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• W4366997836 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Arctic terrestrial greenhouse gas (GHG) fluxes of carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) play an important role in the global GHG budget. However, these GHG fluxes are rarely studied simultaneously, and our understanding of the conditions controlling them across spatial gradients is limited. Here, we explore the magnitudes and drivers of GHG fluxes across fine-scale terrestrial gradients during the peak growing season (July) in sub-Arctic Finland. We measured chamber-derived GHG fluxes and soil temperature, soil moisture, soil organic carbon and nitrogen stocks, soil pH, soil carbon-to-nitrogen (C/N) ratio, soil dissolved organic carbon content, vascular plant biomass, and vegetation type from 101 plots scattered across a heterogeneous tundra landscape (5 km²). We used these field data together with high-resolution remote sensing data to develop machine learning models to predict (i.e., upscale) daytime GHG fluxes across the landscape at 2-m resolution. Our results show that this region was on average a daytime net GHG sink during the growing season. Although our results suggest that this sink was driven by CO₂ uptake, it also revealed small but widespread CH₄ uptake in upland vegetation types, shifting this region to an average net CH₄sink at the landscape scale during growing season, despite the presence of high-emitting wetlands. Average N₂O fluxes were negligible. CO₂ fluxes were controlled primarily by annual average soil temperature and biomass (both increase net sink) and vegetation type, CH₄ fluxes by soil moisture (increases net emissions) and vegetation type, and N₂O fluxes by soil C/N (lower C/N increases net source). These results demonstrate the potential of high spatial resolution modelling of GHG fluxes in the Arctic. They also reveal the dominant role of CO₂ fluxes across the tundra landscape, but suggest that CH₄ uptake might play a significant role in the regional GHG budget." @default.
• W4366997836 created "2023-04-27" @default.
• W4366997836 creator A5029361445 @default.
• W4366997836 date "2023-04-25" @default.
• W4366997836 modified "2023-10-18" @default.
• W4366997836 title "Comment on bg-2023-61" @default.
• W4366997836 doi "https://doi.org/10.5194/bg-2023-61-rc1" @default.
• W4366997836 hasPublicationYear "2023" @default.
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