Eddy Covariance Measurements

Following SpecNet objectives, Biospec aims to improve our understanding of controls on the biosphere-atmosphere exchange of carbon and water vapor fluxes by combining flux towers and scale-appropriate remote sensing measurements. This challenge requires multi-scale analyses of spectral signals and optical-flux relationships, as well as comparative analyses of optical-flux relationships across ecosystems. For that purpose, the project will benefit from 2 flux-tower sites operated by CEAM. These sites are performing eddy covariance fluxes and ancillary measurements following the standards and procedures defined by the national or world-wide flux station networks in which they are included (CARBORED-ES, CARBOEUROPE-IP, FLUXNET).

Table with the measured variables:

• Start date refers to the currently (in June 2013) active measurement set up (instrument model, location, etc….). It does not mean the starting date for the continuous measurement of the variable. Most of the main meteorological variables (radiation, air temperature, relative humidity, atmospheric pressure, etc.) are available since may 2003, when the Las Majadas flux station was established.
• Measurement period is the time resolution at which the data are logged and stored into database. Sampling frequency is 10 Hz for EC instruments (Sonic 3D anemometer and IRGA) and 0.1 Hz for all others measurements.
• Continuous measurements are performed at different depths (profile) at 4 locations within tower footprint.