Oceananigans tripolar surface snapshot (ClimaOcean 1-degree, day 10) — xgcm tripolar-fold example fixture

A single surface snapshot from a realistic 1° global ocean–sea-ice simulation (ClimaOcean / Oceananigans, TripolarGrid), used by the xgcm 06_tripolar_fold.ipynb example to demonstrate that diff/interp work correctly across the bipolar north fold of a tripolar grid. Version note (v1 → v2). This deposit is v1, a snapshot at model-day 10 — long enough to spin the surface circulation past the initial barotropic adjustment, short enough to produce locally on a CPU in a few hours. It will be superseded by v2, a snapshot after a full model year (day 365) of spinup. Load a specific version DOI (not the concept DOI) so the v2 swap is a one-line change. File oceananigans_tripolar.nc (netCDF-4, 1° tripolar grid, Nx×Ny = 360×180). Surface fields on the staggered Arakawa C-grid plus curvilinear lon/lat at each location: tracer (y_c, x_c) — surface temperature [°C], cell centre u (y_c, x_f) — zonal velocity [m/s], east face v (y_f, x_c) — meridional velocity [m/s], north face lon_cc/lat_cc, lon_fc/lat_fc, lon_cf/lat_cf, lon_ff/lat_ff — geographic coords at centre, u-face, v-face, and corner Provenance. ClimaOcean coupled ocean–sea-ice on an Oceananigans TripolarGrid (360×180×50, ETOPO bathymetry, 2 major basins); initial condition from the ECCO4 monthly state estimate (1993-01-01); JRA55-do prescribed atmospheric forcing; surface snapshot at model-day 10. Reproducing. The deposit includes the 10-day generation script (run_one_degree_simulation.jl), the netCDF converter (jld2_to_netcdf.jl), and the pinned Julia environment (climaocean_env.zip: Project.toml, Manifest.toml, install.jl). See README.md for the exact commands. License: CC-BY-4.0.