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Control of lateral boundary conditions in four-dimensional variational data assimilation for a limited area model
SMHI, Research Department, Meteorology.ORCID iD: 0000-0001-8376-2729
2012 (English)In: Tellus. Series A, Dynamic meteorology and oceanography, ISSN 0280-6495, E-ISSN 1600-0870, Vol. 64, 17518Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 64, 17518
Keyword [en]
data assimilation, lateral boundary conditions
National Category
Meteorology and Atmospheric Sciences
Research subject
Meteorology
Identifiers
URN: urn:nbn:se:smhi:diva-486DOI: 10.3402/tellusa.v64i0.17518ISI: 000302383500001OAI: oai:DiVA.org:smhi-486DiVA: diva2:805241
Available from: 2015-04-15 Created: 2015-04-14 Last updated: 2016-11-21Bibliographically approved

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