<br><font size=2 face="sans-serif">Dear WRF help and WRF users,</font>
<br>
<br><font size=2 face="sans-serif">I tried to calculate direct solar irradiance,
which usually is measured by a pyrheliometer<b> </b>(or calculated</font>
<br><font size=2 face="sans-serif">from satellite data) and corrected Registry.EM
(and recompiled WRF) to dump in output SWDOWNC (short-wave down radiation
flux</font>
<br><font size=2 face="sans-serif">for clear sky) and CLDFRA (fraction
of clouds in each cell for every level). CLDFRA can be only 0 (no clouds)
or</font>
<br><font size=2 face="sans-serif">1 (clouds in spatial grid cell) and
I'm not sure how to calculate sensible cloud fraction in every spatial
grid cell</font>
<br><font size=2 face="sans-serif">as the simple counting of 0 and 1 for
certain number of levels (for instance 15) and division of number of 1
on total number</font>
<br><font size=2 face="sans-serif">of levels (CLDFRA = SUM(1)/15) doesn't
have any physical seance to me.</font>
<br>
<br><font size=2 face="sans-serif">In any way using cu_physics = 1 for
grids 1 & 2 (27 and 9 km) running 3-grid WRF I have all zeros for SWDOWNC
(but normal time trends</font>
<br><font size=2 face="sans-serif">for SWDOWN) and 0/1 for CLDFRA. I removed
cumulus (cu_physics = 0 for grids 1 & 2) but it didn't change anything
and</font>
<br><font size=2 face="sans-serif">I still have no values for SWDOWNC (./read_wrf_nc
-m wrfout... gives for SWDOWNC minimum = maximum = 0.0) and</font>
<br><font size=2 face="sans-serif">still have 0/1 values for CLDFRA and
non-zero RAINNC. </font>
<br><font size=2 face="sans-serif">So this trick doesn't help and I'm not
sure that I can switch off anything else in physical parameterisation without
termination of WRF run.</font>
<br>
<br><font size=2 face="sans-serif">If to guess that in every spatial cell
of WRF grid for every time step there is always as minimum one CLDFRA =
1</font>
<br><font size=2 face="sans-serif">it is logical to suggest that SWDOWNC
= 0.0 all the time for all surface cells (as direct solar irradiance is
equal to</font>
<br><font size=2 face="sans-serif">zero in pyrheliometer measurements if
cloud index = 1). Or maybe SWDOWNC short-wave radiation down flux is</font>
<br><font size=2 face="sans-serif">not calculated in WRFv3.0.1 (just defined)?
I didn't dig deep inside Fortran code.</font>
<br>
<br><font size=2 face="sans-serif">Maybe anyone has already had these problems
with SWDOWNC & CLDFRA in WRF? </font>
<br><font size=2 face="sans-serif">Maybe it is easier to write a little
program to calculate short-wave down radiation flux (for clear sky) and
cloud fraction without WRF?</font>
<br>
<br><font size=2 face="sans-serif">Any help is highly appreciable.</font>
<br>
<br><font size=2 face="sans-serif">Thanks a lot,</font>
<br><font size=2 face="sans-serif">Mikhail</font>
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<br><font size=2 color=#8f8f8f face="Arial"><b>Dr. Mikhail Titov |</b></font><font size=2 face="Arial"><b>
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