LEXPLORE PLATFORM

LéXPLORE Letters No. 6

This newsletter was generated on the 08-11-2022.

The figures below are showing data for the period 18-10-2022 to 01-11-2022.

Until today, Thetis sampled 3062 depth profiles on Lake Geneva. In this Newsletter we show 46 profiles, so just 1.5% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

Water and air around our platform continue to be exceptionally warm for this time of the year. We can see temperature anomalies for the upper lake levels of more than 1 Kelvin consistently for nearly two weeks, including peaks of over 2 Kelvin. That also leaves the water column below 20 meters to be very stable for this season.

A short windy and wavy episode around the 24th of October mixed the top 30 meter of the water column. This event triggered some mild chlorophyll increase in deeper layers due to newly available nutrients, concurrent with elevated dissolved oxygen levels. Nevertheless, oxygen saturation much lower then during the summer months due to the decreased primary production in the lake ecosystem.

What is displayed

Data from the Thetis profiler:

  • Water Temperature in °Celsius

  • Water Temperature Anomaly on daily esolution 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

  • Backscattering of light 700 nm in 1.e-2 m-1, representing zooplankton or larger particles in the water

  • Salinity in mg/L

Data from the automatic weather station:

  • Air Temperature in °Celsius

  • Wind Speend in m/s

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 2022: LéXPLORE Letters, 6, https://lexplore.info/wp-content/uploads/2022/11/lexplore-letters-2022-11-08.html