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Steven J. Greybush, Eugenia Kalnay, Takemasa Miyoshi, Kayo Ide, and Brian R. Hunt

climate experiments. While containing many of the physics components found in larger models (including convection, condensation, cloud, radiation, and surface flux parameterizations), it is computationally inexpensive so it can be run on a single processor. There are seven vertical levels using the sigma coordinate system, with a horizontal spectral resolution of T30, which corresponds to a standard Gaussian grid of 96 by 48 points. The time scheme is leapfrog. There are five dynamical variables

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Craig H. Bishop and Daniel Hodyss

-based 4D-VAR system currently used for operational weather forecasting. El Akkraoui et al. (2008) refer to this observation space form as the dual form of 4D-VAR. While the NAVDAS-AR code was under construction many aspects of it were in a rapid state of flux. In addition, the authors were unsure about how best to incorporate AECL and/or NECL within NAVDAS-AR. For these reasons, a decision was made to create a prototype observation space ensemble 4D-VAR using both NECL and AECL outside of the

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