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D-CEP - Double-Canyon Effect Parametrization

What does the scheme do?

D-CEP is an urban parametrization scheme for use in regional climate models. It determines the interaction of the atmosphere with urban surfaces including the exchange of momentum and energy fluxes. Urban radiative processes and properties such as radiation trapping and a low albedo are modelled in detail. Currently, D-CEP is fully on-line coupled with the regional climate model COSMO-CLM, which allows a detailed study of the effects of a city on the air temperature within the city and also of its surroundings. Thus, D-CEP is able to determine the strength e.g. of the well-known urban heat island effect, and can be used to assess urban climate, energy use and adaptation options.

Who maintains it?

Sebastian Schubert and Susanne Grossman-Clarke maintain and further develop D-CEP.

What are the next development steps?

The presentation of precipitation in D-CEP is currently improved and the implementation of a more detailed approach to energy consumption is planned. Furthermore, an off-line version of D-CEP will be developed to reduce the computational costs, which are mainly due to the regional climate model.

In what way is the model different from other models in the community?

D-CEP has been developed with large building heights and building height differences in a city district in mind. Here, the representation of radiative processes are more detailed than in other urban canopy schemes. Furthermore, due to its multi-layer formulation D-CEP describes not only the horizontal but also the vertical distribution of urban effects on the atmosphere.

Key publications

S. Schubert, S. Grossman-Clarke; Evaluation of the coupled COSMO-CLM/DCEP model with observations from BUBBLE; Q.J.R. Meteorol. Soc., 2014, doi:10.1002/qj.2311

S. Schubert, S. Grossman-Clarke; The Influence of Green Areas and Roof Albedos on Air Temperatures during Extreme Heat Events in Berlin, Germany; Meteorologische Zeitschrift, 2013, doi:10.1127/0941-2948/2013/0393

S. Schubert, S. Grossman-Clarke, A. Martilli; A Double-Canyon Radiation Scheme for Multi-Layer Urban Canopy Models; Boundary Layer Meteorology, 2012, doi:10.1007/s10546-012-9728-3

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