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Andrew M. Moore¹

(1) Institute of Marine Sciences, Santa Cruz, USA

Main authors appear in bold

The Regional Ocean Modeling System (ROMS) is one of the most popular community ocean modeling tools in the U.S.ROMS is a free surface, terrain following coordinate, split explicit model designed specifically for modeling coastal and limited area circulations. Four versions of ROMS exist: the nonlinear model, the perturbation tangent linear model, the adjoint model, and the finite-amplitude tangent linear model. Recently, a suite of 4d-variational data assimilation tools (4DVAR) have been developed for ROMS including an incremental strong constraint formulation (IS4DVAR), and a representer-based weak constraint formulation (W4DVAR). In IS4DVAR the search for the optimal state estimate is performed in model space, while in W4DVAR the search is performed in observation space. In addition to the 4DVAR tools, a suite of eigen analysis and singular value decomposition tools have been developed utilizing the tangent and adjoint versions of ROMS. Collectively referred to as the Generalized Stability Analysis Toolkit, these tools can be used to derive 4DVAR preconditioners, create perturbations for ensemble prediction, and to explore the fundamental properties of the underlying ocean dynamics.
ROMS and all the above tools are freely available to the ocean modeling community at large, and constitute a powerful community resource. In this presentation I will give an overview of the ROMS system and toolkits, and present illustrative examples.

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