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Bug fix in physics/module_sf_noahmp_glacier.F90: only compute glacier albedo in snowalb_bats_glacier if cosz > 0 #1091

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Bug fix in physics/module_sf_noahmp_glacier.F90: only compute glacier albedo in snowalb_bats_glacier if cosz > 0 #1091

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26 changes: 14 additions & 12 deletions physics/SFC_Models/Land/Noahmp/module_sf_noahmp_glacier.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -971,18 +971,20 @@ subroutine snowalb_bats_glacier (nband,cosz,fage,albsnd,albsni)
albsni(1: nband) = 0.

! when cosz > 0

sl=2.0
sl1=1./sl
sl2=2.*sl
cf1=((1.+sl1)/(1.+sl2*cosz)-sl1)
fzen=amax1(cf1,0.)

albsni(1)=0.95*(1.-c1*fage)
albsni(2)=0.65*(1.-c2*fage)

albsnd(1)=albsni(1)+0.4*fzen*(1.-albsni(1)) ! vis direct
albsnd(2)=albsni(2)+0.4*fzen*(1.-albsni(2)) ! nir direct
! https://github.com/ufs-community/ccpp-physics/issues/227
if (cosz>0) then
sl=2.0
sl1=1./sl
sl2=2.*sl
cf1=((1.+sl1)/(1.+sl2*cosz)-sl1)
fzen=amax1(cf1,0.)

albsni(1)=0.95*(1.-c1*fage)
albsni(2)=0.65*(1.-c2*fage)

albsnd(1)=albsni(1)+0.4*fzen*(1.-albsni(1)) ! vis direct
albsnd(2)=albsni(2)+0.4*fzen*(1.-albsni(2)) ! nir direct
endif

end subroutine snowalb_bats_glacier
! ==================================================================================================
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