منابع مشابه
Data assimilation and its applications.
In data assimilation, one prepares the grid data as the best possible estimate of the true initial state of a considered system by merging various measurements irregularly distributed in space and time, with a prior knowledge of the state given by a numerical model. Because it may improve forecasting or modeling and increase physical understanding of considered systems, data assimilation now pl...
متن کاملFrom the Academy Data assimilation and its applications
In data assimilation, one prepares the grid data as the best possible estimate of the true initial state of a considered system by merging various measurements irregularly distributed in space and time, with a prior knowledge of the state given by a numerical model. Because it may improve forecasting or modeling and increase physical understanding of considered systems, data assimilation now pl...
متن کاملChapter Variational Data Assimilation : Theory and Applications 1
Variational data assimilation is performed using either a T40 18 layer version of the National Meteorological Center spectral model or a limited-area shallow-water equations model, with operationally analyzed fields as well as simulated datasets. Issues of incomplete observations, control of gravitational oscillations, and inclusion of “on-off” physical processes are addressed in the framework ...
متن کاملSensitivity analysis in variational data assimilation and applications
Mathematical aspects of sensitivity analysis in unconstrained optimization are reviewed and the sensitivity equations of a variational data assimilation system (VDAS) to observations, background estimate, and to the specification of the associated error-variances are derived from the first order optimality condition. The error-variance sensitivity is introduced as a feasible approach to provide...
متن کاملAn Extended Generalized Lindley Distribution and Its Applications to Lifetime Data
In this paper, a four parameters extension of the generalized Lindley distribution is introduced. The new distribution includes the power Lindley, Lindley, generalized (Stacy) gamma, gamma, Weibull, Rayleigh, exponential and half-normal distribution. Several statistical properties of the distribution are explored. Then, a bivariate version of the proposed distribution is derived. Using a simula...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2000
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.97.21.11143