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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">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.<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">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.<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">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> wrf-users-bounces@ucar.edu [mailto:wrf-users-bounces@ucar.edu]
<b>On Behalf Of </b>xiaoming Hu<br>
<b>Sent:</b> Monday, February 29, 2016 4:26 PM<br>
<b>To:</b> wrf-users@ucar.edu; wrfhelp@ucar.edu<br>
<b>Cc:</b> Xiaoming Hu <xhu@ou.edu><br>
<b>Subject:</b> [Wrf-users] spectral nudging for water vapor?<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" 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>
<o:p></o:p></span></p>
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