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David Halpern, Dimitris Menemenlis, and Xiaochun Wang

-latitude eddy motions ( Hallberg 2013 ) and the EUC and NECC north–south boundaries. ECCO2 solutions are obtained by fitting a global, full-depth ocean and sea ice configuration of the Massachusetts Institute of Technology general circulation model (MITgcm) to satellite and in situ observations using the adjoint method ( Wunsch and Heimbach 2007 ; Wunsch et al. 2009 ). The adjoint method permits solutions that minimize a weighted quadratic difference between OGCM and observations while satisfying OGCM

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James A. Cummings and Ole Martin Smedstad

applicability of traditional isopycnic coordinate circulation models toward shallow coastal seas and unstratified parts of the World Ocean. It maintains the significant advantages of an isopycnal model in stratified regions while allowing more vertical resolution near the surface and in shallow coastal areas, hence providing a better representation of the upper-ocean physics. HYCOM is configured with options for a variety of mixed-layer submodels. This version uses the K -profile parameterization (KPP) of

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