Search Results

You are looking at 1 - 2 of 2 items for :

  • Operational forecasting x
  • Intercomparisons of 4D-Variational Assimilation and the Ensemble Kalman Filter x
  • Review Articles in Monthly Weather Review x
  • All content x
Clear All
Zhiyong Meng and Fuqing Zhang

-model Observing System Simulation Experiments (OSSEs) to more real-data, real-time, quasi-operational applications ( Tong and Xue 2005 ; Barker 2005 ; Zhang et al. 2006 ; Chen and Snyder 2007 ; Meng and Zhang 2007 ; Fujita et al. 2007 , 2008 ; Hacker et al. 2007 ; Meng and Zhang 2008a , b ; Torn and Hakim 2008a , 2009a ; Zhang et al. 2009a ; Aksoy et al. 2009 , 2010 ). The first pseudo-operational regional-scale EnKF system, based on the Weather Research and Forecasting model (WRF), was

Full access
Loïk Berre and Gérald Desroziers

increasing attention recently, in particular in the context of ensemble variational data assimilation for global NWP. b. Error simulation techniques in variational data assimilation The first versions of operational variational schemes often used background error covariances, which were estimated with the so-called NMC method ( Parrish and Derber 1992 ; Rabier et al. 1998 ; Berre 2000 ; Ingleby 2001 ). This method is based on covariances of differences typically between 24- and 48-h forecasts valid at

Full access