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Inverse three-dimensional variational data assimilation for an advection-diffusion problem: Impact of diffusion and hybrid application

Title
Inverse three-dimensional variational data assimilation for an advection-diffusion problem: Impact of diffusion and hybrid application
Authors
Park, SKKalnay, E
Ewha Authors
박선기
SCOPUS Author ID
박선기scopus
Issue Date
2004
Journal Title
GEOPHYSICAL RESEARCH LETTERS
ISSN
0094-8276JCR Link
Citation
vol. 31, no. 4
Publisher
AMER GEOPHYSICAL UNION
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
[1] In this study, the performance of inverse three-dimensional variational assimilation (I3D-Var) is investigated in terms of dissipation process for an advection-diffusion problem. The performance of I3D-Var becomes poorer with larger diffusion coefficients. However, even for strong dissipation, the cost function during early iterations in the I3D-Var decreases still much faster than it does in the standard four-dimensional variational assimilation (4D-Var). Based on this observation a hybrid approach that combines the I3D-Var and the 4D-Var is suggested to accelerate the performance of 4D-Var. Application of this hybrid method demonstrates that the I3D-Var can serve as a preconditioner for carrying minimization in the full 4D-Var framework. Using the initial conditions obtained through the I3D-Var, the 4D-Var showed much faster convergence in minimizing the cost function.
DOI
10.1029/2003GL018830
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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