All individual flux measurements used to produce best-fit curves are available in the "ITEX circumarctic CO2 flux survey: CO2 flux measurements" data file, CO2_flux_measurements.xls. All times are given as local times.
| Variable |
Description |
| YEAR |
Year of measurement |
| DATE |
Date of data collection |
| SITE |
Abisko, Toolik, or Svalbard |
| GROUP |
STEPPS, Latnjajaure, or Paddus (Abisko, Sweden); Imnavait or Toolik Lake (Alaska, USA); airport, babbling brook, Bjorndalen, Callaghan, fragile site, happy valley, ocean view, river bed, Svalsat, or salt marsh (Svalbard, Norway) |
| PLOT |
Individual plot identifier |
| TREAT |
Controlled or fertilized annually (with N and P) |
| PHASE |
Measurement series (round of measurements within each year) |
| CURVE ID |
Light curve identifier |
| TIME |
Time light curve taken where avg indicates more than one curve in a day (HH:MM) |
| NDVI |
NDVI of flux plot (0.01 dimensionless) |
| Pmax |
Light saturated photosynthesis (0.1 µmol C*m-2ground*s-1) |
| K |
Half saturation constant (µmol PAR*m-2ground*s-1) |
| Re |
Ecosystem respiration (0.1 µmol C*m-2ground*s-1) |
| E0 |
Ecosystem light use efficiency (0.001 µmol C*µmol-1PAR) |
| LCP |
Ecosystem light compensation point (0.1 µmol PAR*m-2ground*s-1) |
| AIRTEMP |
Average air temperature (0.1 °C) |
| max PAR |
Maximum ambient PAR at which a flux measurement was taken for the sunlight curve (µmol PAR*m-2ground*s-1) |
