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Types of measurement
Different types of measurements are monitored regularly, with harmonized protocols and identical sensors on all observatory sites (see table below). Geochemical and geophysical campaigns complete these temporal chronicles.
The data available on the AMMA-CATCH data portal can have two levels of quality :
- "unchecked" : data calibrated
- "validated" : data calibrated then qualified by a measurement expert (PI)
Type of measurement | Measured variables | Typical timestep | Remark |
---|---|---|---|
Meteorology | Air temperature and humidity Atmospheric pressure Wind speed and direction Radiative budget (incoming and outgoing radiation)* |
30 minutes | |
Precipitation | Precipitation | 5 minutes | AMMA-CATCH has a dense network of rain gauges which justifies its distinction from weather stations |
Surface water | Pond water level or river discharge Water temperature* Turbidity* |
10 min to 1 hour, depending on the watershed | Rating curves updated annually |
Ground Water | Water table level pH and water température Conductivity* |
1h to 1 day | |
Soil Moisture | Soil moisture profile (0-1m) Soil temperature profile (0-1m) Soil water succion profile (0-1m) |
30 minutes | |
Surface flux | Eddy covariance (Sensible and latent heat flux, CO2 flux) CO2 Mean concentration Soil heat flux |
30 minutes | |
Vegetation | Biomass LAI FAPAR, FCover* sap flow* |
decadal (herbaceous) every 4 years (trees) hourly (sapflow) |
|
Water and soil chemistry | Major and trace elements Water isotopes |
campaign | Soil profiles C, N, P (0-0.5m) at Dahra |
Geophysical characteristics | Carte et panneaux de résistivité Carte de teneur en eau RMP et porosité cinématique RMP |
campaign | Electrical and Electromagnetic Characterization (TDEM) ; Magnetic Resonance Sounding (MRS) |
* : on a limited number of stations or sites