文章基本信息

标题：Four-dimensional variational data assimilation for a limited area model
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作者：Nils Gustafsson ; Xiang-Yu Huang ; Xiaohua Yang 等
期刊名称：Tellus A: Dynamic Meteorology and Oceanography
电子版ISSN：1600-0870
出版年度：2012
卷号：64
期号：1
页码：1-29
DOI：10.3402/tellusa.v64i0.14985
摘要：A 4-dimensional variational data assimilation (4D-Var) scheme for the HIgh Resolution Limited Area Model (HIRLAM) forecasting system is described in this article. The innovative approaches to the multi-incremental formulation, the weak digital filter constraint and the semi-Lagrangian time integration are highlighted with some details. The implicit dynamical structure functions are discussed using single observation experiments, and the sensitivity to various parameters of the 4D-Var formulation is illustrated. To assess the meteorological impact of HIRLAM 4D-Var, data assimilation experiments for five periods of 1 month each were performed, using HIRLAM 3D-Var as a reference. It is shown that the HIRLAM 4D-Var consistently out-performs the HIRLAM 3D-Var, in particular for cases with strong mesoscale storm developments. The computational performance of the HIRLAM 4D-Var is also discussed. The review process was handled by Subject Editor Abdel Hannachi.
关键词：data assimilation ; analysis ; numerical weather prediction