<p dir="ltr">I did spectral nudging for moisture above PBL 4months ago , I guess moisture can also be nudged</p>
<div class="gmail_quote">On Apr 7, 2016 8:11 PM, "Xiaoming Hu" <<a href="mailto:xhu@ou.edu">xhu@ou.edu</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Hello<br>
<br>
I separated my seasonal run into several segments, the latter
runs are restarted from the previous runs. <br>
<br>
But it seems the spectral nudging only worked for the 1st
segment run, but not for the latter restart runs. <br>
<br>
Does the spectral nudging not work for restart runs? Or did I
set something wrong? <br>
See my namelist for a latter restart run:<br>
<a href="http://www.caps.ou.edu/micronet/WRF-UCM/FocusON_OKC/WRFV3.7.1/with_rr_fixed/wrfNCEP_DOE2d_UCM_Snudge_WangRec.2005060100/namelist.input_2005-08-09_00:00" target="_blank">http://www.caps.ou.edu/micronet/WRF-UCM/FocusON_OKC/WRFV3.7.1/with_rr_fixed/wrfNCEP_DOE2d_UCM_Snudge_WangRec.2005060100/namelist.input_2005-08-09_00:00</a><br>
<br>
One thing I can think of is regarding gfdda_end_h <br>
<br>
Should it be set as the time starting from restart time or
from the very beginning time? <br>
Currently I set it starting from the restart time. <br>
<br>
Thanks a lot!<br>
Xiaoming <br>
<a href="http://faculty-staff.ou.edu/H/Xiaoming.Hu-1/" target="_blank">http://faculty-staff.ou.edu/H/Xiaoming.Hu-1/</a><br>
<br>
On 03/01/2016 07:09 AM, Spero, Tanya wrote:<br>
</div>
<blockquote type="cite">
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<p class="MsoNormal"><span>Xiaoming –<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span>The current WRF code does
not allow spectral nudging of moisture. However, my
colleagues and I built some code into WRF to allow spectral
nudging toward moisture, and we published on how using
spectral nudging toward moisture can improve regional
climate simulations. We have not contributed that code back
to NCAR yet to be considered for the public release of WRF.<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span>Spero, T. L., M. J. Otte,
J. H. Bowden, and C. G. Nolte, 2014: Improving the
representation of clouds, radiation, and precipitation using
spectral nudging in the Weather Research and Forecasting
model. J. Geophys. Res. Atmos., 119, 11,682-11,694,
doi:10.1002/2014JD022173.<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span>Tanya<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span>~~~~~~~~~~~~~~~~~~~~~~~~~~~<u></u><u></u></span></p>
<p class="MsoNormal"><span>Tanya L. Spero<u></u><u></u></span></p>
<p class="MsoNormal"><span>National Exposure
Research Laboratory<u></u><u></u></span></p>
<p class="MsoNormal"><span>U.S. Environmental
Protection Agency<u></u><u></u></span></p>
<p class="MsoNormal"><span>109 T. W. Alexander Dr.,
Mail Drop E243-01<u></u><u></u></span></p>
<p class="MsoNormal"><span>Research Triangle Park,
NC 27711 USA<u></u><u></u></span></p>
<p class="MsoNormal"><span>+1-919-541-7533 (voice)<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<p class="MsoNormal"><span><u></u> <u></u></span></p>
<div>
<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">
<a href="mailto:wrf-users-bounces@ucar.edu" target="_blank">wrf-users-bounces@ucar.edu</a>
[<a href="mailto:wrf-users-bounces@ucar.edu" target="_blank">mailto:wrf-users-bounces@ucar.edu</a>]
<b>On Behalf Of </b>xiaoming Hu<br>
<b>Sent:</b> Monday, February 29, 2016 4:26 PM<br>
<b>To:</b> <a href="mailto:wrf-users@ucar.edu" target="_blank">wrf-users@ucar.edu</a>; <a href="mailto:wrfhelp@ucar.edu" target="_blank">wrfhelp@ucar.edu</a><br>
<b>Cc:</b> Xiaoming Hu <a href="mailto:xhu@ou.edu" target="_blank"><xhu@ou.edu></a><br>
<b>Subject:</b> [Wrf-users] spectral nudging for water
vapor?<u></u><u></u></span></p>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Calibri",sans-serif"><br>
Can I do spectral nudging for water vapor in WRF? <br>
<br>
I did 2 runs, one setting "gq = 0" and the other one with
"gq = 1.0E-5"<br>
The 2 runs turned out to be identical. <br>
<br>
I checked the code<br>
SUBROUTINE
spectral_nudging(grid,itimestep,dt,xtime,id,analysis_interval,
end_fdda_hour, &<br>
if_no_pbl_nudging_uv, if_no_pbl_nudging_t,
if_no_pbl_nudging_ph,&<br>
if_zfac_uv, k_zfac_uv, dk_zfac_uv, &<br>
if_zfac_t, k_zfac_t, dk_zfac_t, &<br>
if_zfac_ph, k_zfac_ph, dk_zfac_ph, &<br>
guv, gt, gph, <br>
<br>
<br>
appears gq is not even passed in. <br>
<br>
So I guess the current WRF can not do spectral nudging for
water vapor. <br>
<br>
Could anybody confirm? <br>
<br>
Thanks<br>
<br>
Xiaoming <br>
<br>
<u></u><u></u></span></p>
</div>
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</blockquote>
<br>
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