were still running. As always, you can check out the rest of the data at https://www.datalakes-eawag.ch/.

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, 11, https://lexplore.info/wp-content/uploads/2023/01/lexplore-letters-2023-01-17.html