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Synopsis of the ECCO Central Production Global Ocean and Sea-Ice State Estimate

ECCO Consortium; Fukumori, Ichiro; Wang, Ou; Fenty, Ian; Forget, Gael; Heimbach, Patrick; Ponte, Rui M.


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    <subfield code="a">&lt;p&gt;This note provides a brief synopsis of ECCO Version 4 Release 4 (R4), an updated edition to&lt;br&gt;
the global ocean state estimate described by Forget et al. (2015b, 2016) and Fukumori et al.&lt;br&gt;
(2017). Release 4 is available at https://ecco.jpl.nasa.gov/drive/files/Version4/Release4.&lt;br&gt;
As of this writing, Version 4 represents the latest ocean state estimate of the Consortium for&lt;br&gt;
Estimating the Circulation and Climate of the Ocean (ECCO) (Wunsch et al., 2009; Wunsch and&lt;br&gt;
Heimbach, 2013) that synthesizes nearly all modern observations with an ocean circulation&lt;br&gt;
model (MITgcm, originally described by Marshall et al., 1997) into coherent, physically&lt;br&gt;
consistent descriptions of the ocean&amp;rsquo;s time-evolving state covering the era of satellite altimetry.&lt;br&gt;
Among its characteristics, Version 4 (Forget et al., 2015b; Release 1 [R1]) is the first multidecadal&lt;br&gt;
ECCO estimate (1992-2011) that is truly global, including the Arctic Ocean. Unlike&lt;br&gt;
previous versions, the model uses a nonlinear free surface formulation and real freshwater flux&lt;br&gt;
boundary condition, permitting a more accurate simulation of sea level change. In addition to&lt;br&gt;
estimating forcing and initial conditions as done in earlier analyses, the Version 4 estimate also&lt;br&gt;
adjusts the model&amp;rsquo;s mixing parameters that enables an improved fit to observations (Forget et al.,&lt;br&gt;
2015a). The Version 4 synthesis also incorporates a diffusion operator in evaluating model-data&lt;br&gt;
misfits (Forget and Ponte, 2015) and controls (Weaver and Courtier, 2001), accounting for some&lt;br&gt;
of the spatial correlation that exist among these elements.&lt;/p&gt;</subfield>
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