Degerö Stormyr is one of the most intensively studied mire ecosystems in the Northern Hemisphere. Measurements of carbon dioxide, water and energy exchanges between the mire and the atmosphere have been conducted since 2001 using the eddy covariance (EC) technique. The EC system is based on a Licor 6262 gas analyser together with a Gill R3 sonic wind sensor located at 2 meter above the mire surface. With the sampling frequency of 20 Hz fluxes (CO2, H2O, heat and momentum), concentrations and wind characteristics are automatically acquired and processed by EC-system software (Ecoflux, In Situ) and averaged for 30-minute periods. Complementary abiotic variables, such as meteorological and mire environmental conditions, are measured at the site.
Thermistors (ToJo skogsteknik) are used for soil temperatures, Rotronic probe in a ventilated radiation shield for air temperature and relative humidity. Licor types of sensors are used to measure PPFD and global radiation while net radiation is measured with a Kipp & Zonen (NR Lite) sensor. Snow depth is measured with a sonic distometer (Campbell type SR50) and air pressure is measured with a Vaisala barometer. Summer precipitation (rain) is recorded by a tipping bucket (Campbell ARG100). All abiotic sensors are connected to Campbell CR10-loggers for recording 30-minute values. The configuration of the measurement set up and most of the instruments have remained the same since 2001 and are still in operation as of 2016.