& CFC_forcingPeriod, CFC_forcingCycle,
_RL CFC_forcingPeriod
CALL WRITE_0D_RL( CFC_forcingPeriod, INDEX_NONE,
I CFC_forcingCycle, CFC_forcingPeriod,
& CFC_forcingPeriod, CFC_forcingCycle
CFC_forcingPeriod = externForcingPeriod