add a physics scheme into wrf model
DESCRIPTION
Add a Physics Scheme into WRF Model. Shu-hua Chen UC Davis/AFWA. Physics implementation features Adding a physics scheme. Three Sets of Dimensions. Domain size: ids, ide, jds, jde, kds, kde Memory size: ims, ime, jms, jme, kms, kme Tile size: its, ite, jts, jte, kts, kte. - PowerPoint PPT PresentationTRANSCRIPT
Add a Physics Scheme
into WRF Model
Shu-hua ChenUC Davis/AFWA
Physics implementation features
Adding a physics scheme
Domain size: ids, ide, jds, jde, kds, kde
Memory size: ims, ime, jms, jme, kms, kme
Tile size: its, ite, jts, jte, kts, kte
Three Sets of Dimensions
Rules for WRF Physics
Naming rules
xxx = individual scheme
ex, module_cu_kf.F
Naming Rules
module_yy_xxx.F (module)
yy = ra is for radiation bl is for PBL cu is for cumulus mp is for microphysics.
YY = ra is for radiation bl is for PBL cu is for cumulus
Naming Rules
RXXYYTEN (tendencies)
XX = variable (th, u, v, qv, qc, … )
ex, RTHBLTEN
Coding rules (later)
Rules for WRF Physics
Naming rules
One scheme one module
WRF Physics Features
REAL , PARAMETER :: r_d = 287. REAL , PARAMETER :: r_v = 461.6 REAL , PARAMETER :: cp = 7.*r_d/2. REAL , PARAMETER :: cv = cp-r_d . .
• Unified global constatnts
(module_model_constants.F)
• Unified global constatnts
(module_model_constants.F)
• Vertical index
(kms is at the bottom)
• Unified common calculations
(saturation mixing ratio)
WRF Physics Features
WRF Language
• 4D Moisture field, moist(i,k,j,?)
? = P_QV (water vapor) P_QC (cloud water)
P_QI (cloud ice)
P_QR (rain)
P_QS (snow)
P_QG (graupel)
(module_state_description.F)
WRF Language
• 4D Moisture field, moist(i,k,j,?)
• PARAM_FIRST_SCALAR
IF ( P_QI .ge. PARAM_FIRST_SCALAR ) (the memory of cloud ice is allocated) . . .
Prepare your code
Create a new module
Declare new variables and a new package in Registry
Modify solve_em.F (solve_eh.F)
Implement a new physics scheme
Do initialization
Modify namelist
Modify phy_prep (module_em.F)
Modify physics_drive.int
Modify cumulus_driver.F
Modify Makefile
Compile and test
Modify calculate_phy_ten (module_em.F)
Implement a new physics scheme
Modify phy_cu_ten (module_physics_addtendc.F)
a) Replace continuation characters in the 6th column with f90 continuation `&‘ at end of previous line
1.F90
Prepare your code
Subroutine kessler(QV, T,& its,ite,jts,jte,kts,kte,& ims,ime,jms,jme,kms,kme,& ids,ide,jds,jde,kds,kde)
F77
Subroutine kessler(QV, T, . . . & its,ite,jts,jte,kts,kte,& ims,ime,jms,jme,kms,kme,& ids,ide,jds,jde,kds,kde )
F90
a) Replace continuation characters in the 6th column with f90 continuation `&‘ at end of previous line
1.F90
b)Replace the 1st column `C` for comment with `!`
Prepare your code
c This is a test
F77
! This is a test
F90
1.F90
2.No common block
common/var1/T,q,p, …
F77
Subroutine sub(T,q,p, ….) real,intent(out), & dimension(ims:ime,kms:kme,jms:jme):: T,q,p
F90
Prepare your code
1.F90
2.No common block
3.Use “ implicit none ”
4.Use “ intent ”
Prepare your code
Subroutine sub(T,q,p, ….) real,intent(out), & dimension(ims:ime,kms:kme,jms:jme):: T
real,intent( in), & dimension(ims:ime,kms:kme,jms:jme):: q real,intent(inout), & dimension(ims:ime,kms:kme,jms:jme):: p
1.F90
2.No common block
3.Use “ implicit none ”
4.Use “ intent ”
5.Variable dimensions
Prepare your code
Subroutine sub(glo,….) real,intent(out), & dimension(ims:ime,kms:kme,jms:jme):: glo
real,dimension(its:ite,kts:kte,jts:jte):: loc
1.F90
2.No common block
3.Use “ implicit none ”
4.Use “ intent ”
5.Variable dimensions
6.Do loops
do j = jts, jte do k = kts, kte do i = its, ite ... enddo enddo enddo
Prepare your code
Implement a new physics scheme
Create a new module
ex, module_cu_chen.F (put all your codes in)
Go Registry and declare a new package (and new variables) (WRFV1/Registry)
package chenscheme cu_physics==3 - -
package kfscheme cu_physics==1 - -
package bmjscheme cu_physics==2 - -
Implement a new physics scheme
Cloud microphysics
package kesslerscheme mp_physics==1 - moist:qv,qc,qr
package linscheme mp_physics==2 - moist:qv,qc,qr,qi,qs,qg
package ncepcloud3 mp_physics==3 - moist:qv,qc,qr
package ncepcloud5 mp_physics==4 - moist:qv,qc,
Create a new module
ex, module_cu_chen.F (put all your codes in)
Go Registry and declare a new package (and new variables) (WRFV1/Registry)
Implement a new physics scheme
Modify namelist.input and assign
cu_physics = 3
Create a new module
ex, module_cu_chen.F (put all your codes in)
Go Registry and declare a new package (and new variables) (WRFV1/Registry)
INIT
WRF ……. solve_em
phy_initstart_domain_em cu_init
(dyn_em)(start_em.F)
*
*
(phys)(module_physics_init.F)
(dyn_em)
phys/module_physics_init.F
Pass new variables down to cu_init
INIT
WRF ……. solve_em
phy_initstart_domain_em cu_init
(dyn_em)(start_em.F)
*
*
(phys)(module_physics_init.F)
(dyn_em)
phys/module_physics_init.F
Go subroutine cu_init Include the new module and create a new SELECT case
Pass new variables down to cu_init
cps_select: SELECT CASE(config_flags%cu_physics) CASE (KFSCHEME) CALL kfinit(...) CASE (BMJSCHEME)
CALL bmjinit(...)
