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Namelist option for time axis position. #839

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merged 5 commits into from
Jul 7, 2023
+51 −10
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Namelist option for time axis position. #839

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2efc26c
Add option to change location in interval of time axis
dabail10 Jun 20, 2023
befc255
Only use hist_time_axis when hist_avg is true
dabail10 Jun 21, 2023
8e30396
Add more comments and information in the documentation
dabail10 Jun 22, 2023
af0c7e8
Add a check on hist_time_axis as well as a global attribute
dabail10 Jun 22, 2023
d4b144b
Abort if hist_time_axis is not set correctly.
dabail10 Jun 23, 2023
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2 changes: 2 additions & 0 deletions cicecore/cicedyn/analysis/ice_history_shared.F90
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Expand Up @@ -132,6 +132,8 @@ module ice_history_shared
time_end(max_nstrm), &
time_bounds(2)

character (len=char_len), public :: hist_time_axis

real (kind=dbl_kind), allocatable, public :: &
a2D (:,:,:,:) , & ! field accumulations/averages, 2D
a3Dz(:,:,:,:,:) , & ! field accumulations/averages, 3D vertical
Expand Down
11 changes: 10 additions & 1 deletion cicecore/cicedyn/general/ice_init.F90
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Expand Up @@ -81,7 +81,7 @@ subroutine input_data
runid, runtype, use_restart_time, restart_format, lcdf64
use ice_history_shared, only: hist_avg, history_dir, history_file, &
incond_dir, incond_file, version_name, &
history_precision, history_format
history_precision, history_format, hist_time_axis
use ice_flux, only: update_ocn_f, l_mpond_fresh
use ice_flux, only: default_season
use ice_flux_bgc, only: cpl_bgc
Expand Down Expand Up @@ -185,6 +185,7 @@ subroutine input_data
restart_ext, use_restart_time, restart_format, lcdf64, &
pointer_file, dumpfreq, dumpfreq_n, dump_last, &
diagfreq, diag_type, diag_file, history_format,&
hist_time_axis, &
print_global, print_points, latpnt, lonpnt, &
debug_forcing, histfreq, histfreq_n, hist_avg, &
history_dir, history_file, history_precision, cpl_bgc, &
Expand Down Expand Up @@ -324,6 +325,8 @@ subroutine input_data
histfreq_base = 'zero' ! output frequency reference date
hist_avg(:) = .true. ! if true, write time-averages (not snapshots)
history_format = 'default' ! history file format
hist_time_axis = 'end' ! History file time axis averaging interval position

history_dir = './' ! write to executable dir for default
history_file = 'iceh' ! history file name prefix
history_precision = 4 ! precision of history files
Expand Down Expand Up @@ -906,6 +909,7 @@ subroutine input_data
call broadcast_scalar(history_file, master_task)
call broadcast_scalar(history_precision, master_task)
call broadcast_scalar(history_format, master_task)
call broadcast_scalar(hist_time_axis, master_task)
call broadcast_scalar(write_ic, master_task)
call broadcast_scalar(cpl_bgc, master_task)
call broadcast_scalar(incond_dir, master_task)
Expand Down Expand Up @@ -1570,6 +1574,10 @@ subroutine input_data
abort_list = trim(abort_list)//":24"
endif

if(trim(hist_time_axis) /= 'begin' .and. trim(hist_time_axis) /= 'middle' .and. trim(hist_time_axis) /= 'end') then
write (nu_diag,*) subname//' WARNING: hist_time_axis set to default end '
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@apcraig apcraig Jun 22, 2023 •
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I would abort here. Change to something like

         write (nu_diag,*) subname//' ERROR: hist_time_axis value not valid = '//trim(hist_time_axis)
         abort_list = trim(abort_list)//":24"

Instead of 24, give it a unique number, can quickly grep for abort_list to find one.

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Ok. I've added this.

endif

if(dumpfreq_base /= 'init' .and. dumpfreq_base /= 'zero') then
write (nu_diag,*) subname//' ERROR: bad value for dumpfreq_base, allowed values: init, zero'
abort_list = trim(abort_list)//":25"
Expand Down Expand Up @@ -2316,6 +2324,7 @@ subroutine input_data
write(nu_diag,1031) ' history_file = ', trim(history_file)
write(nu_diag,1021) ' history_precision= ', history_precision
write(nu_diag,1031) ' history_format = ', trim(history_format)
write(nu_diag,1031) ' hist_time_axis = ', trim(hist_time_axis)
if (write_ic) then
write(nu_diag,1039) ' Initial condition will be written in ', &
trim(incond_dir)
Expand Down
21 changes: 17 additions & 4 deletions cicecore/cicedyn/infrastructure/io/io_netcdf/ice_history_write.F90
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Expand Up @@ -21,7 +21,7 @@

module ice_history_write

use ice_constants, only: c0, c360, spval, spval_dbl
use ice_constants, only: c0, c360, p5, spval, spval_dbl
use ice_fileunits, only: nu_diag
use ice_exit, only: abort_ice
use icepack_intfc, only: icepack_warnings_flush, icepack_warnings_aborted
Expand Down Expand Up @@ -137,8 +137,6 @@ subroutine ice_write_hist (ns)

if (my_task == master_task) then

ltime2 = timesecs/secday

call construct_filename(ncfile(ns),'nc',ns)

