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Eddy Covariance

The eddy-covariance (EC) technique is the most direct method for measuring turbulent exchanges between ecosystems and the atmosphere. Measurements at a single point, e.g., on a tripod or tower, can represent the ecosystem flux from an upwind area.
EC Station Rottenbuch (TERENO)
EC Fendt
EC Station Fendt (TERENO)

Aim
Measuring the transport/flux of air properties (e.g. temperature) or air constituents (e.g. GHGs) between an ecosystem at the Earth‘s surface and the atmosphere

Advantages
Non-destructive
No disturbance of the exchange conditions
Area-averaging
Quasi-continuous

Assumptions 
Flux is fully turbulent
Zero mean vertical wind
Horizontal homogeneity
Stationarity/steady state conditions
All transporting eddies are captured
Constant flux layer

Instrumentation
Sonic anemometer/thermometer (e.g. Campbell CSAT3, Gill Solent HS/R3), plus infra-red gas analyzer (e.g. LICOR LI7500, LI7200, LI7000)

Data
Latest data from the TERENO prealpine eddy covariance stations can be viewed online

Contact: Dr. Matthias Mauder