<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 16, 2017, at 2:11 PM, Carl Schreck <<a href="mailto:cjschrec@ncsu.edu" class="">cjschrec@ncsu.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class="">Hi Jonathan,<div class=""><br class=""></div><div class="">Thanks, I was also getting some values in the tropics that didn't match up with others studies. It's been on my todo list to dig in and see why, but it sounds like you might have already done it.</div><div class=""><br class=""></div><div class="">I'm on travel now, but do you have an alternative NCL function we could test using Bolton?</div><div class=""><br class=""></div><div class="">Thanks!</div><div class="">Carl</div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Tue, Nov 14, 2017 at 5:16 PM, Buzan, Jonathan R <span dir="ltr" class=""><<a href="mailto:jbuzan@purdue.edu" target="_blank" class="">jbuzan@purdue.edu</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word;line-break:after-white-space" class="">
Hi NCL-Talk,
<div class=""><br class="">
</div>
<div class="">I was checking out the pot_temp_equiv function in NCL. Unfortunately, I believe I found an error. <a href="https://secure-web.cisco.com/1t975A3fgQOvifgkhQmrkYIPe--HUce1ITZdLR-Ps1_8-omacnE9XpN_SwbJRg_KCsdRaroqWCWrjXIINpkhj9vMDPJCI3mWCH0ck8OejzUabyKlwFkoJSpzkiunqYNzr6zDzdzWRm_z_5VQXWBgx6-cKFVgQmVxzsWUOLhS_qs_kTYPMFoC5idlJVNdnOrua4Vc9ny1cv4BrVVqeVV_i1olY8_bMYem029nzxbmB_60Imy535iLUTdHGjyZJ6S1L403WBJt1mMrjXURj7jZkrXU5JFH9bmpXUaQQO3NylTDZhDxXPHP84sw9N9hV6vFEbgkz-oba3XP9-n5fkk2OmQAoCnQe46aAE7pkgRHxdVc/https%3A%2F%2Fwww.ncl.ucar.edu%2FDocument%2FFunctions%2FContributed%2Fpot_temp_equiv.shtml" target="_blank" class="">https://www.ncl.ucar.edu/<wbr class="">Document/Functions/<wbr class="">Contributed/pot_temp_equiv.<wbr class="">shtml</a> </div>
<div class="">The descriptions page states it uses Davies-Jones (2009) for the calculation. However, looking at the contributed file, the code uses Stull 1988 §13.1 p. 546, which does not use the lifting condensation temperature. </div>
<div class=""><br class="">
</div>
<div class="">I use Bolton 1980 equation 22 for lifting condensation temperature and equation 39 for equivalent potential temperature. </div>
<div class="">Using typical warm pool values, T = 27°C-31°C, and an average humidity 75% at 1000mb:</div>
<div class=""><br class="">
</div>
<div class="">NCL: pot_temp_equiv <span class="m_6722941186800001275Apple-tab-span" style="white-space:pre-wrap">
</span>= 69.1°C, 72.7°C, 76.4°C, 80.<wbr class="">3°C, 84.3°C</div>
<div class="">Bolton Eqn 39 <span class="m_6722941186800001275Apple-tab-span" style="white-space:pre-wrap">
</span>= 77.8°C, 82.2°C, 86.9°C, 91.8°C, 97.0°C</div>
<div class=""><br class="">
</div>
<div class="">These are substantially different values for the warm pool. This is important for researchers analyzing buoyancy differences for tropical disturbances. </div><span class="HOEnZb"><font color="#888888" class="">
<div class=""><br class="">
</div>
<div class="">-Jonathan R. Buzan</div>
<div class=""><br class="">
</div>
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</font></span></div>
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Schreck III, PhD</b><br class=""></span></span><span style="font-size:11px" class=""><span style="font-family:arial,helvetica,sans-serif" class=""><b class="">Research Scholar / Research </b></span></span><b style="font-family:arial,helvetica,sans-serif;font-size:11px" class="">Assistant Professor</b><span style="font-size:11px" class=""><span style="font-family:arial,helvetica,sans-serif" class=""><br class=""></span></span><a href="http://secure-web.cisco.com/1gJvQ5fJTjUzee90On4sF27RL6lBAnMqxwf-4Tibd6gPExPa0Wv-lUgtsWIvG2Fz4QqcqhDhLtqYbkFrcN4WOTZAOcawO4G8K48jAUJQqduqXjZ8CSm2ygXG9BhzxkFn6JgE7uCLTcX2Qt_brvvpVXBDzaeST4OA2_VxLOElCOOiSrwYtmPxz4RsFpxSWLmi0gkBB7bXO7EmKOyVnVeyQBscUuybG0bfrc9CG-5RG_tFvttWAOZZX4EIxfQI2QGiR85BWHGPw1cBum-EJswtu_-FdOBJk15ZrcUaVxaVg_8kOKvlobH6lVkYfCdyZ0XO9BycUUB8EZimqM8ZUFZ_PVTVqLV8rkor6YAWFVfHh30A/http%3A%2F%2Fwww.cicsnc.org%2F" style="font-family:arial,helvetica,sans-serif;font-size:11px;color:rgb(38,58,143);text-decoration:none;font-weight:bold" target="_blank" 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