Issues in Downscaling
Downscaling can be considered with respect to 4 basic types of models: one type that is strongly dependent on larger-scale numerical weather prediction lateral boundary conditions, bottom boundary conditions 1, and on initial conditions. A second type has forgotten the initial conditions but is depe...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.423.5025 http://www.isse.ucar.edu/rcw/abstracts/pielke.pdf |
| Summary: | Downscaling can be considered with respect to 4 basic types of models: one type that is strongly dependent on larger-scale numerical weather prediction lateral boundary conditions, bottom boundary conditions 1, and on initial conditions. A second type has forgotten the initial conditions but is dependent on the observed lateral and bottom boundary conditions. A third type is where a large scale model is run which is only forced with surface boundary conditions, and the output used to downscale with a regional model. A fourth type is when a true global climate model (with coupled ocean-atmosphere-continental sea ice-landscape processes, etc) is used to provide lateral boundary conditions to a regional model. This is the IPCC type of downscaling except only a limited set of Earth system forcings (e.g. the radiative effect of CO2, solar insolation) is included in the IPCC approach. To summarize with examples (IC=initial conditions; LBC= lateral boundary conditions; and BBC=bottom boundary conditions; with the recognition that BBC includes bottom interfacial fluxes): |
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