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Volume 16, issue 13
Atmos. Chem. Phys., 16, 8375-8387, 2016
https://doi.org/10.5194/acp-16-8375-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 8375-8387, 2016
https://doi.org/10.5194/acp-16-8375-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Jul 2016

Research article | 12 Jul 2016

The incorporation of an organic soil layer in the Noah-MP land surface model and its evaluation over a boreal aspen forest

Liang Chen1,2, Yanping Li1, Fei Chen3, Alan Barr4, Michael Barlage3, and Bingcheng Wan3 Liang Chen et al.
  • 1Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada
  • 2Key Laboratory of Regional Climate Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 3National Center for Atmospheric Research, Boulder, Colorado, USA
  • 4Environment Canada, National Hydrology Research Center, Saskatoon, SK, Canada

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

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This work is the first time that Noah-MP is used to investigate the impact of parameterizing organic soil at a boreal forest site. Including an organic soil parameterization significantly improved performance of the model in surface energy and hydrology simulations due to the lower thermal conductivity and greater porosity of the organic soil. It substantially modified the partition between direct soil evaporation and vegetation transpiration in the simulation.
This work is the first time that Noah-MP is used to investigate the impact of parameterizing...
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