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공공누리This item is licensed Korea Open Government License

dc.contributor.author
신설은
dc.contributor.author
Eugenia Kalnay
dc.contributor.author
Shu-Chin Yang
dc.contributor.author
강지순
dc.date.accessioned
2019-08-28T07:42:14Z
dc.date.available
2019-08-28T07:42:14Z
dc.date.issued
2018-11-13
dc.identifier.issn
0035-9009
dc.identifier.uri
https://repository.kisti.re.kr/handle/10580/14732
dc.description.abstract
We test an ensemble data assimilation system using the 4-D Local Ensemble Transform Kalman Filter (4D-LEKTF) for a global Numerical Weather Prediction (NWP) model with unstructured grids on the cubed sphere. It is challenging to selectively represent structures of dynamically growing errors in background states under system uncertainties such as sampling and model errors. We compute Ensemble Singular Vectors (ESVs) in an attempt to capture fast growing errors on the subspace spanned by ensemble perturbations, and use them as additive inflation to enlarge the covariance in the area where errors are flow-dependently growing. The performance of the 4D-LETKF system with ESVs is evaluated in real data assimilation, as well as Observing System Simulation Experiments (OSSEs). We find that leading ESVs help to capture fast growing errors effectively, especially when model errors are present, and that the use of ESVs as additive inflation significantly improves the performance of the 4D-LETKF.
dc.language
eng
dc.relation.ispartofseries
Quarterly Journal of the Royal Meteorological Society
dc.title
Ensemble singular vectors as additive inflation in the Local Transform Kalman Filter (LETKF) framework with a global NWP model
dc.subject.keyword
Ensemble Singular Vectors
dc.subject.keyword
Ensemble Data assimilation
dc.subject.keyword
Local Ensemble Transform Kalman Filter
dc.subject.keyword
Numerical Weather Prediction
dc.subject.keyword
Atmospheric Global Model
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7. KISTI 연구성과 > 학술지 발표논문
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