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James A. Cummings and Ole Martin Smedstad

. In this nonrheological system, ice grows or melts as a function of SST and heat fluxes. NCODA is an oceanographic implementation of the Naval Research Laboratory Atmospheric Variational Data Assimilation System (NAVDAS), a three-dimensional variational data assimilation (3DVAR) technique developed for navy NWP systems ( Daley and Barker 2001 ). The NCODA 3DVAR analysis variables are temperature, salinity, geopotential (dynamic height), and u , υ vector velocity components. All ocean variables

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David Halpern, Dimitris Menemenlis, and Xiaochun Wang

conservation laws of heat, salinity, and momentum for the complete assimilation period. In particular, ECCO2 solutions do not contain discontinuities when and where data are ingested. State estimation is very different from meteorological data assimilation because the latter does not conserve energy, freshwater, or heat, and is dynamically inconsistent with gravity wave shocks produced at each assimilation period. ECCO2 solutions generated without and with data assimilation are referred to as Baseline and

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