ICOS-INWIRE report 4.3
A heavy-duty, robust autonomous eddy covariance system (HAEC) has been designed and constructed in line with the ICOS-INWIRE work package (WP) 4 objectives. The main design criteria are: a resistance to extreme weather especially cold extremes, the efficient use of limited energy supply, the intelligent use of wireless technology, the compliance to ICOS specifications and where feasible WMO standards, and the use of readily available technologies where possible. The system can be divided in four parts: an eddy covariance element containing its own data logger and power supply, meteorology and radiation elements, a wireless networked ground sensors element and an electricity and data handling element. The wireless networked sensors had to be designed and constructed from scratch. Initial prototypes have been tested in the field. While not yet faultless they have shown great stability and consistency. Tests in Spain have been concluded, tests in Sweden are underway and at the end of the winter the final testing phase in Finland will start.