CASE DEFAULT END SELECT cps_select
Match the package name in Registry
Subroutine cu_init(…) . USE module_cu_kf USE module_cu_bmj
.
CASE (CHENSCHEME) CALL cheninit(...)
phys/module_physics_init.F
USE module_cu_chen
Put intomodule_cu_chen.F
WRF … solve_em
DYNAMICS
phy_init…
INIT
.
.
phy_prep
moist_physics_prep
phy_prep/moist_physics_prep
• Calculate required variables
• Convert variables from C grid
to A grid
WRF … solve_em
DYNAMICS
phy_init…
INIT
.
.
microphysics_driver
radiation_driver
cumulus_driver
pbl_driver
phy_prep
moist_physics_prep
chencps
Three-level structure
solve_em
Physics_driverSELECT CASE (CHOICE) CASE ( NOPHY ) CASE ( SCHEME1 ) CALL XXX CASE ( SCHEME2 ) CALL YYY CASE DEFAULTEND SELECT
Individual physics scheme ( XXX )
Go physics driver (cumulus_driver.F) Include the new module and create a new SELECT CASE in driver
Check available variables in drivers (variables are explained inside drivers)
cumulus_driver.F
Subroutine cumulus_driver . USE module_cu_kf USE module_bmj_kf
.
cumulus_driver.F
USE module_cu_chen cps_select: SELECT CASE(config_flags%cu_physics) CASE (KFSCHEME) CALL KFCPS(...) CASE (BMJSCHEME) CALL BMJCPS(...)
CASE DEFAULTEND SELECT cps_select
Match the package name in Registry
Put inmodule_cu_chen.F
CASE (CHENSCHEME) CALL CHENCPS(...)
SUBROUTINE cumulus_driver(arg1, arg2, … & newvar1, newvar2,… & its,ite,jts,jte,kts,kte, & ims,ime,jms,jme,kms,kme, & ids,ide,jds,jde,kds,kde )
INTEGER, INTENT(IN) :: its,ite,jts,jte,kts,kte, & ims,ime,jms,jme,kms,kme, & ids,ide,jds,jde,kds,kde REAL, INTENT(IN) :: arg1, arg2
REAL, INTENT(OUT), DIMENSION(kms:kme) :: & newvar1,newvar2,….
Physics_drive.int
solve_em
cumulus_driver chencps
phy_prep
DYNAMICS
.
calculate_phy_tend
update_phy_ten phy_cu_ten
Might need to call MPP
. CASE(BMJSCHEME) . CASE (CHENSCHEME) CALL add_a2a (rt_tendf, RTHCUTEN,… ) CALL add_a2c_u(ru_tendf,RUBLTEN,… ) CALL add_a2c_v(rv_tendf,RVBLTEN,… ) if (P_QS .ge. PARAM_FIRST_SCALAR) & CALL add_a2a(moist_tendf(ims,kms,jms,P_QS),RQSCUTEN, .. & ids,ide, jds, jde, kds, kde, & ims, ime, jms, jme, kms, kme, & its, ite, jts, jte, kts, kte ) .
phys/module_physics_addtendc.F
Subroutine phy_cu_ten (… )
MODULE_CU_CHEN
CONTRAINS!--------------------------------------------------------------------------SUBROUTINE cheninit (arg1, arg2, … ).ENDSUBROUTINE cheninit
SUBROUTINE chencps (arg3, arg4, … ).END SUBROUTINE chencps .
END MODULE_CU_CHEN
module_cu_chen.F