| Summary: | This is the model code for simulating the thermo-hydrological regime of boreal permafrost using the CryoGrid community model. It includes modules for excess ground ice, snow dynamics, lateral water flow, and a multi-layer forest canopy. As described in Westermann et al. (2023), the model accurately represents essential ecosystem features and processes. The setup incorporates an implementation for excess ice (Langer et al., 2016; Westermann et al., 2016) and a multilayer canopy module (Stuenzi et al., 2021). This version of CryoGrid operates at a quasi-3D spatial resolution with two laterally connected tiles (Nitzbon et al., 2019; Martin et al., 2021) and a 5-minute time-step. The model input differentiates between forested and bare ground surfaces, with canopy parameters prescribed by the summer leaf area index, stem area index, leaf density function, and tree height following Bonan et al. (2019) and Stuenzi et al. (2021,2022). Snow dynamics are simulated using the Crocus snow scheme (Zweigel et al., 2021), ensuring realistic representation of snow accumulation and melt processes (Vionnet et al., 2012). References Bonan, G. B. (2019). Climate Change and Terrestrial Ecosystem Modeling. In Climate Change and Terrestrial Ecosystem Modeling . Cambridge University Press. https://doi.org/10.1017/9781107339217 Langer, M., Westermann, S., Boike, J., Kirillin, G., Grosse, G., Peng, S., & Krinner, G. (2016). Rapid degradation of permafrost underneath waterbodies in tundra landscapes—Toward a representation of thermokarst in land surface models. Journal of Geophysical Research: Earth Surface , 121 (12), 2446–2470. https://doi.org/10.1002/2016JF003956 Martin, L. C. P., Nitzbon, J., Scheer, J., Aas, K. S., Eiken, T., Langer, M., Filhol, S., Etzelmüller, B., & Westermann, S. (2021). Lateral thermokarst patterns in permafrost peat plateaus in northern Norway. Cryosphere , 15 (7), 3423–3442. https://doi.org/10.5194/tc-15-3423-2021 Nitzbon, J., Langer, M., Westermann, S., Martin, L., Aas, K. S., & Boike, J. (2019). ...
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