CO2 Modelling from Eddy Covariance Measurements for Biebrza Wetlands.

The main goal of this study was the determination of carbon flux model for the area of the Biebrza Wetlands, to evaluate their potential as carbon sinks, based on meteorological, soil and vegetation parameters. Based on ground data and satellite data (images from the Sentinel -1, -2, -3 and MODIS) acquired in 2017–2019, a statistical model was used that combines the carbon dioxide stream, latent heat and soil moisture. The flux of carbon dioxide and latent heat were recorded using the eddy covariance tower, which allows for very high sensitivity measurements at a frequency of 20 Hz. Soil moisture was measured at various points in the Biebrza National Park at a depth of 5 cm with a time resolution of 15 minutes. Later, the field parameters were replaced with their satellite equivalents (e.g. soil moisture - [1]), which made it possible to obtain carbon dioxide flux values for any point within the park. The assessment of carbon fluxes is performed at 1-km spatial scale. Carbon measurements done by the chamber method were used to verify the model. All data were extracted using a R programming language script. Further analyses were carried out in R and Statistica program, the satellite image processing was performed using a ERDAS and program R.