Driver

The Omega Driver manages the execution of the Omega ocean model. Currently, the only user-configurable parameters unique to the Driver relate to the time management of the simulation.

   TimeManagement:
      StartTime: 0001-01-01_00:00:00
      StopTime: none
      RunDuration: 0000_02:00:00.000
      CalendarType: No Leap

The StartTime and StopTime should be formatted strings in the form YYYY-MM-DD_HH:MM:SS.SSSS and the RunDuration should be a formatted string in one of the following forms:

• DDDD_HH:MM:SS(.sss...)

• HH:MM:SS(.sss...)

• MM:SS(.sss...)

• SS(.sss...)

The actual width of each unit can be arbitrary and the separators can be any single non-numeric character. Either the StopTime or RunDuration can be set to none in order to use the other to determine the duration of the run. If both are set and StopTime - StartTime is incosistent with RunDuration, then RunDuration is used for the simulation. The supported calendar types are:

Config option name	Calendar type
Gregorian	Gregorian calendar
No Leap	Gregorian without leap years
Julian	Julian calendar
Julian Day	Julian day
Modified Julian Day	modified Julian day
360 Day	12 months, 30 days each
Custom	user-defined calendar
No Calendar	tracks elapsed time only

Coupled mode

When Omega runs as the ocn component of E3SM, StartTime, StopTime, and RunDuration are not read from omega.yml; the E3SM case’s start time and the coupler’s clock control the simulation instead, and omega/cime_config/buildnml writes placeholder values for these three options. CalendarType is still set, from the case’s CALENDAR XML variable.