Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Update parameters used for snow cover fraction scheme #48

Merged
merged 1 commit into from
Jun 18, 2024
Merged

Update parameters used for snow cover fraction scheme #48

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 2 additions & 1 deletion gsmphys/module_sf_noahmplsm.f90
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,7 @@ module module_sf_noahmplsm
real (kind=kind_phys) :: den !tree density (no. of trunks per m2)
real (kind=kind_phys) :: rc !tree crown radius (m)
real (kind=kind_phys) :: mfsno !snowmelt m parameter ()
real (kind=kind_phys) :: scffac !snow cover factor (m)
real (kind=kind_phys) :: saim(12) !monthly stem area index, one-sided
real (kind=kind_phys) :: laim(12) !monthly leaf area index, one-sided
real (kind=kind_phys) :: sla !single-side leaf area per kg [m2/kg]
Expand Down Expand Up @@ -1657,7 +1658,7 @@ subroutine energy (parameters,ice ,vegtyp ,ist ,nsnow ,nsoil , & !in
if(snowh.gt.0.) then
bdsno = sneqv / snowh
fmelt = (bdsno/100.)**parameters%mfsno
fsno = tanh( snowh /(2.5* z0 * fmelt))
fsno = tanh( snowh /(parameters%scffac * fmelt))
! print*,'bdsno=',bdsno,sneqv,snowh,parameters%mfsno,fmelt,fsno
endif

Expand Down
17 changes: 13 additions & 4 deletions gsmphys/noahmp_tables.f90
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -88,11 +88,20 @@ module noahmp_tables
& 0.30, 0.30, 0.00, 0.00, 0.00, 0.00, &
& 0.00, 0.00, 0.00, 0.00, 0.00, 0.00 /

! C. He 12/17/2020: optimized MFSNO values dependent on land type based on evaluation with SNOTEL SWE and MODIS SCF, surface albedo
real (kind=kind_phys) :: mfsno_table(mvt) !snowmelt curve parameter ()
data ( mfsno_table(i),i=1,mvt) / 2.50, 2.50, 2.50, 2.50, 2.50, 2.50, &
& 2.50, 2.50, 2.50, 2.50, 2.50, 2.50, &
& 2.50, 2.50, 2.50, 2.50, 2.50, 2.50, &
& 2.50, 2.50, 0.00, 0.00, 0.00, 0.00, &
data ( mfsno_table(i),i=1,mvt) / 1.00, 1.00, 1.00, 1.00, 1.00, 2.00, &
& 2.00, 2.00, 2.00, 2.00, 3.00, 3.00, &
& 4.00, 4.00, 2.50, 3.00, 3.00, 3.50, &
& 3.50, 3.50, 0.00, 0.00, 0.00, 0.00, &
& 0.00, 0.00, 0.00, 0.00, 0.00, 0.00 /

! C. He 12/17/2020: optimized snow cover factor (m) in SCF formulation to replace original constant 2.5*z0,z0=0.002m, based on evaluation with SNOTEL SWE and MODIS SCF, surface albedo
real (kind=kind_phys) :: scffac_table(mvt) !snow cover factor (m)
data ( scffac_table(i),i=1,mvt) / 0.005, 0.005, 0.005, 0.005, 0.005, 0.008, &
& 0.008, 0.010, 0.010, 0.010, 0.010, 0.007, &
& 0.021, 0.013, 0.015, 0.008, 0.015, 0.015, &
& 0.015, 0.015, 0.00, 0.00, 0.00, 0.00, &
& 0.00, 0.00, 0.00, 0.00, 0.00, 0.00 /

!
Expand Down
1 change: 1 addition & 0 deletions gsmphys/sfc_noahmp_drv.f
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -963,6 +963,7 @@ subroutine transfer_mp_parameters (vegtype,soiltype,slopetype, &
parameters%den = den_table(vegtype) !tree density (no. of trunks per m2)
parameters%rc = rc_table(vegtype) !tree crown radius (m)
parameters%mfsno = mfsno_table(vegtype) !snowmelt m parameter ()
parameters%scffac = scffac_table(vegtype) !snow cover factor (m)
parameters%saim = saim_table(vegtype,:) !monthly stem area index, one-sided
parameters%laim = laim_table(vegtype,:) !monthly leaf area index, one-sided
parameters%sla = sla_table(vegtype) !single-side leaf area per kg [m2/kg]
Expand Down