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Fix/fengsha moist #253

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Sep 25, 2023
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Merged

Fix/fengsha moist #253

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3ddd39f
Merge pull request #228 from GEOS-ESM/develop
amdasilva May 12, 2023
cfab4fa
Merge pull request #237 from GEOS-ESM/develop
amdasilva May 18, 2023
6ea78fd
Merge pull request #242 from GEOS-ESM/develop
amdasilva May 30, 2023
f36a52c
fix for fengsha moist param and adds tuning knob
bbakernoaa Sep 15, 2023
3949a0c
updates for fengsha
bbakernoaa Sep 15, 2023
19ea414
Update CHANGELOG.md
bbakernoaa Sep 19, 2023
5c6e33c
Update CHANGELOG.md
mathomp4 Sep 19, 2023
ad037e3
Update DU2G_instance_DU.rc
bbakernoaa Sep 25, 2023
a4c4ef6
Update CHANGELOG.md
bbakernoaa Sep 25, 2023
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8 changes: 8 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -9,10 +9,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

### Fixed

- Corrected the units of the gravimetric soil moisture to percent instead of fractional in the FENGSHA dust scheme.

### Added

- Additional tuning parameters for the soil moisture and drylimit calculations for application specific tuning.

### Changed

- Correct soil moisture parameterization in FENGSHA
- Add `soil_moisture_factor` to the DU2G_instance_DU.rc (same name used in the K14 scheme) and DU2G_GridCompMod.F90 files for FENGSHA
- Add `soil_drylimit_factor` to the DU2G_instance_DU.rc and DU2G_GridCompMod.F90 files for FENGSHA

## [v2.2.1] - 2023-05-30

### Fixed
Expand Down
7 changes: 6 additions & 1 deletion ESMF/GOCART2G_GridComp/DU2G_GridComp/DU2G_GridCompMod.F90
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Expand Up @@ -59,6 +59,7 @@ module DU2G_GridCompMod
real :: alpha ! FENGSHA scaling factor
real :: gamma ! FENGSHA tuning exponent
real :: kvhmax ! FENGSHA max. vertical/horizontal mass flux ratio [1]
real :: f_sdl ! FENGSHA drylimit tuning factor
real :: Ch_DU_res(NHRES) ! resolutions used for Ch_DU
real :: Ch_DU ! dust emission tuning coefficient [kg s2 m-5].
logical :: maringFlag=.false. ! maring settling velocity correction
Expand Down Expand Up @@ -183,6 +184,8 @@ subroutine SetServices (GC, RC)
case ('fengsha')
call ESMF_ConfigGetAttribute (cfg, self%alpha, label='alpha:', __RC__)
call ESMF_ConfigGetAttribute (cfg, self%gamma, label='gamma:', __RC__)
call ESMF_ConfigGetAttribute (cfg, self%f_swc, label='soil_moisture_factor:', __RC__)
call ESMF_ConfigGetAttribute (cfg, self%f_sdl, label='soil_drylimit_factor:', __RC__)
call ESMF_ConfigGetAttribute (cfg, self%kvhmax, label='vertical_to_horizontal_flux_ratio_limit:', __RC__)
case ('k14')
call ESMF_ConfigGetAttribute (cfg, self%clayFlag, label='clayFlag:', __RC__)
Expand Down Expand Up @@ -794,10 +797,12 @@ subroutine Run1 (GC, import, export, clock, RC)
if (associated(DU_EROD)) DU_EROD = f_erod_

case ('fengsha')

call DustEmissionFENGSHA (frlake, frsnow, lwi, slc, du_clay, du_sand, du_silt, &
du_ssm, du_rdrag, airdens(:,:,self%km), ustar, du_uthres, &
self%alpha, self%gamma, self%kvhmax, MAPL_GRAV, &
self%rhop, self%sdist, emissions_surface, __RC__)
self%rhop, self%sdist, self%f_sdl, self%f_swc, emissions_surface, __RC__)

case ('ginoux')

call DustEmissionGOCART2G(self%radius*1.e-6, frlake, wet1, lwi, u10m, v10m, &
Expand Down
2 changes: 2 additions & 0 deletions ESMF/GOCART2G_GridComp/DU2G_GridComp/DU2G_instance_DU.rc
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Expand Up @@ -63,3 +63,5 @@ pressure_lid_in_hPa: 0.01
alpha: 0.3
gamma: 1.3
vertical_to_horizontal_flux_ratio_limit: 2.e-04
soil_drylimit_factor: 1.0
# soil_moisture_factor: 1.0
54 changes: 28 additions & 26 deletions Process_Library/GOCART2G_Process.F90
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Expand Up @@ -178,15 +178,14 @@ end subroutine DustAerosolDistributionKok
! !IROUTINE: soilMoistureConvertVol2Grav - volumetric to gravimetric soil moisture
!
! !INTERFACE:
real function soilMoistureConvertVol2Grav(vsoil, sandfrac, rhop)
real function soilMoistureConvertVol2Grav(vsoil, sandfrac)

! !USES:
implicit NONE

! !INPUT PARAMETERS:
real, intent(in) :: vsoil ! volumetric soil moisture fraction [1]
real, intent(in) :: sandfrac ! fractional sand content [1]
real, intent(in) :: rhop ! dry dust density [kg m-3]

! !DESCRIPTION: Convert soil moisture fraction from volumetric to gravimetric.
!
Expand All @@ -200,16 +199,16 @@ real function soilMoistureConvertVol2Grav(vsoil, sandfrac, rhop)

! !CONSTANTS:
real, parameter :: rhow = 1000. ! density of water [kg m-3]

real, parameter :: rhop = 1700.
!EOP
!-------------------------------------------------------------------------
! Begin...

