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<font size="2"><span style="font-size:11pt">Dear community,<br>
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<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 data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
in</span>s and outs of the <span data-markjs="true" class="marksbx5r9md0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
CAPE</span> <span data-markjs="true" class="mark3g4el2dr4" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
computed</span> by <span data-markjs="true" class="markmvvpnhuwa" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
NCL</span>'s wrf_user_getvar out of my WRF simulations, I would like to have a reliable source of
<span data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
in</span>formation on this computation. Note that I use <span data-markjs="true" class="markmvvpnhuwa" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
NCL</span> v6.4.0.<br>
<br>
For example:<br>
<br>
- <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
Is</span> this CAPE the integrated buoyancy of non-entraining and pseudo-adiabatic parcels? Or does it take
<span data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
in</span>to account entrainment and non-adiabatic transformations?<br>
<br>
- Would anybody know by any chance if the "environment" that <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> considered by the code to compute <span data-markjs="true" class="marksbx5r9md0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
CAPE</span> <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> actually the same column as the one from which the parcel was raised, or it
<span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> the neighbouring columns?<br>
<br>
I can read some basic but useful <span data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
in</span>formation on the <span data-markjs="true" class="markmvvpnhuwa" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
NCL</span> website (<a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_cape_2d.shtml" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable">https://www.<span data-markjs="true" class="markmvvpnhuwa" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">ncl</span>.ucar.edu/Document/Functions/Built-<span data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">in</span>/wrf_cape_2d.shtml</a>).
There <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> also some <span data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
in</span>fo on the RIP code from the UCAR website (<a href="http://www2.mmm.ucar.edu/mm5/documents/ripug_V4.html" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable">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 data-markjs="true" class="markmvvpnhuwa" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
NCL</span> website claims that the mCAPE <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> <span data-markjs="true" class="mark3g4el2dr4" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
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 data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> <span data-markjs="true" class="mark3g4el2dr4" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
computed</span> from the parcel with maximum q_e (water vapour mixing ratio, I assume). This
<span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> quite different, no? Does anyone know what <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> actually used <span data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
in</span> <span data-markjs="true" class="markmvvpnhuwa" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
NCL</span> v.6.4.0.</span></font></div>
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<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>
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Other related questions:<br>
<br>
- What does the average over 500m depth, used to define a parcel, mean for air that
<span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> very close to the surface (say first model level at 15m)?<br>
<br>
- <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
Is</span> it accurate that mCAPE <span data-markjs="true" class="markv4l3tjktm" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
is</span> calculated as the <span data-markjs="true" class="marksbx5r9md0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
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 data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
in</span>vestigated this <span data-markjs="true" class="markist6grha0" data-ogac="" data-ogab="" data-ogsc="" data-ogsb="">
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" target="_blank" id="LPNoLP"><span id="LPNoLP"><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" target="_blank" id="LPNoLP"><span id="LPNoLP"><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">m.colin@unsw.edu.au / </span></font><a href="https://www.normalesup.org/phare/squirrelmail/src/compose.php?send_to=maxime.colin%40normalesup.org" target="_blank" id="LPNoLP"><span id="LPNoLP"><font size="2" face="Candara,sans-serif"><span style="font-size:9pt">colinmaxime@hotmail.fr</span></font></span></a></pre>
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