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Create mushy macroscale drainage timescale parameter #462

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Sep 30, 2023
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Create mushy macroscale drainage timescale parameter #462

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2 changes: 1 addition & 1 deletion columnphysics/icepack_itd.F90
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Expand Up @@ -1483,7 +1483,7 @@ subroutine zap_snow_temperature(dt, ncat, &
real (kind=dbl_kind) :: &
rnslyr , & ! real(nslyr)
hsn , & ! snow thickness (m)
zqsn , & ! snow layer enthalpy (J m-2)
zqsn , & ! snow layer enthalpy (J m-3)
zTsn , & ! snow layer temperature (C)
Tmax ! maximum allowed snow temperature

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13 changes: 10 additions & 3 deletions columnphysics/icepack_parameters.F90
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Expand Up @@ -111,6 +111,7 @@ module icepack_parameters
! freshwater value needed for enthalpy
depressT = 0.054_dbl_kind ,&! Tf:brine salinity ratio (C/ppt)
viscosity_dyn = 1.79e-3_dbl_kind, & ! dynamic viscosity of brine (kg/m/s)
tscale_pnd_drain = c10 ,&! mushy macroscopic drainage timescale (days)
Tocnfrz = -1.8_dbl_kind ,&! freezing temp of seawater (C),
! used as Tsfcn for open water
Tffresh = 273.15_dbl_kind ,&! freezing temp of fresh ice (K)
Expand Down Expand Up @@ -319,7 +320,7 @@ module icepack_parameters
frzpnd = 'cesm' ! pond refreezing parameterization

