Permafrost science remains limited in data. Observations at isolated spaces and times are insufficient to evaluate the long term climatic and environmental responses over large regions. Permafrost models may be used to establish links between the geographical scales from local to large regional, continental, and hemispheric scales. This poster aims to show some examples for measuring C/N quantities and CO2/CH4 fluxes and to offer comparison of their contribution in C-cycle in different areas of Lena Delta River (2-core comparison and a global one on 12 core samples from the KoPf Expedition in 2018)