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    <div class="moz-cite-prefix">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 class="moz-txt-link-freetext" 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 class="moz-txt-link-freetext" 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:<br>
    </div>
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        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D">Xiaoming –<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,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:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,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:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D">Tanya<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D">~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D">Tanya L. Spero<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,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:&quot;Maiandra
            GD&quot;,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:&quot;Maiandra
            GD&quot;,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:&quot;Maiandra
            GD&quot;,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:&quot;Maiandra
            GD&quot;,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:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:9.0pt;font-family:&quot;Maiandra
            GD&quot;,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:&quot;Calibri&quot;,sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">
                <a class="moz-txt-link-abbreviated" href="mailto:wrf-users-bounces@ucar.edu">wrf-users-bounces@ucar.edu</a>
                [<a class="moz-txt-link-freetext" 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 class="moz-txt-link-abbreviated" href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a>; <a class="moz-txt-link-abbreviated" href="mailto:wrfhelp@ucar.edu">wrfhelp@ucar.edu</a><br>
                <b>Cc:</b> Xiaoming Hu <a class="moz-txt-link-rfc2396E" href="mailto:xhu@ou.edu">&lt;xhu@ou.edu&gt;</a><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:&quot;Calibri&quot;,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, &amp;<br>
                             if_no_pbl_nudging_uv, if_no_pbl_nudging_t,
              if_no_pbl_nudging_ph,&amp;<br>
                             if_zfac_uv, k_zfac_uv, dk_zfac_uv, &amp;<br>
                             if_zfac_t, k_zfac_t, dk_zfac_t, &amp;<br>
                             if_zfac_ph, k_zfac_ph, dk_zfac_ph, &amp;<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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