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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">Xiaoming –<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">If you want to use spectral nudging throughout your long run, then you need gfdda_end_h to be the length of your entire simulation, not just the restart segment.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">Tanya<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">Tanya L. Spero<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">National Exposure Research Laboratory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">U.S. Environmental Protection Agency<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">109 T. W. Alexander Dr., Mail Drop E243-01<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">Research Triangle Park, NC 27711 USA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D">+1-919-541-7533 (voice)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Maiandra GD",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> Xiaoming Hu [mailto:xhu@ou.edu]
<br>
<b>Sent:</b> Thursday, April 07, 2016 1:10 PM<br>
<b>To:</b> wrf-users@ucar.edu; wrfhelp@ucar.edu<br>
<b>Cc:</b> Spero, Tanya <Spero.Tanya@epa.gov><br>
<b>Subject:</b> Spectral nudging not working for restart run? gfdda_end_h should be set starting from the restart time or the very beginning time?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">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">
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/">http://faculty-staff.ou.edu/H/Xiaoming.Hu-1/</a><br>
<br>
On 03/01/2016 07:09 AM, Spero, Tanya wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt">Xiaoming –</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">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.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">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.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Tanya</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Tanya L. Spero</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">National Exposure Research Laboratory</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">U.S. Environmental Protection Agency</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">109 T. W. Alexander Dr., Mail Drop E243-01</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Research Triangle Park, NC 27711 USA</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt">+1-919-541-7533 (voice)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt"> </span><o:p></o:p></p>
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<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">wrf-users-bounces@ucar.edu</a> [<a href="mailto:wrf-users-bounces@ucar.edu">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">wrf-users@ucar.edu</a>; <a href="mailto:wrfhelp@ucar.edu">
wrfhelp@ucar.edu</a><br>
<b>Cc:</b> Xiaoming Hu <a href="mailto:xhu@ou.edu"><xhu@ou.edu></a><br>
<b>Subject:</b> [Wrf-users] spectral nudging for water vapor?</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<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>
<br>
</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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