Control of lateral boundary conditions in four-dimensional variational data assimilation for a limited area model

Autor: Nils Gustafsson
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 64, Iss 0, Pp 1-14 (2012)
Druh dokumentu: article
ISSN: 0280-6495
1600-0870
DOI: 10.3402/tellusa.v64i0.17518
Popis: The limited area model forecasting problem is a lateral boundary condition (LBC) problem in addition to the initial condition problem. The data assimilation has traditionally been considered as a process for estimation of the initial condition only, while for the limited area data assimilation this estimation may be extended to include also the LBCs, at least during the data assimilation time window when observations are available. A procedure for such a control of the LBCs has been included in the four-dimensional variational data assimilation (4D-Var) scheme for the HIgh Resolution Limited Area Model (HIRLAM) forecasting system. A description of this procedure is provided together with results from idealised as well as real data experiments. The results indicate that control of LBCs may be important with small forecast domains and in particular for weather disturbances moving quickly into and through the forecast domain.
Databáze: Directory of Open Access Journals
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