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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 9
Geosci. Model Dev., 9, 3111-3122, 2016
https://doi.org/10.5194/gmd-9-3111-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Geosci. Model Dev., 9, 3111-3122, 2016
https://doi.org/10.5194/gmd-9-3111-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Development and technical paper 07 Sep 2016

Development and technical paper | 07 Sep 2016

Improved representations of coupled soil–canopy processes in the CABLE land surface model (Subversion revision 3432)

Vanessa Haverd1, Matthias Cuntz2, Lars P. Nieradzik1, and Ian N. Harman1 Vanessa Haverd et al.
  • 1CSIRO Oceans and Atmosphere, P.O. Box 3023, Canberra ACT 2601, Australia
  • 2Department Computational Hydrosystems, UFZ – Helmholtz Centre for Environmental Research, Permoserstr. 15, 04318 Leipzig, Germany

Abstract. CABLE is a global land surface model, which has been used extensively in offline and coupled simulations. While CABLE performs well in comparison with other land surface models, results are impacted by decoupling of transpiration and photosynthesis fluxes under drying soil conditions, often leading to implausibly high water use efficiencies. Here, we present a solution to this problem, ensuring that modelled transpiration is always consistent with modelled photosynthesis, while introducing a parsimonious single-parameter drought response function which is coupled to root water uptake. We further improve CABLE's simulation of coupled soil–canopy processes by introducing an alternative hydrology model with a physically accurate representation of coupled energy and water fluxes at the soil–air interface, including a more realistic formulation of transfer under atmospherically stable conditions within the canopy and in the presence of leaf litter. The effects of these model developments are assessed using data from 18 stations from the global eddy covariance FLUXNET database, selected to span a large climatic range. Marked improvements are demonstrated, with root mean squared errors for monthly latent heat fluxes and water use efficiencies being reduced by 40%. Results highlight the important roles of deep soil moisture in mediating drought response and litter in dampening soil evaporation.

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CABLE is a global land surface model, which has been used extensively in offline and coupled simulations. We improve CABLE’s simulation of evaporation using a new scheme for drought response and a physically accurate representation of coupled energy and water fluxes in the soil. Marked improvements in predictions of evaporation are demonstrated globally. Results highlight the important roles of deep soil moisture in mediating drought response and litter in dampening soil evaporation.
CABLE is a global land surface model, which has been used extensively in offline and coupled...
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