What is it about?
LBGM method lets the perturbation RMSE at grid points within a certain range around a point to determine the scaling factor at that point, which incorporates local information into the rescaled perturbation. At the same time, the scope of local area can be adjusted by assigning different impact radius.
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Why is it important?
In general, the dominant approach both in China and overseas is to use orthogonality to tackle the dispersion or independence in short-term or convective-scale ensemble forecasting like the ensemble transformation Kalman filter (ETKF). But all these methods have some disadvantages.
Perspectives
This LBGM method based on traditional BGM is conceptually novel. As it requires no additional computation resources, this method has great application potential in convection-allowing ensemble forecasts.
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Read the Original
This page is a summary of: Algorithm based on local breeding of growing modes for convection-allowing ensemble forecasting, Science in China Series D Earth Sciences, February 2018, Springer Science + Business Media,
DOI: 10.1007/s11430-017-9167-5.
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