{
  "internal_state": {
    "required": true,
    "provider": "Copernicus Marine",
    "variables": [
      "sst",
      "sss",
      "ssh",
      "u_surface",
      "v_surface",
      "u_100m",
      "v_100m",
      "temperature_100m",
      "salinity_100m",
      "significant_wave_height",
      "peak_wave_period",
      "tm02",
      "peak_wave_direction_sin",
      "peak_wave_direction_cos",
      "wind_sea_significant_height",
      "primary_swell_significant_height"
    ],
    "role": "South China Sea internal prognostic state"
  },
  "atmosphere": {
    "required": true,
    "provider": "ERA5/CDS",
    "variables": [
      "u10",
      "v10",
      "wind_speed",
      "tau_x",
      "tau_y",
      "msl",
      "net_heat_flux",
      "freshwater_flux",
      "wind_stress_curl"
    ],
    "role": "Atmospheric forcing and air-sea flux context"
  },
  "outer_ocean_boundary": {
    "required": true,
    "provider": "Copernicus Marine",
    "variables": [
      "boundary_normal_inflow",
      "boundary_ssh",
      "boundary_sst",
      "boundary_sss",
      "boundary_u_surface",
      "boundary_v_surface",
      "boundary_temperature_100m",
      "boundary_salinity_100m",
      "boundary_u_100m",
      "boundary_v_100m"
    ],
    "role": "Outer-domain state projected to the South China Sea boundary"
  },
  "vertical_context": {
    "required": true,
    "provider": "Copernicus Marine",
    "variables": [
      "mld_temperature_proxy",
      "thermocline_depth_proxy",
      "ohc_0_200_proxy",
      "temperature_0_100_difference",
      "salinity_0_100_difference",
      "current_shear_0_100",
      "density_stratification_0_100",
      "temperature_100_200_difference",
      "salinity_100_200_difference",
      "current_shear_100_200"
    ],
    "role": "Multi-level stratification and slow-state context"
  },
  "tide": {
    "required": false,
    "provider": "User TPXO/FES field or phase-only fallback",
    "variables": [
      "tide_elevation",
      "tide_u",
      "tide_v",
      "m2_sin",
      "m2_cos",
      "s2_sin",
      "s2_cos",
      "k1_sin",
      "k1_cos",
      "o1_sin",
      "o1_cos"
    ],
    "role": "Deterministic tidal phase and optional spatial tide field"
  },
  "river": {
    "required": false,
    "provider": "User gauge/GloFAS adapter",
    "variables": [
      "river_discharge_map",
      "river_discharge_anomaly"
    ],
    "role": "Freshwater boundary source"
  },
  "events": {
    "required": false,
    "provider": "Official event registry supplied by the user",
    "variables": [
      "event_intensity",
      "event_confidence",
      "event_type_code"
    ],
    "role": "Sparse high-value special phenomenon context"
  }
}