LEXPLORE PLATFORM

LéXPLORE Letters No. 18

This newsletter was generated on the 25-04-2023.

The figures below are showing data for the period 04-04-2023 to 18-04-2023.

Until today, Thetis sampled 3533 depth profiles on Lake Geneva. In this Newsletter we show 57 profiles, so just 1.61% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

After a slight mixing of the water column around the 12th of April, where colder water from the depth was shuffled towards the surface, conditions rapidly changed.

The fresh precipitation and runoff from the 15th of April together with the warmer and sunnier atmospheric conditions of the next day, enabled a substantial Chlorophyll A increase in the upper lake layers after a period of lower-than-usual Chlorophyll A amount below our platform. That in turn increased the amount of dissolved oxygen in the lake water.

As air temperatures are currently rather low to average for this time of the year, we see the same environmental conditions expressed in the lake water temperatures, with strong day-to-day changes due to transient weather systems.

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, 18, https://lexplore.info/wp-content/uploads/2023/04/lexplore-letters-2023-04-25.html