The incorporation of an organic soil layer in the Noah-MP Land Surface Model and its evaluation over a Boreal Aspen Forest

摘要: Abstract. A thick top layer of organic matter is a dominant feature in boreal forests and can impact land–atmosphere interactions. In this study, the multi-parameterization version Noah land surface model (Noah-MP) was used to investigate incorporating forest-floor soil on simulated energy water cycle components at BERMS Old Aspen site (OAS) field station central Saskatchewan, Canada. Compared simulation without an parameterization (CTL), Noah-MP with (OGN) improved Noah-MP-simulated temperature profiles moisture 40–100 cm, especially phase amplitude (Seasonal cycle) below 10 cm. OGN also enhanced sensible latent heat fluxes spring, wet years, which mostly related timing spring thaw warming. Simulated top-layer better than that CTL. The effects including are not uniform throughout depth more prominent summer. For drought substantially modified partitioning between direct evaporation vegetation transpiration. OGN-simulated similar CTL except for season when produced less evaporation, closer observations. Including subsurface runoff resulted much higher freezing periods years.