| Summary: | This repository includes a regional Arctic configuration of the Massachusetts Institute of Technology general circulation model (MITgcm, Marshall et al., 1997 MITgcm Group, 2017 ) with ahorizontal resolution of 2 km, which is described in Hutter & Losch (2020) . It is based on a regional Arctic configuration ( Nguyen et al., 2012 ) of the MITgcm, which represents the Northern face of a global cubed sphere configuration. The number of vertical layers is reduced to 16, with the first 5 layers covering the uppermost 120 m to decrease the computational cost associated with the ocean model component. The Refined Topography dataset 2 (RTopo-2) ( Schaffer and Timmermann, 2016 ) is used as bathymetry for the entire model domain. The lateral boundary conditions are taken from the globally optimized ECCO-2 simulations (Menemenlis et al., 2008). The configuration is designed to use the 3-hourly Japanese 55-year Reanalysis (JRA-55, Kobayashi et al., 2015 ) with a spatial resolution of 0.5625°for surface boundary conditions. The ocean temperature and salinity are initialized on 1 January, 1992, from the World Ocean Atlas 2005 (Locarnini et al., 2006; Antonov et al., 2006). The initial conditions for sea ice are taken from the Polar Science Center ( Zhang et al., 2003 ). Ocean and sea ice parameterizations and parameters are directly taken from Nguyen et al. (2011) , with the ice strength P=2.264×104Nm−2. The configuration uses the classical discrimination of two ice classes: thin and thick ice ( Hibler, 1979 ). The momentum equations are solved by an iterative method and line successive relaxation (LSR) of the linearized equations following Zhang and Hibler (1997) . In each time step ( \(\Delta\) t=120 s), 10 nonlinear steps are made and the linear problem is iterated until an accuracy of 10e−5 is reachedor 500iterations are performed. With thisconfiguration,simulations wererunfrom 1January 1992 to 31 December 2012. We also provide pickup files to restart the simulation in 2012. To reference this configuration please ...
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