View article

Arctic and subarctic regions, which contain more than 33% of the world's soil organic carbon, are warming up to four times faster than the global average and have poorly understood and modeled biophysical, biogeochemical, and ecohydrological processes. To better understand and constrain land models, especially regarding permafrost thaw and subsequent feedbacks to the earth system, The Warming Permafrost Model Intercomparison Project (WrPMIP) has modeled experimental permafrost warming sites across the Pan-Arctic. Though observational data in high-latitude ecosystems are limited, especially during winter, The WrPMIP has identified key observed responses that state-of-the-art carbon cycle models should accurately capture. We suggest that some of the most important processes to properly simulate are those related to soil freeze-thaw dynamics because of their importance in the net carbon …