LEXPLORE PLATFORM

LéXPLORE Letters No. 8

This newsletter was generated on the 06-12-2022.

The figures below are showing data for the period 15-11-2022 to 29-11-2022.

Until today, Thetis sampled 3143 depth profiles on Lake Geneva. In this Newsletter we show 38 profiles, so just 1.21% of the recorded data. The complete data set is available at Datalakes.

Data highlights of this issue

We found a better way to display the amount of rainfall. We now show daily sums of rainfall together with the other atmospheric data. We can nicely see the precipitation brought to the platform with the autumn storms.

These autumn storms also mixed the water column down to over 40 meters at the 18th and 23rd of November, creating positive temperature and chlorophyll anomalies at deeper lake levels. Speaking of anomalies, the upper lake levels are still too warm for the season, reflecting the accumulated energy over the course of a “heat autumn” in Switzerland. Moreover, oxygen concentrations in the water column are very low for this time of the year. This is due to a combination of low chlorophyll concentration (and thus lower oxygen production), decomposing organic material below the surface and rather stratified water columns in the last few weeks.

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

  • Chlorophyll A Anomaly on daily esolution 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 2022: LéXPLORE Letters, 8, https://lexplore.info/wp-content/uploads/2022/12/lexplore-letters-2022-12-06.html