Reduced non-Gaussianity by 30 s rapid update in convective-scale numerical weather prediction

Ruiz Juan; Lien Guo-Yuan; Kondo KeiichiOtsuka ShigenoriMiyoshi Takemasa

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Reduced non-Gaussianity by 30 s rapid update in convective-scale numerical weather prediction

机译：Reduced non-Gaussianity by 30 s rapid update in convective-scale numerical weather prediction

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Non-Gaussian forecast error is a challenge for ensemble-based data assimilation (DA), particularly for more nonlinear convective dynamics. In this study, we investigate the degree of the non-Gaussianity of forecast error distributions at 1 km resolution using a 1000-member ensemble Kalman filter, and how it is affected by the DA update frequency and observation number. Regional numerical weather prediction experiments are performed with the SCALE (Scalable Computing for Advanced Library and Environment) model and the LETKF (local ensemble transform Kalman filter) assimilating phased array radar observations every 30 s. The results show that non-Gaussianity develops rapidly within convective clouds and is sensitive to the DA frequency and the number of assimilated observations. The non-Gaussianity is reduced by up to 40 % when the assimilation window is shortened from 5 min to 30 s, particularly for vertical velocity and radar reflectivity.

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《nonlinear processes in geophysics》 |2021年第4期|615-626|共12页
作者
Ruiz Juan; Lien Guo-Yuan; Kondo KeiichiOtsuka ShigenoriMiyoshi Takemasa;
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RIKEN Center for Computational Science;

Center for Oceanic and Atmospheric Research (CIMA-UBA/CONICET);

Atmospheric and Oceanographic Science Department, FCEyN, University of Buenos AiresFrench-Argentinean Institute for the Study of Climate and its Impacts (UMI-IFAECI/CNRS-CONICET-UBA)Research and Development Center, Central Weather BureauDepartment of Observation and Data Assimilation Research, Meteorological Research InstituteRIKEN Cluster for Pioneering ResearchRIKEN Interdisciplinary Theoretical and Mathematical Sciences ProgramAtmospheric and Oceanic Science Department, University of Maryland, College ParkJapan Agency for Marine-Earth Science and Technology;

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Reduced non-Gaussianity by 30 s rapid update in convective-scale numerical weather prediction

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