Over the last two decades, Arctic surface air temperatures have increased at a rate twice the global average resulting in unprecedented changes to northern ecosystems (IPCC, 2019). The vulnerability of carbon (C) stocks stored in ice-rich permafrost across the circumpolar region is a key concern due to the potential for positive feedback effects on climate warming (Kuhry et al., 2020). In warmer soils and degrading permafrost, this massive C stock (1,140-1,476 Pg of C in 0-3 m) (Hugelius et al., 2014;Strauss et al., 2017) has the potential to become increasingly available for decomposition and further raise atmospheric concentrations of carbon dioxide (CO 2 ) or methane (CH 4 ). Alternatively, longer growing seasons (Arndt et al., 2019) and greater nutrient availability (López-Blanco et al., 2020) could increase rates of vegetation growth and contribute to a negative feedback effect (i.e., through decreasing atmospheric CO 2 ) (Tagesson et al., 2012). With more than one fifth of frozen soils across high-latitudes experiencing rapid thaw (Turetsky et al., 2019),