Abstract: Covariance models used in the data assimilation step of operational forecasting generally assume isotropy of height field correlations on constant pressure levels. Because of the evidence that this assumption is a significant ...

Abstract: The Gandin optimal analysis scheme leaves open the problem of determining the covariance matrix on which it depends. The choice of an autocorrelation function for geopotential, from which geostrophically consistent ...

Abstract: Space?time filtering has a long and often confusing history in the geosciences. It is called by different names in different areas of geoscience, where numerous applications have been developed. The variety of notations ...

Abstract: The possibility of improving point estimates through anisotropic interpolation is investigated. Experiments employing multivariate optimal interpolation compare rms errors for estimates based on an anisotropic geopotential ...

Abstract: A matrix combination of vector-valued information on meteorological parameters is proposed for the incorporation of data from irregularly spaced observing systems, as well as data from forecasts and climatology. This is a ...

Abstract: In estimating grid-point states with a multivariate, objective analysis procedure, knowledge of covariances of meteorological parameters observed at several locations is required. It is possible to improve accuracy in ...

Abstract: No abstract available.

Abstract: Properties of the optimal combination scheme for several vector estimates are developed for correlated estimates having common ensemble mean. Classic optimality properties of a linear combination of estimates from separate ...

Abstract: Objective analyses using the so-called method of optimum interpolation incorporates statistical information on the variable(s) by means of the covariance or correlation functions. The concern in this contribution is with ...

Abstract: A detailed study of hemispheric forecast-error (f.e.) statistics for the operational Canadian large-scale forecast model was made in preparation for reparameterization of the correlation function used in the data assimilation ...