! add local directory path name to ncfile
Expand Down Expand Up @@ -718,6 +716,12 @@ subroutine ice_write_hist (ns)
'ERROR: global attribute time_period_freq')
endif

if (hist_avg(ns)) then
status = nf90_put_att(ncid,nf90_global,'time_axis_position',trim(hist_time_axis))
if (status /= nf90_noerr) call abort_ice(subname// &
'ERROR: global attribute time axis position')
endif

title = 'CF-1.0'
status = &
nf90_put_att(ncid,nf90_global,'conventions',title)
Expand Down Expand Up @@ -749,7 +753,16 @@ subroutine ice_write_hist (ns)
!-----------------------------------------------------------------
! write time variable
!-----------------------------------------------------------------


ltime2 = timesecs/secday ! hist_time_axis = 'end' (default)

! Some coupled models require the time axis "stamp" to be in the middle
! or even beginning of averaging interval.
if (hist_avg(ns)) then
if (trim(hist_time_axis) == "begin" ) ltime2 = time_beg(ns)
if (trim(hist_time_axis) == "middle") ltime2 = p5*(time_beg(ns)+time_end(ns))
endif

status = nf90_inq_varid(ncid,'time',varid)
if (status /= nf90_noerr) call abort_ice(subname// &
'ERROR: getting time varid')
Expand Down
16 changes: 13 additions & 3 deletions cicecore/cicedyn/infrastructure/io/io_pio2/ice_history_write.F90
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Expand Up @@ -18,7 +18,7 @@
module ice_history_write

use ice_kinds_mod
use ice_constants, only: c0, c360, spval, spval_dbl
use ice_constants, only: c0, c360, p5, spval, spval_dbl
use ice_fileunits, only: nu_diag
use ice_exit, only: abort_ice
use icepack_intfc, only: icepack_warnings_flush, icepack_warnings_aborted
Expand Down Expand Up @@ -185,8 +185,6 @@ subroutine ice_write_hist (ns)
call ice_pio_initdecomp(ndim3=nzslyr, ndim4=ncat_hist, iodesc=iodesc4ds, precision=history_precision)
call ice_pio_initdecomp(ndim3=nfsd_hist, ndim4=ncat_hist, iodesc=iodesc4df, precision=history_precision)

ltime2 = timesecs/secday

! option of turning on double precision history files
lprecision = pio_real
if (history_precision == 8) lprecision = pio_double
Expand Down Expand Up @@ -678,6 +676,9 @@ subroutine ice_write_hist (ns)
status = pio_put_att(File,pio_global,'time_period_freq',trim(time_period_freq))
endif

if (hist_avg(ns)) &
status = pio_put_att(File,pio_global,'time_axis_position',trim(hist_time_axis))

title = 'CF-1.0'
status = &
pio_put_att(File,pio_global,'conventions',trim(title))
Expand Down Expand Up @@ -706,6 +707,15 @@ subroutine ice_write_hist (ns)
! write time variable
!-----------------------------------------------------------------

ltime2 = timesecs/secday ! hist_time_axis = 'end' (default)

! Some coupled models require the time axis "stamp" to be in the middle
! or even beginning of averaging interval.
if (hist_avg(ns)) then
if (trim(hist_time_axis) == "begin" ) ltime2 = time_beg(ns)
if (trim(hist_time_axis) == "middle") ltime2 = p5*(time_beg(ns)+time_end(ns))
endif

status = pio_inq_varid(File,'time',varid)
status = pio_put_var(File,varid,(/1/),ltime2)

Expand Down
1 change: 1 addition & 0 deletions configuration/scripts/ice_in
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Expand Up @@ -53,6 +53,7 @@
history_file = 'iceh'
history_precision = 4
history_format = 'default'
hist_time_axis = 'end'
write_ic = .true.
incond_dir = './history/'
incond_file = 'iceh_ic'
Expand Down
1 change: 1 addition & 0 deletions doc/source/cice_index.rst
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Expand Up @@ -322,6 +322,7 @@ either Celsius or Kelvin units). Deprecated parameters are listed at the end.
"history_file", "history output file prefix", ""
"history_format", "history file format", ""
"history_precision", "history output precision: 4 or 8 byte", "4"
"hist_time_axis", "history file time axis interval location: begin, middle, end", "end"
"hm", "land/boundary mask, thickness (T-cell)", ""
"hmix", "ocean mixed layer depth", "20. m"
"hour", "hour of the year", ""
Expand Down
1 change: 1 addition & 0 deletions doc/source/user_guide/ug_case_settings.rst
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Expand Up @@ -191,6 +191,7 @@ setup_nml
"``history_format``", "``default``", "read/write history files in default format", "``default``"
"", "``pio_pnetcdf``", "read/write restart files with pnetcdf in pio", ""
"``history_precision``", "integer", "history file precision: 4 or 8 byte", "4"
"``hist_time_axis``","character","history file time axis interval location: begin, middle, end","end"
"``ice_ic``", "``default``", "equal to internal", "``default``"
"", "``internal``", "initial conditions set based on ice\_data\_type,conc,dist inputs", ""
"", "``none``", "no ice", ""
Expand Down
7 changes: 5 additions & 2 deletions doc/source/user_guide/ug_implementation.rst
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Expand Up @@ -1197,8 +1197,11 @@ with a given ``histfreq`` value, or if an element of ``histfreq_n`` is 0, then
no file will be written at that frequency. The output period can be
discerned from the filenames. All history streams will be either instantaneous
or averaged as specified by the ``hist_avg`` namelist setting and the frequency
will be relative to a reference date specified by ``histfreq_base``. More
information about how the frequency is computed is found in :ref:`timemanager`.
will be relative to a reference date specified by ``histfreq_base``. Also, some
Earth Sytem Models require the history file time axis to be centered in the averaging
interval. The flag ``hist_time_axis`` will allow the user to chose ``begin``, ``middle``,
or ``end`` for the time stamp. More information about how the frequency is
computed is found in :ref:`timemanager`.

For example, in the namelist:

Expand Down