Microscale drivers of summer CO2 fluxes in the Svalbard High Arctic tundra ...

• Main Authors: Magnani, Marta, Baneschi, Ilaria, Giamberini, Mariasilvia, Raco, Brunella, Provenzale, Antonello
• Format: Article in Journal/Newspaper
• Language: English
• Published: Zenodo 2022
• Subjects: Carbon fluxes; Arctic; tundra; Gross primary productivity; Ecosystem respiration; flux chamber; Bayelva; Ny-Ålesund; Svalbard; Climate change; Ny Ålesund; Spitzbergen; Tundra
• Online Access: https://dx.doi.org/10.5281/zenodo.7580031; https://zenodo.org/record/7580031

High-Arctic ecosystems are strongly affected by climate change, and it is still unclear whether they will become a carbon source or sink in the next few decades. In turn, such knowledge gaps on the drivers and the processes controlling CO2 fluxes and storage make future projections of the Arctic carbon budget a challenging goal. During summer 2019, we extensively measured CO2 fluxes at the soil–vegetation–atmosphere interface, together with basic meteoclimatic variables and ecological characteristics in the Bayelva river basin near Ny Ålesund, Spitzbergen, Svalbard (NO). By means of multi-regression models, we identified the main small-scale drivers of CO2 emission (Ecosystem Respiration, ER), and uptake (Gross Primary Production, GPP) in this tundra biome, showing that (i) at point scale, the temporal variability of fluxes is controlled by the classical drivers, i.e. air temperature and solar irradiance respectively for ER and GPP, (ii) at site scale, the heterogeneity of fractional vegetation cover, soil ...