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The sigma coordinate system is a common coordinate system used in computational models for oceanography, meteorology and other fields where fluid dynamics are relevant. This coordinate system receives its name from the independent variable σ {\displaystyle \sigma } used to represent a scaled pressure level.
Models that use a sigma coordinate system include the Princeton Ocean Model , the COupled Hydrodynamical Ecological model for REgioNal Shelf seas , the ECMWF Integrated Forecast System, and various other numerical weather prediction models.
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