<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Tabish,<div class=""><br class=""></div><div class="">as far as I know this is not possible without tweaking the WRF source code. The simplest option would be to run a post-processing script that uses ncks or cdo to retain only the lowest model level, but you would still have to write out the large files upfront. Modifying the source code should be easy if you just want to hard-code writing out the lowest model level. You could also duplicate the wrf pressure-level diagnostics mechanism to achieve this in a separate stream and suppress output of model-level variables in the standard (history) output stream.</div><div class=""><br class=""></div><div class="">Cheers</div><div class=""><br class=""></div><div class="">Dom</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 24/07/2016, at 11:17 PM, Tabish Ansari <<a href="mailto:tabishumaransari@gmail.com" class="">tabishumaransari@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Hi</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">I am running wrfchem 3.7.1 simulations for my studies. Since I have to run very long duration simulations, it creates huge output files- most parts of which is not useful for my study.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">I have set 31 vertical levels in my simulations however, I need only the lowermost (zeroth) layer of the model for my study. Is it possible to modify WRF code so that it writes out only the lowermost vertical level output- this way my output files will become 30 times smaller which will be very convenient for me.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">I will really appreciate if someone can help me in this regard.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Thanks</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Tabish</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class=""><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div class=""><font size="1" class=""><span style="font-family:tahoma,sans-serif" class="">Tabish U Ansari<br class=""></span></font></div><font size="1" class=""><span style="font-family:tahoma,sans-serif" class="">PhD student, Lancaster Environment Center<br class=""></span></font></div><font size="1" class=""><span style="font-family:tahoma,sans-serif" class="">Lancaster Univeristy<br class=""> <span class="">Bailrigg</span>, <span class="">Lancaster</span>, <br class=""><span class="">LA1 4YW</span>, <span class="">United Kingdom</span></span></font><br class=""></div></div></div>
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