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!                     version 3; Last Modified: May 7, 2008.
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***s/r itf_chm_prep - load all fields required by the chemistry, as well: read
*                  (if need be) emission field from file.
*
#include "model_macros_f.h"
*

      subroutine itf_chm_prep(P_trp,P_trm) 1,1
*
      implicit none
*
      integer*8  P_trp(*), P_trm(*)
*
*author 
*     A. Kallaur - arqi - june 2005
*
*revision
* v3_30 - Kallaur A.       - initial version
*
*object
*
*arguments
*  Name        I/O                 Description
*----------------------------------------------------------------
* P_trp         O                  Pointers to tracer fields at time t+
* P_trm         O                  Pointers to tracer fields at time t-
* Nk            I                  Number of vertical levels to consider
*----------------------------------------------------------------
*
*implicits
*
#include "glb_ld.cdk"
#include "ptopo.cdk"
#include "itf_chm_bus.cdk"
#include "schm.cdk"
#include "lctl.cdk"
#include "cstv.cdk"
#include "out3.cdk"
*
*     ---------------------------------------------------------------
*
!     No business being here if chemistry scheme 
!     flag is off (Schm_chems_L=.false.)
!
      if (.not. Schm_chems_L) return
!
!     Load the DYN fields (tracers) from VMM
!
      call itf_chm_vmmprep(P_trp,P_trm,LDIST_DIM,l_nk)
!
!     Load emission field from file (if need be).

      call chm_load_emissions(chm_busper3D,
     *                        chm_bper_siz,chm_bper_siz*chm_nj,
     *                        Out3_date,Cstv_dt_8,Lctl_step)
*
*     ---------------------------------------------------------------
*      
      return
      end