Mismatch of N release from the permafrost and vegetative uptake opens pathways of increasing nitrous oxide emissions in the high Arctic ...

• Main Authors: Lacroix, Fabrice, Zaehle, Sönke, Caldararu, Silvia, Schaller, Jörg, Stimmler, Peter, Holl, David, Kutzbach, Lars, Göckede, Mathias
• Format: Text
• Language: unknown
• Published: Wiley 2022
• Subjects: 530 Physics; 550 Earth sciences & geology; permafrost
• Online Access: https://dx.doi.org/10.48350/192228; https://boris.unibe.ch/192228/

iogeochemical cycling in permafrost-affected ecosystems remains associated with large uncertainties, which could impact the Earth's greenhouse gas budget and future climate policies. In particular, increased nutrient availability following permafrost thaw could perturb the greenhouse gas exchange in these systems, an effect largely unexplored until now. Here, we enhance the terrestrial ecosystem model QUINCY (QUantifying Interactions between terrestrial Nutrient CYcles and the climate system), which simulates fully coupled carbon (C), nitrogen (N) and phosphorus (P) cycles in vegetation and soil, with processes relevant in high latitudes (e.g., soil freezing and snow dynamics). In combination with site-level and satellite-based observations, we use the model to investigate impacts of increased nutrient availability from permafrost thawing in comparison to other climate-induced effects and CO2 fertilization over 1960 to 2018 across the high Arctic. Our simulations show that enhanced availability of nutrients ...