CIRA/CSU Four-Dimensional Variational Data Assimilation System

Zupanski, M., D. Zupanski, T. Vukicevic, K. Eis, T. Vonder Haar

Mon. Wea. Rev., 133, 829-843

Read more at http://journals.ametsoc.org/doi/abs/10.1175/MWR2891.1