IF ( usePP81 ) THEN
IF (usePP81) CALL PP81_CHECK( myThid )
IF (usePP81) CALL PACKAGES_CHECK_ERROR('PP81', myThid)
IF (usePP81) THEN
useVariableK = useKPP .OR. usePP81 .OR. useMY82 .OR. useGGL90
& usePP81,
usePP81=.FALSE.
IF (usePP81 .AND. myIter.NE.nIter0 )
IF (usePP81) CALL PP81_READPARMS( myThid )
LOGICAL usePP81
& usePP81, useMY82, useOPPS, useGGL90, useMATRIX,
IF (usePP81) CALL PP81_CALC_VISC(