Eddy Covariance
On-board logging of data sets
Greenhouse gas analyzer systems from LI-COR Biosciences facilitate the collection of eddy covariance data sets by logging CH4, CO2, and H2O density data, along with wind speed data (U, V, W, and Ts) to a removable USB data storage device. Data can also be transferred via the Ethernet to an external data storage device or computer network.
Eddy Covariance Resources:
by G. Burba and
D. Anderson
Available for Free Download
Sonic Integration
Connectivity & Datalogging
EddyPro Software
Eddy Covariance Training
For more information on the theory behind the eddy covariance method, view the Ecosystem Gas Exchange application page:
Eddy Covariance
Simplifying eddy covariance data collection
The figure above shows methane, carbon dioxide, and latent energy fluxes measured with the eddy covariance technique over the Florida Everglades. These data are a subset of a 6 week data set collected during the winter of 2008-09, at 3.5 m above the canopy, using an LI-7500 Open Path CO2/H2O Analyzer and an LI-7700 Open Path CH4 Analyzer. They show a negative flux of CO2, but positive CH4 and LE fluxes for the measurement period, so we know that this ecosystem was a sink of carbon dioxide and a source of methane and water vapor.
Both the LI-7700 Open Path CH4 Analyzer and the LI-7550 Analyzer Interface Unit provide four general ±5 V inputs for analog data from any fast sonic anemometer, (including Campbell® Scientific1, Gill Instruments2, Metek3, Kaijo4, RM Young5, or others) ) The LI-7700 also provides three additional type E thermocouple inputs for recording additional temperature data if desired.
Analog inputs are used with either the 7550-101 Auxiliary Sensor Interface or custom analog input cables, which are available from LI-COR.
1 Campbell Scientific, Inc., Logan UT
2 Gill Instruments Ltd., Lymington Hampshire, UK
3 Metek GmbH, Germany
4 Kaijo Sonic Corporation, Japan
5 RM Young, Traverse City, MI