!/===========================================================================/
! Copyright (c) 2007, The University of Massachusetts Dartmouth 
! Produced at the School of Marine Science & Technology 
! Marine Ecosystem Dynamics Modeling group
! All rights reserved.
!
! FVCOM has been developed by the joint UMASSD-WHOI research team. For 
! details of authorship and attribution of credit please see the FVCOM
! technical manual or contact the MEDM group.
!
! 
! This file is part of FVCOM. For details, see http://fvcom.smast.umassd.edu 
! The full copyright notice is contained in the file COPYRIGHT located in the 
! root directory of the FVCOM code. This original header must be maintained
! in all distributed versions.
!
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
! AND ANY EXPRESS OR  IMPLIED WARRANTIES, INCLUDING,  BUT NOT  LIMITED TO,
! THE IMPLIED WARRANTIES OF MERCHANTABILITY AND  FITNESS FOR A PARTICULAR
! PURPOSE ARE DISCLAIMED.  
!
!/---------------------------------------------------------------------------/
! CVS VERSION INFORMATION
! $Id$
! $Name$
! $Revision$
!/===========================================================================/

SUBROUTINE ICING(NOW)
  USE MOD_UTILS
  USE MOD_FORCE
  USE ALL_VARS
  USE MOD_TIME
  IMPLICIT NONE
  TYPE(TIME), INTENT(IN) :: NOW
  REAL(SP), PARAMETER :: Tfreeze = -1.75_SP 
  REAL(SP), DIMENSION(0:MT) :: ICING_WNDSPD

  IF(DBG_SET(DBG_LOG)) write(ipt,*) "Start Icing Update"

  ! GET THE FORCING DATA
  CALL UPDATE_ICING(NOW,ICING_SATMP,ICING_WNDX,ICING_WNDY)
  
  ICING_WNDSPD = sqrt(icing_wndy**2 + icing_wndx**2)
  ICING_WNDSPD(0) = 0.0_sp
  

  IF(DBG_SET(DBG_IO))THEN
     WRITE(IPT,*) "min/max(SAT)",MINVAL(ICING_SATMP(1:MT)),MAXVAL(ICING_SATMP(1:MT))
     WRITE(IPT,*) "min/max(WNDSPD)",MINVAL(ICING_WNDSPD(1:MT)),MAXVAL(ICING_WNDSPD(1:MT))
     WRITE(IPT,*) "min/max(T1(:,1))",MINVAL(T1(1:MT,1)),MAXVAL(T1(1:MT,1))
  END IF
  
  ICING_0kts = (Tfreeze - ICING_SATMP) /&
       (1.0_SP + 0.4_SP *(T1(:,1) -Tfreeze))
  
  WHERE (ICING_0kts < 0.0_SP) ICING_0kts = 0.0_SP

  ICING_10kts = (ICING_WNDSPD + 5.0_SP) * ICING_0kts

  ICING_0kts = ICING_0kts * ICING_WNDSPD
  

END SUBROUTINE ICING