shift_cts_upward.F90

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!+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
!
!  Subroutine :  s h i f t _ c t s _ u p w a r d
!
!> @file
!!
!! Upward shifting of the CTS.
!!
!! @section Copyright
!!
!! Copyright 2009-2013 Ralf Greve
!!
!! @section License
!!
!! This file is part of SICOPOLIS.
!!
!! SICOPOLIS is free software: you can redistribute it and/or modify
!! it under the terms of the GNU General Public License as published by
!! the Free Software Foundation, either version 3 of the License, or
!! (at your option) any later version.
!!
!! SICOPOLIS is distributed in the hope that it will be useful,
!! but WITHOUT ANY WARRANTY; without even the implied warranty of
!! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
!! GNU General Public License for more details.
!!
!! You should have received a copy of the GNU General Public License
!! along with SICOPOLIS.  If not, see <http://www.gnu.org/licenses/>.
!<
!+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

!-------------------------------------------------------------------------------
!> Upward shifting of the CTS.
!<------------------------------------------------------------------------------
subroutine shift_cts_upward(at1, at2_1, at2_2, at3_1, at3_2, &
              at4_1, at4_2, at5, at6, at7, atr1, am1, am2, alb1, &
              aw1, aw2, aw3, aw4, aw5, aw7, aw8, aw9, aqtld, &
              ai1, ai2, ai3, mean_accum_inv, dzeta_t, &
              dtime_temp, dtt_2dxi, dtt_2deta, dtime_temp_inv, &
              i, j)

use sico_types
use sico_variables

implicit none
integer(i4b) :: i, j
real(dp) :: zm_shift
real(dp) :: at1(0:kcmax), at2_1(0:kcmax), at2_2(0:kcmax), &
            at3_1(0:kcmax), at3_2(0:kcmax), at4_1(0:kcmax), &
            at4_2(0:kcmax), at5(0:kcmax), at6(0:kcmax), at7, &
            ai1(0:kcmax), ai2(0:kcmax), ai3, &
            atr1, am1, am2, alb1
real(dp) :: aw1, aw2, aw3, aw4, aw5, aw7, aw8, aw9, aqtld
real(dp) :: mean_accum_inv
real(dp) :: dtt_2dxi, dtt_2deta, dtime_temp, dtime_temp_inv, dzeta_t
real(dp) :: difftemp_a, difftemp_b, interpol

zm_shift = 1.0_dp   ! CTS shift in intervals of 1 m

!-------- Temperature discrepancy from the computation of the main
!         program --------

difftemp_a = temp_c_neu(0,j,i)-(-beta*h_c_neu(j,i))
if (difftemp_a.le.0.0_dp) return

!-------- Shift CTS upward until it is too high --------

   10 continue

   zm_neu(j,i)  = zm_neu(j,i)  + zm_shift
   if (zm_neu(j,i).ge.zs(j,i)) then
      zm_neu(j,i)  = zm_neu(j,i) - zm_shift
      return
   end if
   h_c_neu(j,i) = h_c_neu(j,i) - zm_shift
   h_t_neu(j,i) = h_t_neu(j,i) + zm_shift

   dh_t_dtau(j,i) = (zm_neu(j,i)-zm(j,i))*dtime_temp_inv
   dzm_dtau(j,i)  = dzb_dtau(j,i)+dh_t_dtau(j,i)
   dh_c_dtau(j,i) = dzs_dtau(j,i)-dzm_dtau(j,i)

   am_perp(j,i) = am_perp_st(j,i) + dzm_dtau(j,i)

   call calc_temp3(at1, at2_1, at2_2, at3_1, at3_2, &
                 at4_1, at4_2, at5, at6, at7, atr1, &
                 am1, am2, alb1, &
                 aw1, aw2, aw3, aw4, aw5, aw7, aw8, aw9, aqtld, &
                 ai1, ai2, ai3, mean_accum_inv, dzeta_t, &
                 dtime_temp, dtt_2dxi, dtt_2deta, i, j)

   difftemp_b = difftemp_a
   difftemp_a = temp_c_neu(0,j,i)-(-beta*h_c_neu(j,i))

if (difftemp_a.gt.0.0_dp) go to 10

!-------- Interpolate the CTS position from the last (_a) and the
!         last but one (_b) value, weighed with the temperature
!         discrepancies at the CTS --------

interpol = difftemp_a/(difftemp_b-difftemp_a)*zm_shift

zm_neu(j,i)  = zm_neu(j,i)  + interpol
h_c_neu(j,i) = h_c_neu(j,i) - interpol
h_t_neu(j,i) = h_t_neu(j,i) + interpol

dh_t_dtau(j,i) = (zm_neu(j,i)-zm(j,i))*dtime_temp_inv
dzm_dtau(j,i)  = dzb_dtau(j,i)+dh_t_dtau(j,i)
dh_c_dtau(j,i) = dzs_dtau(j,i)-dzm_dtau(j,i)

am_perp(j,i) = am_perp_st(j,i) + dzm_dtau(j,i)

call calc_temp3(at1, at2_1, at2_2, at3_1, at3_2, &
                at4_1, at4_2, at5, at6, at7, atr1, &
                am1, am2, alb1, &
                aw1, aw2, aw3, aw4, aw5, aw7, aw8, aw9, aqtld, &
                ai1, ai2, ai3, mean_accum_inv, dzeta_t, &
                dtime_temp, dtt_2dxi, dtt_2deta, i, j)

end subroutine shift_cts_upward
!