<div dir="ltr"><div>True: "Surface pressure is not always 10,000pa."</div><div><br></div><div>However, if surface pressure is not on the file, I am not sure what can be done. <br></div><div>Perhaps, you have other information which might allow you to estimate the surface pressure.</div><div>==========</div><div><br></div><div>Failing that, using p0=10000 is a backup.</div><div><br></div><div>Remember, the function requires top=to=bottom ordering.</div><div>===<br></div><div><br></div><div> dimv = dimsizes(v)</div><div> <br></div><div>; v(time,level, lat,lon) ... 4D<br></div><div><br></div><div> ntim = dimv(0) <br></div><div> nlev = dimv(1)</div><div> nlat = dimv(2)</div><div> mlon = dimv(3)<br></div><div><br></div><div> p0 = 10000.0</div><div> psfc = comform_dims(p0, (/ntim,nlat,mlon/)) ; psfc(ntim,nlat,mlon) one less dimension than 'v'</div><div>================</div><div><br></div><div><div>; v(level, lat,lon) ... 3D<br></div><div> <br></div><div> nlev = dimv(0)</div><div> nlat = dimv(1)</div><div> mlon = dimv(2)<br></div><div><br></div><div> p0 = 10000.0</div><div> psfc = comform_dims(p0, (/nlat,mlon/)) ; psfc(nlat,mlon) one less dimension than 'v'</div><div>==</div><div><pre> zmpsi = <strong>zonal_mpsi</strong>(v,p,psfc)
; Use <a href="http://www.ncl.ucar.edu/Document/Functions/Contributed/zonal_mpsi_Wrap.shtml"><strong>zonal_mpsi_Wrap</strong></a> if metadata retention is desired
; zmpsi = <a href="http://www.ncl.ucar.edu/Document/Functions/Contributed/zonal_mpsi_Wrap.shtml"><strong>zonal_mpsi_Wrap</strong></a>(v,p,psfc )<br><br></pre><pre> printVarSummary(zmpsi) <br></pre></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 21, 2021 at 2:00 AM Chathurika 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"><p style="font-family:Arial">
Many many thanks for the reply.
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<p style="font-family:Arial">
<br>
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<p style="font-family:Arial">
How can I get the surface pressure if I was given meridional wind velocity. Surface pressure is not always 10,000pa.
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So how can I get this ps which is mentioned in <span style="font-family:Arial"><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/zonal_mpsi.shtml" target="_blank">http://www.ncl.ucar.edu/Document/Functions/Built-in/zonal_mpsi.shtml</a></span>
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<br>
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<p>
Thanks again
</p>
<blockquote name="replyContent" style="font-family:Arial;padding-left:5px;margin-left:5px;border-left:2px solid rgb(182,182,182);margin-right:0px">
-----Original Messages-----<br>
<b>From:</b><span id="gmail-m_-8062607240161511657rc_from">"Soma Roy" <<a href="mailto:somaroy892@gmail.com" target="_blank">somaroy892@gmail.com</a>></span><br>
<b>Sent Time:</b><span id="gmail-m_-8062607240161511657rc_senttime">2021-05-21 03:21:15 (Friday)</span><br>
<b>To:</b> Chathurika <<a href="mailto:chatu@scsio.ac.cn" target="_blank">chatu@scsio.ac.cn</a>><br>
<b>Cc:</b> ncl-talk <<a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@ucar.edu</a>><br>
<b>Subject:</b> Re: [ncl-talk] zonal_mpsi<br>
<br>
<div dir="auto">
You can mean along longitude or latitude.
<div dir="auto">
<br>
</div>
<div dir="auto">
Your aim is to reduce 1 dimension from the dataset you are using.
<div dir="auto">
<br>
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<div dir="auto">
Hope this helps.
</div>
<div dir="auto">
<br>
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<div dir="auto">
Cheers!!
</div>
<div dir="auto">
Soma
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">
On Fri, May 21, 2021, 00:48 Chathurika via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu" target="_blank">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">
<p style="font-family:Arial">
<span style="font-family:Georgia;font-size:16px">Dear all,</span>
</p>
<p style="font-family:Arial">
<span style="font-family:Georgia;font-size:16px"><br>
</span>
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<p style="font-family:Arial">
<span style="font-family:Georgia;font-size:16px">I want to calculate zonal mean meridional stream function using "zonal_mpsi" function. I have a dataset which is meridional velocity (time, plev, lat, lon). </span>
</p>
<p>
<span style="font-family:Georgia"><span style="font-size:16px"><br>
</span></span>
</p>
<p>
<span style="font-family:Georgia"><span style="font-size:16px">I am little bit confused about what is 'ps' (surface pressures). Same dimensions as velocity but the level and unit must be pa. Could you please tell me what should I use for the ps?</span></span>
</p>
<p>
<span style="font-family:Georgia"><span style="font-size:16px"><br>
</span></span>
</p>
<p>
<span style="font-family:Georgia"><span style="font-size:16px">I am sorry about the silly question but please help me.</span></span>
</p>
<p>
<span style="font-family:Georgia"><span style="font-size:16px"><br>
</span></span>
</p>
<p>
<span style="font-family:Georgia"><span style="font-size:16px">Many many thanks </span></span>
</p>
<p>
<span style="font-family:Georgia"><span style="font-size:16px">and best regards,</span></span>
</p>
Chathu<br>
<br>
<span style="font-family:Arial">
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<span style="font-style:italic"><span style="font-size:x-small">Wickramage Chathurika Hemamali</span></span>
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