BUSINGER_PHIE_0D Function

FUNCTION BUSINGER_PHIE_0D(PZ_O_LMO)
  USE MODD_CANOPY_TURB, ONLY : XALPSBL
  IMPLICIT NONE  
  REAL, INTENT(IN):: PZ_O_LMO
  REAL            :: BUSINGER_PHIE_0D
  REAL(KIND=JPRB) :: ZHOOK_HANDLE
!
  IF (LHOOK) CALL DR_HOOK('MODE_SBLS:BUSINGER_PHIE_0D',0,ZHOOK_HANDLE)
  IF ( PZ_O_LMO < 0. ) THEN
    BUSINGER_PHIE_0D =   (1.+(-PZ_O_LMO)**(2./3.)/XALPSBL) &
                         * (1.-15.*PZ_O_LMO)**(0.5)  
  ELSE
    BUSINGER_PHIE_0D = 1./(1. + 4.7 * PZ_O_LMO)**2
  END IF
IF (LHOOK) CALL DR_HOOK('MODE_SBLS:BUSINGER_PHIE_0D',1,ZHOOK_HANDLE)
END FUNCTION BUSINGER_PHIE_0D