| Symbol | Description | Uses |
| OB_Ieast | 9 | |
| OB_Iwest | 6 | |
| OB_Jnorth | 9 | |
| OB_Jsouth | 6 | |
| OBCS_PARM01 | 2 | |
| OBCS_PARM02 | 2 | |
| OBCS_PARM03 | 2 | |
| obcsEperiod | 6 | |
| obcsEstartdate1 | 6 | |
| obcsEstartdate2 | 6 | |
| obcsglo | 5 | |
| obcsNperiod | 7 | |
| obcsNstartdate1 | 6 | |
| obcsNstartdate2 | 6 | |
| OBCSprintDiags | 5 | |
| obcsSperiod | 6 | |
| obcsSstartdate1 | 6 | |
| obcsSstartdate2 | 6 | |
| obcsWperiod | 5 | |
| obcsWstartdate1 | 6 | |
| obcsWstartdate2 | 6 | |
| OBEsFile | 11 | |
| OBEtFile | 11 | |
| OBEuFile | 11 | |
| OBEvFile | 11 | |
| OBNsFile | 11 | |
| OBNtFile | 11 | |
| OBNuFile | 11 | |
| OBNvFile | 11 | |
| OBSsFile | 11 | |
| OBStFile | 11 | |
| OBSuFile | 11 | |
| OBSvFile | 11 | |
| OBWsFile | 11 | |
| OBWtFile | 11 | |
| OBWuFile | 11 | |
| OBWvFile | 11 | |
| ocean_deltaT | ocean mixed-layer time-step | 10 |
| OCEAN_drag | 8 | |
| ocean_emissivity | 18 | |
| OFFLINE_PARM01 | 2 | |
| OFFLINE_PARM02 | 2 | |
| offlineForcingCycle | 6 | |
| offlineForcingPeriod | 6 | |
| offlineIter0 | 30 | |
| offlineOffsetIter | 5 | |
| omega | Angular velocity ( rad/s ) | 13 |
| OPPS_PARM01 | 2 | |
| OPPSdebugLevel | 12 | |
| OPPSdumpFreq | 4 | |
| OPPStaveFreq | 6 | |
| OPPSwriteState | 4 | |
| OPTIM | 1 | |
| optim | 3 | |
| optimcycle | 684 | |
| outputTypesInclusive | 39 |