Objective
Further development of non-local approach to theoretical modelling and practical parameterization of surface fluxes in the calm-weather convection regimes is proposed. In contrast to local approaches, based on traditional treatment of turbulent flows as composed of fully organised mean flow and fully chaotic universal turbulence (down-gradient closures and the Monin-Obukhov similarity theory), an advanced theory will be developed with due regard to vertical transport properties of buoyancy-driven large- scale semi-organised structures.
The basic non-local transport mechanism overlooked in traditional theories is the enhancement of near-surface mixing due to the flow-surface interaction in convergence flow patterns that feed large-scale convective plumes. In recent papers by the participants of the proposed project a non-local model of the weak-wind convection regime has been developed for the convective boundary layers (CBLs) over comparatively smooth surfaces. Non-local effects are shown to be decisive in calm weather, when traditional parameterizations strongly underestimate surface fluxes. To extend the theory to convection regimes over natural rough surfaces and to develop an appropriate flux parameterization scheme, principal revision of the roughness length concept should be undertaken, and an advanced model of the flow-surface interaction in the roughness layer should be developed. To verify new theoretical model/parameterization reliable experimental data are needed, namely, data on the mean and turbulence structure of the CBL and measurements within and immediately above the roughness layer. The proposed project addresses all the above issues.
Expected results from the project are:
(i) improved non-local model of the convective heat/mass transfer over rough surfaces supported by experimental data,
(ii) improved parameterization scheme for the air-sea/air-land fluxes of heat, moisture and other scalars in strong convection regimes over natural land surfaces for use in climate, meso-scale, pollution-dispersion and other environmental models.
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Programme(s)
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Topic(s)
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
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Coordinator
751 20 Uppsala
Sweden
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.