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ECCO2: High Resolution Global Ocean and Sea Ice Data Synthesis
8 auth. D. Menemenlis, J. Campin, P. Heimbach, C. Hill, T. Lee, A. Nguyen, ...
The Estimating the Circulation and Climate of the Ocean (ECCO) project was established in 1998 as part of the World Ocean Circulation Experiment (WOCE) with the goal of combining a general circulation model (GCM) with diverse observations in order t…
The Estimating the Circulation and Climate of the Ocean (ECCO) project was established in 1998 as part of the World Ocean Circulation Experiment (WOCE) with the goal of combining a general circulation model (GCM) with diverse observations in order to produce a quantitative depiction of the time-evolving global ocean state. Such combinations, also known as data assimilation, are important because available remotely sensed and in-situ observations are sparse and incomplete compared to the scales and properties of ocean circulation. These combinations also provide rigorous consistency tests for models and for data. In contrast to numerical weather prediction that also combines models and data, ECCO estimates are physically consistent; in particular, ECCO estimates do not contain discontinuities when and where data are ingested. First generation ECCO solutions are available and widely used for numerous science applications but the coarse horizontal grid spacing and the lack of Arctic Ocean and of sea ice of these first-generation solutions limits their ability to describe the real ocean. To address these shortcomings, the follow-on ECCO, Phase II (ECCO2) project aims to produce a best-possible, global, time-evolving synthesis of most available ocean and sea-ice data at a resolution that admits ocean eddies. A first ECCO2 synthesis for the period 1992– 2007 has been obtained using a Green's Function approach (Menemenlis, et al., 2005a) to estimate initial temperature and salinity conditions, surface boundary conditions, and several empirical ocean and sea ice model parameters. Data constraints include altimetry, gravity, drifter, hydrography, and observations of sea-ice. A large complement of high-frequency and highresolution diagnostics has been saved; these diagnostics are made available to the scientific community via ftp and OPeNDAP servers at http://ecco2.org. This note provides a brief overview of this first ECCO2 synthesis and of some early science applications.
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110
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8 | 2008 |
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