Coupled Global-Regional Data Assimilation Using Joint States

2012 ◽  
Author(s):  
Istvan Szunyogh
Keyword(s):  
Data Assimilation ◽  
Regional Data

The BMRC Regional Data Assimilation System

1990 ◽  
Vol 118 (6) ◽  
pp. 1217-1237 ◽  
Author(s):  
G. A. Mills ◽  
R. S. Seaman
Keyword(s):  
Data Assimilation ◽  
Regional Data ◽  
Data Assimilation System ◽  
Assimilation System

The Canadian Regional Data Assimilation System: Operational and Research Applications

1994 ◽  
Vol 122 (6) ◽  
pp. 1306-1325 ◽  
Author(s):  
Clément Chouinard ◽  
Jocelyn Mailhot ◽  
Herschel L. Mitchell ◽  
Andrew Staniforth ◽  
Richard Hogue
Keyword(s):  
Data Assimilation ◽  
Regional Data ◽  
Data Assimilation System ◽  
Assimilation System

scholarly journals The Canadian Regional Data Assimilation and Forecasting System

2010 ◽  
Vol 25 (6) ◽  
pp. 1645-1669 ◽  
Author(s):  
Luc Fillion ◽  
Monique Tanguay ◽  
Ervig Lapalme ◽  
Bertrand Denis ◽  
Michel Desgagne ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Spherical Harmonics ◽  
Local Analysis ◽  
Limited Area ◽  
Regional Data ◽  
Background Error ◽  
Regional System ◽  
Forecasting System ◽  
Spectral Representations ◽  
Multiple Domains

Abstract This paper describes the recent changes to the regional data assimilation and forecasting system at the Canadian Meteorological Center. A major aspect is the replacement of the currently operational global variable resolution forecasting approach by a limited-area nested approach. In addition, the variational analysis code has been upgraded to allow limited-area three- and four-dimensional variational data assimilation (3D- and 4DVAR) analysis approaches. As a first implementation step, the constraints were to impose similar background error correlation modeling assumptions, equal computer resources, and the use of the same assimilated data. Both bi-Fourier and spherical-harmonics spectral representations of background error correlations were extensively tested for the large horizontal domain considered for the Canadian regional system. Under such conditions, it is shown that the new regional data assimilation and forecasting system performs as well as the current operational system and it produces slightly better 24-h accumulated precipitation scores as judged from an ensemble of winter and summer cases. Because of the large horizontal extent of the regional domain considered, a spherical-harmonics spectral representation of background error correlations was shown to perform better than the bi-Fourier representation, considering all evaluation scores examined in this study. The latter is more suitable for smaller domains and will be kept for the upcoming use in the kilometric-scale local analysis domains in order to support the Canadian Meteorological Center’s (CMC’s) operations using multiple domains over Canada. The CMC’s new regional system [i.e., a regional limited-area 3DVAR data assimilation system coupled to a limited-area model (REG-LAM3D)] is now undergoing its final evaluations before operational transfer. Important model and data assimilation upgrades are currently under development to fully exploit this new system and are briefly presented.

Regional Data Assimilation with the NCMRWF Unified Model (NCUM): Impact of Doppler Weather Radar Radial Wind

2019 ◽  
Vol 176 (10) ◽  
pp. 4575-4597 ◽  
Author(s):  
Devajyoti Dutta ◽  
Ashish Routray ◽  
D. Preveen Kumar ◽  
John P. George
Keyword(s):  
Data Assimilation ◽  
Weather Radar ◽  
Unified Model ◽  
Doppler Weather Radar ◽  
Regional Data
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