Cloud-to-ground lightning flash frequency coupling

cesm/nuopc_cap_share/shr_lightning_coupling_mod.F90

@@ -0,0 +1,112 @@
+module shr_lightning_coupling_mod
+
+  !========================================================================
+  ! Module for handling namelist variables related to lightning coupling
+  !========================================================================
+
+  use ESMF         , only : ESMF_VMGetCurrent, ESMF_VM, ESMF_VMGet
+  use ESMF         , only : ESMF_LOGERR_PASSTHRU, ESMF_SUCCESS
+  use ESMF         , only : ESMF_VMBroadCast, ESMF_Logical, assignment(=)
+  use shr_sys_mod  , only : shr_sys_abort
+  use shr_log_mod  , only : shr_log_getLogUnit
+  use shr_nl_mod   , only : shr_nl_find_group_name
+  use nuopc_shr_methods, only : chkerr
+
+  implicit none
+  private
+
+  ! !PUBLIC MEMBER FUNCTIONS
+  public shr_lightning_coupling_readnl  ! Read namelist
+
+  character(len=*), parameter :: &
+       u_FILE_u=__FILE__
+
+  !====================================================================================
+CONTAINS
+  !====================================================================================
+
+  subroutine shr_lightning_coupling_readnl(NLFilename, atm_provides_lightning_out)
+
+    !========================================================================
+    ! reads lightning_coupling_nl namelist and returns a variable specifying
+    ! if atmosphere model provides lightning flash frequency field to mediator
+    !========================================================================
+
+    ! input/output variables
+    character(len=*), intent(in)  :: NLFilename ! Namelist filename
+    logical, intent(out) :: atm_provides_lightning_out ! if TRUE atm will provide lightning flash frequency
+
+    !----- local -----
+    logical :: atm_provides_lightning
+    type(ESMF_VM)     :: vm
+    integer           :: unitn                  ! namelist unit number
+    integer           :: ierr                   ! error code
+    logical           :: exists                 ! if file exists or not
+    type(ESMF_Logical):: ltmp(1)
+    integer           :: rc
+    integer           :: localpet
+    integer           :: mpicom
+    integer           :: s_logunit
+    character(len=*), parameter :: atm_ozone_frequency_not_present = 'NOT_PRESENT'
+    character(len=*), parameter :: subname = '(shr_lightning_coupling_readnl) '
+    ! ------------------------------------------------------------------
+
+    namelist /lightning_coupling_nl/ atm_provides_lightning
+
+    rc = ESMF_SUCCESS
+
+    atm_provides_lightning_out = .false.
+    ltmp(1) = .false.
+
+    !--- Open and read namelist ---
+    if ( len_trim(NLFilename) == 0 ) then
+       call shr_sys_abort( subname//'ERROR: nlfilename not set' )
+    end if
+    call shr_log_getLogUnit(s_logunit)
+    call ESMF_VMGetCurrent(vm, rc=rc)
+    if (chkerr(rc,__LINE__,u_FILE_u)) return
+
+    call ESMF_VMGet(vm, localPet=localpet, mpiCommunicator=mpicom, rc=rc)
+    if (chkerr(rc,__LINE__,u_FILE_u)) return
+
+    if (localpet==0) then
+       ! ------------------------------------------------------------------------
+       ! Set default values in case namelist file doesn't exist, lightning_coupling_nl group
+       ! doesn't exist within the file, or a given variable isn't present in the namelist
+       ! group in the file.
+       ! ------------------------------------------------------------------------
+       atm_provides_lightning = .false.
+
+       ! ------------------------------------------------------------------------
+       ! Read namelist file
+       ! ------------------------------------------------------------------------
+       inquire( file=trim(NLFileName), exist=exists)
+       if ( exists ) then
+          open(newunit=unitn, file=trim(NLFilename), status='old' )
+          write(s_logunit,'(a)') subname,'Read in lightning_coupling_nl namelist from: ', trim(NLFilename)
+          call shr_nl_find_group_name(unitn, 'lightning_coupling_nl', ierr)
+          if (ierr == 0) then
+             ! Note that ierr /= 0 means no namelist is present.
+             read(unitn, lightning_coupling_nl, iostat=ierr)
+             if (ierr > 0) then
+                call shr_sys_abort(subname//'problem reading lightning_coupling_nl')
+             end if
+          end if
+          close( unitn )
+       end if
+
+       ltmp(1) = atm_provides_lightning
+
+    end if
+
+    ! ------------------------------------------------------------------------
+    ! Broadcast values to all tasks
+    ! ------------------------------------------------------------------------
+    call ESMF_VMBroadcast(vm,  ltmp, count=1, rootPet=0, rc=rc)
+    if (chkerr(rc,__LINE__,u_FILE_u)) return
+
+    atm_provides_lightning_out = ltmp(1)
+
+  end subroutine shr_lightning_coupling_readnl
+
+end module shr_lightning_coupling_mod

cime_config/namelist_definition_drv_flds.xml

@@ -142,7 +142,7 @@
   </entry>
 
   <!-- ========================================================================================  -->
-  <!-- Ozone control                                                                              -->
+  <!-- Ozone control                                                                             -->
   <!-- ========================================================================================  -->
 
   <entry id="atm_ozone_frequency">
@@ -157,4 +157,17 @@
     </desc>
   </entry>
 
+  <!-- ========================================================================================  -->
+  <!-- Lightning                                                                                 -->
+  <!-- ========================================================================================  -->
+
+  <entry id="atm_provides_lightning">
+    <type>logical</type>
+    <category>lightning_coupling</category>
+    <group>lightning_coupling_nl</group>
+    <desc>
+      If TRUE atmosphere model will provide prognosed lightning flash frequency (flashes per minute).
+    </desc>
+  </entry>
+
 </entry_id>

mediator/esmFldsExchange_cesm_mod.F90

@@ -399,6 +399,19 @@ subroutine esmFldsExchange_cesm(gcomp, phase, rc)
        end if
     end if
     ! ---------------------------------------------------------------------
+    ! to lnd: cld to grnd lightning flash freq
+    ! ---------------------------------------------------------------------
+    if (phase == 'advertise') then
+       call addfld_from(compatm, 'Sa_lightning')
+       call addfld_to(complnd, 'Sa_lightning')
+    else
+       if ( fldchk(is_local%wrap%FBexp(complnd)         , 'Sa_lightning', rc=rc) .and. &
+            fldchk(is_local%wrap%FBImp(compatm,compatm ), 'Sa_lightning', rc=rc)) then
+          call addmap_from(compatm, 'Sa_lightning', complnd, mapbilnr, 'one', atm2lnd_map)
+          call addmrg_to(complnd, 'Sa_lightning', mrg_from=compatm, mrg_fld='Sa_lightning', mrg_type='copy')
+       end if
+    end if
+    ! ---------------------------------------------------------------------
     ! to lnd: temperature at the lowest model level from atm
     ! ---------------------------------------------------------------------
     if (phase == 'advertise') then

mediator/fd_cesm.yaml

@@ -325,6 +325,10 @@
        canonical_units: mol/mol
        description: atmosphere export - O3 in the lowest model layer (prognosed or prescribed)
      #
+     - standard_name: Sa_lightning
+       canonical_units: /min
+       description: atmosphere export - lightning flash freqency
+     #
      - standard_name: Sa_topo
        alias: inst_surface_height
        canonical_units: m
@@ -745,7 +749,7 @@
        description: sea-ice export - ice thickness
      #
      - standard_name: Si_floediam
-       canonical_units: m 
+       canonical_units: m
        description: sea-ice export - ice floe diameter
        #
      #-----------------------------------