[Ncep.list.emc.monsoondesk] Regarding the Snow-Rain conversion in CFS
Prajeesh A.G.
prajeesh.cat at tropmet.res.in
Mon Oct 20 09:45:18 UTC 2014
I have a doubt regarding the snow-rain conversion in CFS.
In the model, the total precipitation is considered as snow fall if the temperature at 850hpa is below 0C.
See the below code from gbphys_v.f
! --- ... lu: snow-rain detection is performed in land/sice module
! factor=weighted mean tep.
do i = 1, im
tprcp(i) = rain(i) ! clu: rain -> tprcp
srflag(i) = 0.0 ! clu: default srflag as 'rain'
if ( t850(i) <= 273.16 ) then
srflag(i) = 1.0 ! clu: set srflag to 'snow'
...................
do i = 1, im
! if ( t850(i)<=273.16 .and. slmsk(i)/=0.0 ) then
if ( t850(i) <= 273.16 ) then
lprec_cc(i) = 0.0
snw_cc(i) = rain(i)
else
lprec_cc(i) = rain(i)
snw_cc(i) = 0.0
endif
enddo
Here the 'srflag' is used in the sfc_drv (Land model) to detect whether the falling precipitation is snow or not. Similarly snw_cc goes to ocean model.
My doubt is, where is the latent heat of fusion released during this conversion?
Regards..
Prajeesh A G
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