G. Evensen was supported by the European Commission through the Environment and Climate Program under Contract ENV4-CT95-0113 (AGORA) and by the Nordic Council of Ministers Contract FS/HFj/X-96001. P. J. van Leeuwen was sponsored by the Space Research Organization Netherlands (SRON) under Grant EO-005.
Bouttier, F., 1994: A dynamical estimation of forecast error covariances in an assimilation system. Mon. Wea. Rev.,122, 2376–2390.
Cohn, S. E., 1993: Dynamics of short term univariate forecast error covariances. Mon. Wea. Rev.,121, 3123–3149.
Daley, R., and T. Mayer, 1986: Estimates of global analysis error from the global weather experiment observational network. Mon. Wea. Rev.,114, 1642–1653.
Epstein, E. S., 1969: Stochastic dynamic prediction. Tellus,21A, 739–759.
Evensen, G., 1992: Using the extended Kalman filter with a multilayer quasi-geostrophic ocean model. J. Geophys. Res.,97 (C11), 17905–17924.
——, 1994a: Inverse methods and data assimilation in nonlinear ocean models. Physica D,77, 108–129.
——, 1994b: Sequential data assimilation with a nonlinear quasi-geostrophic model using Monte Carlo methods to forecast error statistics. J. Geophys. Res.,99 (C5), 10143–10162.
——, 1997: Advanced data assimilation for strongly nonlinear dynamics. Mon. Wea. Rev.,125, 1342–1354.
——, and P. J. van Leeuwen, 1996: Assimilation of Geosat altimeter data for the Agulhas current using the ensemble Kalman filter with a quasi-geostrophic model. Mon. Wea. Rev.,124, 85–96.
Gauthier, P., P. Courtier, and P. Moll, 1993: Assimilation of simulated wind lidar data with a Kalman filter. Mon. Wea. Rev.,121, 1803–1820.
Houtekamer, P. L., and J. Derome, 1995: The RPN Ensemble Prediction System. Seminar Proc. on Predictability, Vol. II, Reading, United Kingdom, European Centre for Medium-Range Weather Forecasts, 121–146.
——, and H. L. Mitchell, 1998: Data assimilation using an ensemble Kalman filter technique. Mon. Wea. Rev.,126, 796–811.
Leith, C. E., 1974: Theoretical skill of Monte Carlo forecasts. Mon. Wea. Rev.,102, 409–418.
Miller, R. N., M. Ghil, and F. Gauthiez, 1994: Advanced data assimilation in strongly nonlinear dynamical systems. J. Atmos. Sci.,51, 1037–1056.
van Leeuwen, P. J., and G. Evensen, 1996: Data assimilation and inverse methods in terms of a probabilistic formulation, Mon. Wea. Rev.,124, 2898–2913.