Determination of gas exchange on the border between ecosystem and atmosphere: inverse modeling

Technique of data receiving, which is able for determination of the gas flux from the soil by inverse modeling, was suggested. Evaluation of methane flux, using this method, was carried out in a middle taiga oligotrophic wetland. Flux values, determined by suggested technique (1.5–3 mgС–СН$_4$ m$^2$h$^{-1}$), are equal to flux values, determined by static chamber technique in the same wetland. Flux footprint also was determined. It was varied from a few hundred meters (under unstable meteorological conditions) to several thousand meters (under strongly stable meteorological conditions). Suggested technique allows to identify the difference of flux values between two series of measurements, even we takes into account errors of the method and errors, caused by footprint changing during diurnal observations. Dynamic of such factors of methane emission, as water table level and temperature of the soil surface layer can be a cause of this difference.