<div dir="ltr"><div>The fortran code [<font size="2"><span style="font-size:11pt"><font size="2"><span style="font-size:11pt">rip_cape.f] </span></font></span></font>invoked by NCL was provided by WRF. NCL developers did not write the code. I think it would be best to write to a WRF help group. <br></div><div><br></div><div>Good Luck<br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 23, 2020 at 1:13 AM Maxime Colin via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<font size="2"><span style="font-size:11pt">Dear community,<br>
</span></font></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<font size="2"><span style="font-size:11pt"><br>
</span></font></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<font size="2"><span style="font-size:11pt">I'm coming back to the below CAPE question since I would be keen to know more on this. Is there anyone I could write to in order to have more information?<br>
</span></font></div>
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<font size="2"><span style="font-size:11pt"><br>
To understand the <span>
in</span>s and outs of the <span>
CAPE</span> <span>
computed</span> by <span>
NCL</span>'s wrf_user_getvar out of my WRF simulations, I would like to have a reliable source of
<span>
in</span>formation on this computation. Note that I use <span>
NCL</span> v6.4.0.<br>
<br>
For example:<br>
<br>
- <span>
Is</span> this CAPE the integrated buoyancy of non-entraining and pseudo-adiabatic parcels? Or does it take
<span>
in</span>to account entrainment and non-adiabatic transformations?<br>
<br>
- Would anybody know by any chance if the "environment" that <span>
is</span> considered by the code to compute <span>
CAPE</span> <span>
is</span> actually the same column as the one from which the parcel was raised, or it
<span>
is</span> the neighbouring columns?<br>
<br>
I can read some basic but useful <span>
in</span>formation on the <span>
NCL</span> website (<a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_cape_2d.shtml" rel="noopener noreferrer" target="_blank">https://www.<span>ncl</span>.ucar.edu/Document/Functions/Built-<span>in</span>/wrf_cape_2d.shtml</a>).
There <span>
is</span> also some <span>
in</span>fo on the RIP code from the UCAR website (<a href="http://www2.mmm.ucar.edu/mm5/documents/ripug_V4.html" rel="noopener noreferrer" target="_blank">http://www2.mmm.ucar.edu/mm5/documents/ripug_V4.html</a>). Are these sources
accurate?</span></font></div>
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<font size="2"><span style="font-size:11pt">There seems to be a disagreement between these 2 sources at least: the
<span>
NCL</span> website claims that the mCAPE <span>
is</span> <span>
computed</span> from the parcel with maximum Theta_e (equivalent potential temperature, I assume) but the RIP User guide on the UCAR webiste says mCAPE
<span>
is</span> <span>
computed</span> from the parcel with maximum q_e (water vapour mixing ratio, I assume). This
<span>
is</span> quite different, no? Does anyone know what <span>
is</span> actually used <span>
in</span> <span>
NCL</span> v.6.4.0.</span></font></div>
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<br>
<font size="2"><span style="font-size:11pt"></span></font></div>
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<font size="2"><span style="font-size:11pt">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
<font size="2"><span style="font-size:11pt">I was also sent a version of the rip_cape.f code but would be keen to have a discussion on this.<br>
</span></font></div>
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<br>
Other related questions:<br>
<br>
- What does the average over 500m depth, used to define a parcel, mean for air that
<span>
is</span> very close to the surface (say first model level at 15m)?<br>
<br>
- <span>
Is</span> it accurate that mCAPE <span>
is</span> calculated as the <span>
CAPE</span> of the parcel with maximum of q_e (or theta_e) only over the lowest 3km of the column? (that should not be too restrictive I think)<br>
<br>
<br>
Thank you for those who have already <span>
in</span>vestigated this <span>
in</span> more details and who are happy to share their knowledge.<br>
<br>
<br>
All the best,<br>
<br>
<br>
Maxime.</span></font><br>
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<pre style="margin-top:14pt;margin-bottom:14pt"><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">Maxime Colin</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
---------------------------------------------</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
Research Associate</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
Climate Change Research Centre</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt"> <br>University of New South Wales, Australia</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt"></span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
</span></font><a href="http://www.ccrc.unsw.edu.au/ccrc-team/students/maxime-colin" id="gmail-m_7855624740884455896LPNoLP" target="_blank"><span id="gmail-m_7855624740884455896LPNoLP"><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">http://www.ccrc.unsw.edu.au/ccrc-team/students/maxime-colin</span></font></span></a><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
</span></font><a href="http://www.climatescience.org.au/staff/profile/mcolin" id="gmail-m_7855624740884455896LPNoLP" target="_blank"><span id="gmail-m_7855624740884455896LPNoLP"><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">http://www.climatescience.org.au/staff/profile/mcolin</span></font></span></a><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
---------------------------------------------</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
+61 (0)421 620 779 / +33 (0)6 25 57 81 93</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">
</span></font><font size="2" face="Candara,sans-serif"><span style="font-size:9pt"><a href="mailto:m.colin@unsw.edu.au" target="_blank">m.colin@unsw.edu.au</a> / </span></font><a href="https://www.normalesup.org/phare/squirrelmail/src/compose.php?send_to=maxime.colin%40normalesup.org" id="gmail-m_7855624740884455896LPNoLP" target="_blank"><span id="gmail-m_7855624740884455896LPNoLP"><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">colinmaxime@hotmail.fr</span></font></span></a></pre>
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