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

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