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Descriptions of LSM perturbations are added to sfc_drv.f, sfc_diff.f and sflx.f #141

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Merged
climbfuji merged 3 commits into from
Aug 13, 2018
Merged

Descriptions of LSM perturbations are added to sfc_drv.f, sfc_diff.f and sflx.f #141

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9a648cb
modified: sfc_diff.f
lulinxue Aug 13, 2018
7d65afd
modified: sflx.f
lulinxue Aug 13, 2018
7408f86
modified: sfc_drv.f
lulinxue Aug 13, 2018
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7 changes: 7 additions & 0 deletions physics/sfc_diff.f
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Expand Up @@ -258,6 +258,13 @@ subroutine sfc_ex_coef_run &
endif
! - Calculate the roughness length for heat (see eq.(1) of \cite zheng_et_al_2012 ) .
! mg, sfc-perts: add surface perturbations to z0max over land
!! Following Gehne et al. (2018) \cite gehne_et_al_2018, a perturbation of the momentum
!! roughness length (z0pert) is added using a logrithmic scaling. The spatial pattern of
!! z0pert is drawn from a normal distribution with a standard deviation of 0.14 while is
!! bounded between -0.5 and 0.5. Similarly, a perturbation of the ratio between the roughness
!! length for heat to the momentum roughness length (ztpert) is added. The spatial pattern
!! of ztpert is drawn from a normal distribution with a standard deviation of 0.08.

if ( islimsk(i) == 1 .and. z0pert(i) /= 0.0 ) then
z0max = z0max * (10.**z0pert(i))
endif
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7 changes: 7 additions & 0 deletions physics/sfc_drv.f
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Expand Up @@ -590,6 +590,13 @@ subroutine lsm_noah_run &

! perturb vegetation fraction that goes into sflx, use the same
! perturbation strategy as for albedo (percentile matching)
!! Following Gehne et al. (2018) \cite gehne_et_al_2018, a perturbation of vegetation
!! fraction is added to account for the uncertainty. A percentile matching technique
!! is applied to guarantee the perturbed vegetation fraction is bounded between 0 and
!! 1. The standard deviation of the perturbations is 0.25 for vegetation fraction of
!! 0.5 and the perturbations go to zero as vegetation fraction approaches its upper
!! or lower bound.

vegfp = vegfpert(i) ! sfc-perts, mgehne
! sfc perts, mgehne
if (pertvegf(1)>0.0) then
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9 changes: 9 additions & 0 deletions physics/sflx.f
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Expand Up @@ -426,6 +426,15 @@ subroutine gfssflx & ! --- inpu
! z0, czil, xlai, csoil ) !

! --- ... bexp sfc-perts, mgehne
!! Following Gehne et al. (2018) \cite gehne_et_al_2018, a perturbation of LAI
!! "leaf area index" (xlaip) and a perturbation of the empirical exponent parameter
!! b in the soil hydraulic conductivity calculation (bexpp) are added to account for
!! the uncertainties of LAI and b associated with different vegetation types and soil
!! types using a linear scaling. The spatial pattern of xlaip is drawn from a normal
!! distribution with a standard deviation of 0.25 while makes the LAI between 0 and 8.
!! The spatial pattern of bexpp is drawn from a normal distribution with a standard
!! deviation of 0.4, and is bounded between -1 and 1.

if( bexpp < 0.) then
bexp = bexp * max(1.+bexpp, 0.)
endif
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