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<div>THank you very much！</div>
<div dir="ltr">It is very useful for me！</div>
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<div dir="ltr">Best，</div>
<div dir="ltr">Tianhang</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>发件人:</b> Barry Lynn <barry.h.lynn@gmail.com><br>
<b>发送时间:</b> Tuesday, August 17, 2021 3:50:15 PM<br>
<b>收件人:</b> Dennis Shea <shea@ucar.edu><br>
<b>抄送:</b> Tianhang Zhang <tianhang.zhang@postgrad.manchester.ac.uk>; ncl-talk@mailman.ucar.edu <ncl-talk@mailman.ucar.edu><br>
<b>主题:</b> Re: [ncl-talk] about frontogenesis</font>
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<div dir="ltr">Hello:
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<div>Sorry for not responding earlier -- I was travelling.</div>
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<div>Here is an example program where I calculated frontogenesis. I obtained it from someone else, who I can't recall at the moment. I modified it a bit.</div>
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<div>Perhaps this will help you?</div>
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<div dir="ltr" class="x_gmail_attr">On Mon, Aug 9, 2021 at 12:59 AM Dennis Shea via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br>
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<div>NCL does not have an explicit '<b>frontogenesis</b>' function.</div>
<div>Certainly, one could be written but, as far as I know, nobody has done this.<br>
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<div>NCL does have <b>'<a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/qvector_isobaric.shtml" target="_blank">qvector_isobaric</a></b>' and a variant '<a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/qvector_isobaric_cfd.shtml" target="_blank"><b>qvector_isobaric_cfd</b></a>'
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<div>Q-vectors can be used to understand physical processes such as vertical motion and frontogenesis.</div>
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<div>However, NCL's functions are for global grids and the needed terms are calculated using spherical harmonics.
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<div>These <b>can not</b> be used for WRF grids.</div>
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<div>Perhaps, the WRF community can offer some assistance.</div>
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<div dir="ltr" class="x_gmail_attr">On Sun, Aug 8, 2021 at 3:09 PM Tianhang Zhang via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu" target="_blank">ncl-talk@mailman.ucar.edu</a>> wrote:<br>
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<span style="margin:0px; font-size:12pt; background-color:rgb(255,255,255)">Hi, </span>
<div style="margin:0px; font-size:12pt; background-color:rgb(255,255,255)">I would like to know how to use NCL to calculate frontogenesis using wrf data. Do you have any scripts? </div>
<div style="margin:0px; font-size:12pt; background-color:rgb(255,255,255)">Thank you</div>
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<div style="margin:0px; font-size:12pt; background-color:rgb(255,255,255)">Best, </div>
<span style="margin:0px; font-size:12pt; background-color:rgb(255,255,255)">Tianhang</span><br>
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<div dir="ltr">Barry H. Lynn, Ph.D
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