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<p class="MsoNormal"><span style="color:#1F497D">Anders,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The option of km_opt is about calculation of turbulent diffusivity. If you want to have TKE in your output, you need to (1) use PBL schemes of TKE-related closure such as Mellor-Yamada-Janjic TKE scheme, MYNN
2.5/3<sup>rd</sup> level schemes; (2) to modify entries in IO column for TKE output in Registry file. I hope that is helpful.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Feng <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> wrf-users-bounces@ucar.edu [mailto:wrf-users-bounces@ucar.edu]
<b>On Behalf Of </b>Anders A Nottrott<br>
<b>Sent:</b> Thursday, September 01, 2011 1:13 PM<br>
<b>To:</b> wrf-users@ucar.edu<br>
<b>Subject:</b> [Wrf-users] TKE and velocity perturbation output?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none">I am running some idealized LES cases for a convective ABL over a flat surface. I was wondering if it is possible to get the resolved scale TKE as an output variable. It seems to me that using km_opt=2 in the
‘namelist’ should give the resolved TKE as an output, but I do not find it in my netcdf output file. I found the following in the ARW description document:<o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none">“Optionally, turbulent kinetic energy and any number of scalars such as water vapor mixing ratio, rain/snow mixing ratio, cloud water/ice mixing ratio, and chemical species and tracers.”<o:p></o:p></p>
<p class="MsoNormal">Maybe this is only referring to the output obtained when using a PBL scheme?<o:p></o:p></p>
<p class="MsoNormal">Also is it possible to get information about the velocity perturbation as an output (e.g. u’, v’, w’ or maybe the second moment)? I believe that the U, V, W output variables are the full velocities. If I have to compute TKE and velocity
fluctuation in post processing then I will have a lot of output data from the WRF run and post processing will be memory intensive.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Anders Nottrott<o:p></o:p></p>
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