Procedures for offline grid nesting in regional ocean modelsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 29 сентября 2021 г.
Аннотация:One-way offline nesting of a primitive-equation regional ocean numerical model (ROMS) is investigated,with special attention to the boundary forcing file creation process. The model has a modified openboundary condition which minimises false wave reflections, and is optimised to utilise high-frequencyboundary updates. The model configuration features a previously computed solution which suppliesboundary forcing data to an interior domain with an increased grid resolution. At the open boundariesof the interior grid (the child) the topography is matched to that of the outer grid (the parent), over a narrowtransition region. A correction is applied to the normal baroclinic and barotropic velocities at theopen boundaries of the child to ensure volume conservation. It is shown that these steps, together witha carefully constructed interpolation of the parent data, lead to a high-quality child solution, with minimalartifacts such as persistent rim currents and wave reflections at the boundaries.Sensitivity experiments provide information about the robustness of the model open boundary conditionto perturbations in the surface wind stress forcing field, to the perturbation of the volume conservationenforcement in the boundary forcing, and to perturbation of the vertical density structure in theboundary forcing. This knowledge is important when extending the nesting technique to include externaldata from alien sources, such as ocean models with physics and/or numerics different from ROMS, orfrom observed climatologies of temperature, salinity and sea level.