real (kind=dbl_kind), public :: &
dpscale = c1, & ! alter e-folding time scale for flushing
dpscale = 0.001_dbl_kind,& ! alter e-folding time scale for flushing (ktherm=1)
rfracmin = 0.15_dbl_kind, & ! minimum retained fraction of meltwater
rfracmax = 0.85_dbl_kind, & ! maximum retained fraction of meltwater
pndaspect = 0.8_dbl_kind, & ! ratio of pond depth to area fraction
Expand Down Expand Up @@ -440,7 +441,7 @@ subroutine icepack_init_parameters( &
rhos_in, rhoi_in, rhow_in, cp_air_in, emissivity_in, &
cp_ice_in, cp_ocn_in, hfrazilmin_in, floediam_in, &
depressT_in, dragio_in, thickness_ocn_layer1_in, iceruf_ocn_in, &
albocn_in, gravit_in, viscosity_dyn_in, &
albocn_in, gravit_in, viscosity_dyn_in, tscale_pnd_drain_in, &
Tocnfrz_in, rhofresh_in, zvir_in, vonkar_in, cp_wv_in, &
stefan_boltzmann_in, ice_ref_salinity_in, &
Tffresh_in, Lsub_in, Lvap_in, Timelt_in, Tsmelt_in, &
Expand Down Expand Up @@ -522,6 +523,7 @@ subroutine icepack_init_parameters( &
cp_ocn_in, & ! specific heat of ocn (J/kg/K)
depressT_in, & ! Tf:brine salinity ratio (C/ppt)
viscosity_dyn_in, & ! dynamic viscosity of brine (kg/m/s)
tscale_pnd_drain_in,&! mushy macroscopic drainage timescale (days)
Tocnfrz_in, & ! freezing temp of seawater (C)
Tffresh_in, & ! freezing temp of fresh ice (K)
Lsub_in, & ! latent heat, sublimation freshwater (J/kg)
Expand Down Expand Up @@ -855,6 +857,7 @@ subroutine icepack_init_parameters( &
if (present(albocn_in) ) albocn = albocn_in
if (present(gravit_in) ) gravit = gravit_in
if (present(viscosity_dyn_in) ) viscosity_dyn = viscosity_dyn_in
if (present(tscale_pnd_drain_in) ) tscale_pnd_drain = tscale_pnd_drain_in
if (present(Tocnfrz_in) ) Tocnfrz = Tocnfrz_in
if (present(rhofresh_in) ) rhofresh = rhofresh_in
if (present(zvir_in) ) zvir = zvir_in
Expand Down Expand Up @@ -1152,7 +1155,8 @@ subroutine icepack_query_parameters( &
p333_out, p666_out, spval_const_out, pih_out, piq_out, pi2_out, &
rhos_out, rhoi_out, rhow_out, cp_air_out, emissivity_out, &
cp_ice_out, cp_ocn_out, hfrazilmin_out, floediam_out, &
depressT_out, dragio_out, thickness_ocn_layer1_out, iceruf_ocn_out, albocn_out, gravit_out, viscosity_dyn_out, &
depressT_out, dragio_out, thickness_ocn_layer1_out, iceruf_ocn_out, &
albocn_out, gravit_out, viscosity_dyn_out, tscale_pnd_drain_out, &
Tocnfrz_out, rhofresh_out, zvir_out, vonkar_out, cp_wv_out, &
stefan_boltzmann_out, ice_ref_salinity_out, &
Tffresh_out, Lsub_out, Lvap_out, Timelt_out, Tsmelt_out, &
Expand Down Expand Up @@ -1242,6 +1246,7 @@ subroutine icepack_query_parameters( &
cp_ocn_out, & ! specific heat of ocn (J/kg/K)
depressT_out, & ! Tf:brine salinity ratio (C/ppt)
viscosity_dyn_out, & ! dynamic viscosity of brine (kg/m/s)
tscale_pnd_drain_out, & ! mushy macroscopic drainage timescale (days)
Tocnfrz_out, & ! freezing temp of seawater (C)
Tffresh_out, & ! freezing temp of fresh ice (K)
Lsub_out, & ! latent heat, sublimation freshwater (J/kg)
Expand Down Expand Up @@ -1612,6 +1617,7 @@ subroutine icepack_query_parameters( &
if (present(albocn_out) ) albocn_out = albocn
if (present(gravit_out) ) gravit_out = gravit
if (present(viscosity_dyn_out) ) viscosity_dyn_out= viscosity_dyn
if (present(tscale_pnd_drain_out) ) tscale_pnd_drain_out = tscale_pnd_drain
if (present(Tocnfrz_out) ) Tocnfrz_out = Tocnfrz
if (present(rhofresh_out) ) rhofresh_out = rhofresh
if (present(zvir_out) ) zvir_out = zvir
Expand Down Expand Up @@ -1807,6 +1813,7 @@ subroutine icepack_write_parameters(iounit)
write(iounit,*) " albocn = ",albocn
write(iounit,*) " gravit = ",gravit
write(iounit,*) " viscosity_dyn = ",viscosity_dyn
write(iounit,*) " tscale_pnd_drain = ",tscale_pnd_drain
write(iounit,*) " Tocnfrz = ",Tocnfrz
write(iounit,*) " rhofresh = ",rhofresh
write(iounit,*) " zvir = ",zvir
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21 changes: 12 additions & 9 deletions columnphysics/icepack_therm_mushy.F90
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Expand Up @@ -7,7 +7,7 @@ module icepack_therm_mushy
use icepack_parameters, only: p01, p05, p1, p2, p5, pi, bignum, puny
use icepack_parameters, only: viscosity_dyn, rhow, rhoi, rhos, cp_ocn, cp_ice, Lfresh, gravit
use icepack_parameters, only: hs_min, snwgrain
use icepack_parameters, only: a_rapid_mode, Rac_rapid_mode
use icepack_parameters, only: a_rapid_mode, Rac_rapid_mode, tscale_pnd_drain
use icepack_parameters, only: aspect_rapid_mode, dSdt_slow_mode, phi_c_slow_mode
use icepack_parameters, only: sw_redist, sw_frac, sw_dtemp
use icepack_mushy_physics, only: icepack_mushy_density_brine, enthalpy_brine, enthalpy_snow
Expand Down Expand Up @@ -3167,9 +3167,11 @@ subroutine flush_pond(w, hpond, apond, dt)
hpond ! melt pond thickness (m)

real(kind=dbl_kind), parameter :: &
lambda_pond = c1 / (10.0_dbl_kind * 24.0_dbl_kind * 3600.0_dbl_kind), &
hpond0 = 0.01_dbl_kind

real(kind=dbl_kind) :: &
lambda_pond ! 1 / macroscopic drainage time scale (s)

character(len=*),parameter :: subname='(flush_pond)'

if (tr_pond) then
Expand All @@ -3181,6 +3183,7 @@ subroutine flush_pond(w, hpond, apond, dt)
hpond = max(hpond, c0)

! exponential decay of pond
lambda_pond = c1 / (tscale_pnd_drain * 24.0_dbl_kind * 3600.0_dbl_kind)
hpond = hpond - lambda_pond * dt * (hpond + hpond0)

hpond = max(hpond, c0)
Expand Down Expand Up @@ -3214,11 +3217,11 @@ subroutine flood_ice(hsn, hin, &
hsn , & ! snow thickness (m)
hin , & ! ice thickness (m)
sss , & ! sea surface salinity (ppt)
qocn ! ocean brine enthalpy (J m-2)
qocn ! ocean brine enthalpy (J m-3)

