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Adds options for frazil coupling type "omega-fluxes" #43

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Adds options for frazil coupling type "omega-fluxes" #43

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e881697
Adds omega-fluxes option for frazil coupling in icepack
njeffery May 28, 2026
30b0620
Add a minimum salinity bounds for frazil
njeffery Jun 16, 2026
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64 changes: 52 additions & 12 deletions columnphysics/icepack_therm_itd.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -23,13 +23,13 @@ module icepack_therm_itd

use icepack_fsd, only: floe_rad_c, floe_binwidth

use icepack_parameters, only: c0, c1, c2, c3, c4, c6, c10
use icepack_parameters, only: c0, c1, c2, c3, c4, c6, c10, c1000
use icepack_parameters, only: p001, p1, p333, p5, p666, puny, bignum
use icepack_parameters, only: rhos, rhoi, Lfresh, ice_ref_salinity
use icepack_parameters, only: phi_init, dsin0_frazil
use icepack_parameters, only: Tliquidus_max
use icepack_parameters, only: rhosi, conserv_check, rhosmin, snwredist
use icepack_parameters, only: kitd, ktherm
use icepack_parameters, only: kitd, ktherm, min_salin
use icepack_parameters, only: z_tracers, hfrazilmin, hi_min
use icepack_parameters, only: cpl_frazil, update_ocn_f, saltflux_option
use icepack_parameters, only: icepack_chkoptargflag
Expand Down Expand Up @@ -1238,7 +1238,10 @@ subroutine add_new_ice (dt, &
wave_spectrum, &
wavefreq, &
d_afsd_latg, &
d_afsd_newi)
d_afsd_newi, &
frazilm, &
frazils, &
frazilh)

use icepack_fsd, only: fsd_lateral_growth, fsd_add_new_ice

Expand Down Expand Up @@ -1316,6 +1319,13 @@ subroutine add_new_ice (dt, &
d_afsd_latg , & ! due to fsd lateral growth
d_afsd_newi ! new ice formation

! explicit frazil fluxes

real (kind=dbl_kind), intent(in), optional :: &
frazilm , & ! frazil ice mass flux (kg/m2/s)
frazils , & ! frazil ice salt flux (kg/m2/s)
frazilh ! frazil ice enthalpy flux (+) (W/m2)

! local variables

integer (kind=int_kind) :: &
Expand Down Expand Up @@ -1457,16 +1467,28 @@ subroutine add_new_ice (dt, &
!-----------------------------------------------------------------

if (ktherm == 2) then ! mushy
if (sss > c2 * dSin0_frazil) then
Si0new = sss - dSin0_frazil
if (cpl_frazil == 'omega-fluxes') then
vi0new = frazilm * dt / rhoi
if (vi0new > puny) then
Si0new = max(c1000 * frazils / frazilm, min_salin)
qi0new = -frazilh / frazilm * rhoi
else
Si0new = sss
qi0new = c0
vi0new = c0
endif
else
Si0new = sss**2 / (c4*dSin0_frazil)
if (sss > c2 * dSin0_frazil) then
Si0new = sss - dSin0_frazil
else
Si0new = sss**2 / (c4*dSin0_frazil)
endif
Ti = min(liquidus_temperature_mush(Si0new/phi_init), Tliquidus_max)
qi0new = icepack_enthalpy_mush(Ti, Si0new)
endif
do k = 1, nilyr
Sprofile(k) = Si0new
enddo
Ti = min(liquidus_temperature_mush(Si0new/phi_init), Tliquidus_max)
qi0new = icepack_enthalpy_mush(Ti, Si0new)
else
do k = 1, nilyr
Sprofile(k) = salinz(k)
Expand All @@ -1479,7 +1501,7 @@ subroutine add_new_ice (dt, &
!-----------------------------------------------------------------

fnew = max (frzmlt, c0) ! fnew > 0 iff frzmlt > 0
vi0new = -fnew*dt / qi0new ! note sign convention, qi < 0
if (cpl_frazil .NE. 'omega-fluxes') vi0new = -fnew*dt / qi0new ! note sign convention, qi < 0
vi0_init = vi0new ! for bgc

! increment ice volume and energy
Expand All @@ -1504,7 +1526,7 @@ subroutine add_new_ice (dt, &

dfresh = c0
dfsalt = c0
if (cpl_frazil == 'external') then
if (cpl_frazil == 'external' .OR. cpl_frazil == 'omega-fluxes') then
! do nothing here, calculations are in the coupler or elsewhere
else
if (update_ocn_f) then
Expand Down Expand Up @@ -1894,7 +1916,8 @@ subroutine icepack_step_therm2(dt, hin_max, &
wavefreq, &
d_afsd_latg, d_afsd_newi, &
d_afsd_latm, d_afsd_weld, &
dpnd_melt)
dpnd_melt, frazilm, &
frazils, frazilh)

use icepack_parameters, only: icepack_init_parameters

Expand Down Expand Up @@ -1941,6 +1964,11 @@ subroutine icepack_step_therm2(dt, hin_max, &
real (kind=dbl_kind), intent(inout), optional :: &
dpnd_melt ! pond 'drainage' due to ice melting (m / step)

real (kind=dbl_kind), intent(in), optional :: &
frazilm , & ! frazil ice mass flux (kg/m^2/s)
frazils , & ! frazil ice salt flux (kg/m^2/s)
frazilh ! frazil ice enthalpy flux (+) (W/m^2)

real (kind=dbl_kind), intent(in), optional :: &
wlat ! lateral melt rate (m/s)

Expand Down Expand Up @@ -2031,6 +2059,16 @@ subroutine icepack_step_therm2(dt, hin_max, &
return
endif
endif
if (cpl_frazil == 'omega-fluxes') then
if (.not.(present(frazilm) .and. &
present(frazils) .and. &
present(frazilh))) then

call icepack_warnings_add(subname//' error in frazil arguments, cpl_frazil=omega-fluxes')
call icepack_warnings_setabort(.true.,__FILE__,__LINE__)
return
endif
endif
endif

!-----------------------------------------------------------------
Expand Down Expand Up @@ -2110,7 +2148,9 @@ subroutine icepack_step_therm2(dt, hin_max, &
H2_18O_ocn, &
wave_sig_ht, &
wave_spectrum, wavefreq, &
d_afsd_latg, d_afsd_newi)
d_afsd_latg, d_afsd_newi, &
frazilm, frazils, &
frazilh)

if (icepack_warnings_aborted(subname)) return

Expand Down
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