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Open AccessArticle

A Multivariate Balanced Initial Ensemble Generation Approach for an Atmospheric General Circulation Model

International Center for Climate and Environment Science, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
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Water 2021, 13(2), 122; https://doi.org/10.3390/w13020122
Received: 30 October 2020 / Revised: 3 December 2020 / Accepted: 29 December 2020 / Published: 7 January 2021
Based on the multivariate empirical orthogonal function (MEOF) method, a multivariate balanced initial ensemble generation method was applied to the ensemble data assimilation scheme. The initial ensembles were generated with a reasonable consideration of the physical relationships between different model variables. The spatial distribution derived from the MEOF analysis is combined with the 3-D random perturbation to generate a balanced initial perturbation field. The Local Ensemble Transform Kalman Filter (LETKF) data assimilation scheme was established for an atmospheric general circulation model. Ensemble data assimilation experiments using different initial ensemble generation methods, spatially random and MEOF-based balanced, are performed using realistic atmospheric observations. It is shown that the ensembles integrated from the balanced initial ensembles maintain a much more reasonable spread and a more reliable horizontal correlation compared with the historical model results than those from the randomly perturbed initial ensembles. The model predictions were also improved by adopting the MEOF-based balanced initial ensembles. View Full-Text
Keywords: MEOF; initial ensemble; ensemble spread; LETKF; data assimilation MEOF; initial ensemble; ensemble spread; LETKF; data assimilation
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MDPI and ACS Style

Du, J.; Zheng, F.; Zhang, H.; Zhu, J. A Multivariate Balanced Initial Ensemble Generation Approach for an Atmospheric General Circulation Model. Water 2021, 13, 122. https://doi.org/10.3390/w13020122

AMA Style

Du J, Zheng F, Zhang H, Zhu J. A Multivariate Balanced Initial Ensemble Generation Approach for an Atmospheric General Circulation Model. Water. 2021; 13(2):122. https://doi.org/10.3390/w13020122

Chicago/Turabian Style

Du, Juan; Zheng, Fei; Zhang, He; Zhu, Jiang. 2021. "A Multivariate Balanced Initial Ensemble Generation Approach for an Atmospheric General Circulation Model" Water 13, no. 2: 122. https://doi.org/10.3390/w13020122

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