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)

AMMA-CATCH measurements table

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