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Fixes momentum flux in gustiness parameter #1624

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Jul 12, 2017
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Fixes momentum flux in gustiness parameter #1624

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1669891
Fixes momentum flux in gustiness parameter
singhbalwinder Jul 10, 2017
2dfa6f1
Fixes a typo - mm/s to m/s
singhbalwinder Jul 10, 2017
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17 changes: 13 additions & 4 deletions cime/src/share/util/shr_flux_mod.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -189,6 +189,7 @@ SUBROUTINE shr_flux_atmOcn(nMax ,zbot ,ubot ,vbot ,thbot , prec_gust, gust_
!--- local variables --------------------------------
integer(IN) :: n ! vector loop index
real(R8) :: vmag ! surface wind magnitude (m/s)
real(R8) :: vmag_old ! surface wind magnitude without gustiness (m/s)
real(R8) :: thvbot ! virtual temperature (K)
real(R8) :: ssq ! sea surface humidity (kg/kg)
real(R8) :: delt ! potential T difference (K)
Expand Down Expand Up @@ -281,10 +282,18 @@ SUBROUTINE shr_flux_atmOcn(nMax ,zbot ,ubot ,vbot ,thbot , prec_gust, gust_
! old version
!vmag = max(umin, sqrt( (ubot(n)-us(n))**2 + (vbot(n)-vs(n))**2) )

!--- vmag+ugust (convective gustiness) Limit to a max precip 6 cm/day = 0.00069444 mm/s.
!--- vmag+ugust (convective gustiness) Limit to a max precip 6 cm/day = 0.00069444 m/s.
!--- reverts to original formula if gust_fac=0
vmag = max(umin, sqrt( (ubot(n)-us(n))**2 + (vbot(n)-vs(n))**2) + ugust(min(prec_gust(n),6.94444e-4_R8)))

!PMA saves vmag_old for taux tauy computation

vmag_old = max(umin, sqrt( (ubot(n)-us(n))**2 + (vbot(n)-vs(n))**2) )

if (gust_fac .gt. 1.e-12_R8) then
vmag = max(umin, sqrt( (ubot(n)-us(n))**2 + (vbot(n)-vs(n))**2) + ugust(min(prec_gust(n),6.94444e-4_R8)))
else
vmag = vmag_old
endif

thvbot = thbot(n) * (1.0_R8 + loc_zvir * qbot(n)) ! virtual temp (K)
ssq = 0.98_R8 * qsat(ts(n)) / rbot(n) ! sea surf hum (kg/kg)
Expand Down Expand Up @@ -377,8 +386,8 @@ SUBROUTINE shr_flux_atmOcn(nMax ,zbot ,ubot ,vbot ,thbot , prec_gust, gust_
tau = rbot(n) * ustar * ustar

!--- momentum flux ---
taux(n) = tau * (ubot(n)-us(n)) / vmag
tauy(n) = tau * (vbot(n)-vs(n)) / vmag
taux(n) = tau * (ubot(n)-us(n)) / vmag_old !PMA uses vmag_old for taux
tauy(n) = tau * (vbot(n)-vs(n)) / vmag_old ! tauy c20170620

!--- heat flux ---
sen (n) = cp * tau * tstar / ustar
Expand Down