Shallow soil moisture – ground thaw interactions and controls – Part 2: Influences of water and energy fluxes

摘要: Abstract. The companion paper (Guan et al., 2010) demonstrated variable interactions and correlations between shallow soil moisture ground thaw in filled areas along a wetness spectrum subarctic Canadian Precambrian Shield landscape. From wetter to drier, these included wetland, peatland valley. Herein, water energy fluxes were examined for same study sites discern the key controlling processes on found patterns. Results showed presence of surface was control frost table among sites. At wetland sites, accumulated depressions flow paths maintained longer duration than at hummock tops. These wet often locations deepest depth due transfer latent heat accompanying lateral runoff. Although had large inundation extent, modified Peclet numbers indicated relative influence external internal hydrological each site different. Continuous inflow from an upstream lake into caused advective conductive thermal energies be equal importance thaw. absence continuous valley led dominance over results suggest that number could very useful parameter differentiate landscape components modeling heterogeneity. calculated fluxes, provide quantitative explanations moisture-ground patterns by linking them with hillslope storage capacity.