! Saturated volumetric water content (sand-dependent) ! [m3 m-3]
vsat = 0.489 - 0.00126 * ( 100. * sandfrac )
vsat = 0.489 - 0.126 * sandfrac

! Gravimetric soil content
soilMoistureConvertVol2Grav = vsoil * rhow / (rhop * (1. - vsat))
soilMoistureConvertVol2Grav = 100. * vsoil * rhow / (rhop * (1. - vsat))

end function soilMoistureConvertVol2Grav

Expand All @@ -219,7 +218,7 @@ end function soilMoistureConvertVol2Grav
! !IROUTINE: moistureCorrectionFecan - Correction factor for Fecan soil moisture
!
! !INTERFACE:
real function moistureCorrectionFecan(slc, sand, clay, rhop)
real function moistureCorrectionFecan(slc, sand, clay, b)

! !USES:
implicit NONE
Expand All @@ -228,7 +227,7 @@ real function moistureCorrectionFecan(slc, sand, clay, rhop)
real, intent(in) :: slc ! liquid water content of top soil layer, volumetric fraction [1]
real, intent(in) :: sand ! fractional sand content [1]
real, intent(in) :: clay ! fractional clay content [1]
real, intent(in) :: rhop ! dry dust density [kg m-3]
real, intent(in) :: b ! drylimit factor from zender 2003

! !DESCRIPTION: Compute correction factor to account for Fecal soil moisture
!
Expand All @@ -246,10 +245,10 @@ real function moistureCorrectionFecan(slc, sand, clay, rhop)
! Begin...

! Convert soil moisture from volumetric to gravimetric
grvsoilm = soilMoistureConvertVol2Grav(slc, sand, rhop)
grvsoilm = soilMoistureConvertVol2Grav(slc, sand)

! Compute fecan dry limit
drylimit = clay * (14.0 * clay + 17.0)
drylimit = b * clay * (14.0 * clay + 17.0)

! Compute soil moisture correction
moistureCorrectionFecan = sqrt(1.0 + 1.21 * max(0., grvsoilm - drylimit)**0.68)
Expand Down Expand Up @@ -303,7 +302,7 @@ end function DustFluxV2HRatioMB95
! !INTERFACE:
subroutine DustEmissionFENGSHA(fraclake, fracsnow, oro, slc, clay, sand, silt, &
ssm, rdrag, airdens, ustar, uthrs, alpha, gamma, &
kvhmax, grav, rhop, distribution, emissions, rc)
kvhmax, grav, rhop, distribution, drylimit_factor, moist_correct, emissions, rc)

! !USES:
implicit NONE
Expand All @@ -327,7 +326,8 @@ subroutine DustEmissionFENGSHA(fraclake, fracsnow, oro, slc, clay, sand, silt,
real, intent(in) :: grav ! gravity [m/sec^2]
real, dimension(:), intent(in) :: rhop ! soil class density [kg/m^3]
real, dimension(:), intent(in) :: distribution ! normalized dust binned distribution [1]

real, intent(in) :: drylimit_factor ! drylimit tuning factor from zender2003
real, intent(in) :: moist_correct ! moisture correction factor
! !OUTPUT PARAMETERS:
real, intent(out) :: emissions(:,:,:) ! binned surface emissions [kg/(m^2 sec)]
integer, intent(out) :: rc ! Error return code: __SUCCESS__ or __FAIL__
Expand All @@ -352,6 +352,7 @@ subroutine DustEmissionFENGSHA(fraclake, fracsnow, oro, slc, clay, sand, silt,
real :: rustar
real :: total_emissions
real :: u_sum, u_thresh
real :: smois

! !CONSTANTS:
real, parameter :: ssm_thresh = 1.e-02 ! emit above this erodibility threshold [1]
Expand Down Expand Up @@ -405,24 +406,25 @@ subroutine DustEmissionFENGSHA(fraclake, fracsnow, oro, slc, clay, sand, silt,
! Compute threshold wind friction velocity using drag partition
! -------------------------------------------------------------
rustar = rdrag(i,j) * ustar(i,j)


! Fecan moisture correction
! -------------------------
smois = slc(i,j) * moist_correct
h = moistureCorrectionFecan(smois, sand(i,j), clay(i,j), drylimit_factor)

! Adjust threshold
! ----------------
u_thresh = uthrs(i,j) * h

u_sum = rustar + u_thresh

! Compute Horizontal Saltation Flux according to Eq (9) in Webb et al. (2020)
! ---------------------------------------------------------------------------
q = max(0., rustar - u_thresh) * u_sum * u_sum

! Now compute size-dependent total emission flux
! ----------------------------------------------
do n = 1, nbins
! Fecan moisture correction
! -------------------------
h = moistureCorrectionFecan(slc(i,j), sand(i,j), clay(i,j), rhop(n))

! Adjust threshold
! ----------------
u_thresh = uthrs(i,j) * h

u_sum = rustar + u_thresh

! Compute Horizontal Saltation Flux according to Eq (9) in Webb et al. (2020)
! ---------------------------------------------------------------------------
q = max(0., rustar - u_thresh) * u_sum * u_sum

! Distribute emissions to bins and convert to mass flux (kg s-1)
! --------------------------------------------------------------
emissions(i,j,n) = distribution(n) * total_emissions * q
Expand Down
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