The namelist parameters listed in Table 4 are for adding tracers. See section on tracers.
| Varible | Type | Default Value | Description |
| tr_iage | Logical | .true. | Ice age passive tracer |
| tr_FY | Logical | .true. | First-year ice area passive tracer |
| tr_lvl | Logical | .false. | Level ice area passive tracer |
| tr_pond | Logical | .true. | Melt pond physics and tracer |
| tr_aero | Logical | .true. | Aerosol physics and tracer |