real(kind=dbl_kind), dimension(:), intent(inout) :: &
zqsn , & ! snow layer enthalpy (J m-2)
zqin , & ! ice layer enthalpy (J m-2)
zqsn , & ! snow layer enthalpy (J m-3)
zqin , & ! ice layer enthalpy (J m-3)
zSin , & ! ice layer bulk salinity (ppt)
phi , & ! ice liquid fraction
smice , & ! ice mass tracer in snow (kg/m^3)
Expand Down Expand Up @@ -3246,8 +3249,8 @@ subroutine flood_ice(hsn, hin, &
phi_snowice , & ! liquid fraction of new snow ice
rho_snowice , & ! density of snowice (kg m-3)
zSin_snowice , & ! bulk salinity of new snowice (ppt)
zqin_snowice , & ! ice enthalpy of new snowice (J m-2)
zqsn_snowice , & ! snow enthalpy of snow thats becoming snowice (J m-2)
zqin_snowice , & ! ice enthalpy of new snowice (J m-3)
zqsn_snowice , & ! snow enthalpy of snow that is becoming snowice (J m-3)
freeboard_density , & ! negative of ice surface freeboard times the ocean density (kg m-2)
ice_mass , & ! mass of the ice (kg m-2)
! snow_mass , & ! mass of the ice (kg m-2)
Expand Down Expand Up @@ -3384,10 +3387,10 @@ subroutine enthalpy_snow_snowice(nslyr, dh, hsn, zqsn, zqsn_snowice)
hsn ! initial snow thickness

real(kind=dbl_kind), dimension(:), intent(in) :: &
zqsn ! snow layer enthalpy (J m-2)
zqsn ! snow layer enthalpy (J m-3)

real(kind=dbl_kind), intent(out) :: &
zqsn_snowice ! enthalpy of snow becoming snowice (J m-2)
zqsn_snowice ! enthalpy of snow becoming snowice (J m-3)

real(kind=dbl_kind) :: &
rnlyr ! real value of number of snow layers turning to snowice
Expand Down
3 changes: 2 additions & 1 deletion doc/source/icepack_index.rst
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Expand Up @@ -121,7 +121,7 @@ either Celsius or Kelvin units). Deprecated parameters are listed at the end.
"divu_adv", "divergence associated with advection", "1/s"
"dms", "dimethyl sulfide concentration", "mmol/m\ :math:`^3`"
"dmsp", "dimethyl sulfoniopropionate concentration", "mmol/m\ :math:`^3`"
"dpscale", ":math:`\bullet` time scale for flushing in permeable ice", ":math:`1\times 10^{-3}`"
"dpscale", ":math:`\bullet` scaling factor for flushing in permeable ice (ktherm=1)", ":math:`1\times 10^{-3}`"
"dragio", "drag coefficient for water on ice", "0.00536"
"dSdt_slow_mode", ":math:`\bullet` drainage strength parameter", ""
"dsnow", "change in snow thickness", "m"
Expand Down Expand Up @@ -463,6 +463,7 @@ either Celsius or Kelvin units). Deprecated parameters are listed at the end.
"time", "total elapsed time", "s"
"time_forc", "time of last forcing update", "s"
"Timelt", "melting temperature of ice top surface", "0. C"
"tscale_pnd_drain", "mushy pond macroscopic drainage timescale", "10 days"
"TLAT", "latitude of cell center", "radians"
"TLON", "longitude of cell center", "radians"
"tmask", "land/boundary mask, thickness (T-cell)", ""
Expand Down
3 changes: 2 additions & 1 deletion doc/source/user_guide/ug_case_settings.rst
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Expand Up @@ -215,6 +215,7 @@ thermo_nml
"``phi_c_slow_mode``", ":math:`0<\phi_c < 1`", "critical liquid fraction", "0.05"
"``phi_i_mushy``", ":math:`0<\phi_i < 1`", "solid fraction at lower boundary", "0.85"
"``Rac_rapid_mode``", "real", "critical Rayleigh number", "10.0"
"``tscale_pnd_drain``", "real", "mushy pond macroscopic drainage timescale in days", "10."
"", "", "", ""


Expand Down Expand Up @@ -272,7 +273,7 @@ ponds_nml
:widths: 15, 15, 30, 15

"", "", "", ""
"``dpscale``", "real", "time scale for flushing in permeable ice", "1.0"
"``dpscale``", "real", "scaling factor for flushing in permeable ice (ktherm=1)", "1.e-3"
"``frzpnd``", "``cesm``", "CESM pond refreezing forumulation", "``cesm``"
"", "``hlid``", "Stefan refreezing with pond ice thickness", ""
"``hp1``", "real", "critical ice lid thickness for topo ponds in m", "0.01"
Expand Down
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