TITLE

# Alternative Formulations for Incorporating Lateral Boundary Data into Limited-Area Models

AUTHOR(S)
Tudor, Martina; Termonia, Piet
PUB. DATE
July 2010
SOURCE
Monthly Weather Review;Jul2010, Vol. 138 Issue 7, p2867
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
Limited-area models (LAMs) use higher resolutions and more advanced parameterizations of physical processes than global numerical weather prediction models, but suffer from one additional source of errorâ€”the lateral boundary condition (LBC). The large-scale model passes the information on its fields to the LAM only over the narrow coupling zone at discrete times separated by a coupling interval of several hours. The LBC temporal resolution can be lower than the time necessary for a particular meteorological feature to cross the boundary. A LAM user who depends on LBC data acquired from an independent prior analysis or parent model run can find that usual schemes for temporal interpolation of large-scale data provide LBC data of inadequate quality. The problem of a quickly moving depression that is not recognized by the operationally used gridpoint coupling scheme is examined using a simple one-dimensional model. A spectral method for nesting a LAM in a larger-scale model is implemented and tested. Results for a traditional flow-relaxation scheme combined with temporal interpolation in spectral space are also presented.
ACCESSION #
52844582

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