Estimates of the terrestrial gross primary production for the south of Western Siberia in 2014-2021 according to OCO-2 and OCO-3 data

Terrestrial gross primary production (GPP) is the quantitative equivalent of the total amount of carbon assimilated by vegetation through photosynthesis. The GPP is crucial element for understanding land-atmosphere carbon exchange. In recent years, solar-induced chlorophyll fluorescence (SIF) observed by satellite radiometers has been considered as a new approach to advance research on monitoring of GPP from space. In this paper we presents quantitative estimates of the terrestrial gross primary production for the region of the south of Western Siberia (50º-55 º N, 75º -90º E) obtained using “sun-induced chlorophyll fluorescence” data products from orbital carbon observatories OCO-2 and OCO-3. The analysis of OCO-2 data was carried out for the period 2014-2021, the results of OCO-3 were added to processing from 2019. It was established that GPP reaches a maximum in the summer months and is ~10 − 12 gC m-2day-1.