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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Sure thing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m putting output from HadRM and NARR onto a common 25 km grid.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I will only be adjusting temperature such that once the adjustment has been calculated, I can do the following:
</span><span style="font-size:11.0pt;font-family:"Courier New"">Tavg_dif = Tavg_model - Tavg_narr + adjust<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New"">So, what I need is to be able to make a mask with the adjustment such that it gets computed using 6.5 c/km lapse rate except for over the grid cells over the Cascades and Sierra as
I specified below. Over the mountains the lapse rate is 4.5 c/km.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New"">I want to know how I can mask out a couple of boxes of grid points over the mountains. In the past I have been able to mask out the ocean, for example. But in this work it’s not necessarily
a mask over a certain height (say 2000 meters). Doing so misses most of the Cascades and adds other areas in the high desert that we prefer to leave at 6.5 c/km. Instead we want to do it specifically for the mountain ranges.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New"">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Courier New"">Robert</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> gradsusr-bounces@gradsusr.org [mailto:gradsusr-bounces@gradsusr.org]
<b>On Behalf Of </b>Jeff Duda<br>
<b>Sent:</b> Tuesday, February 18, 2014 12:22 PM<br>
<b>To:</b> GrADS Users Forum<br>
<b>Subject:</b> Re: [gradsusr] Masking out grid boxes for elevation correction<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Robert,<o:p></o:p></p>
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<p class="MsoNormal">Can you be a little more precise in what you want to do? Which two grids are you putting onto a common 25 km grid? Are you trying to adjust just the temperature?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Jeff Duda<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, Feb 18, 2014 at 8:20 AM, Roberto Mera <<a href="mailto:RMera@ucsusa.org" target="_blank">RMera@ucsusa.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">All,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p>I’m trying to apply an elevation correction to model data by adjusting the lapse rate based on NARR. Basically, I’m looking to
<span style="font-family:"Courier New"">use a rate of 4.5 C/km for mountains, otherwise 6.5. where the adjustment is the rate the times the elevation difference.
</span><o:p></o:p></p>
<p><span style="font-family:"Courier New""> </span><o:p></o:p></p>
<p><span style="font-family:"Courier New"">The location where I’d like to apply the masks are</span> lon -122.5 -121 lat 43.5 45.2 for the Oregon Cascades and lat 46 49 for Washington Cascades and lon -121 -117.9, lat 35.5 - 40.5 for the Sierra.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>I’m placing the two grids on a common 25km grid and taking the difference between elevation.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>I appreciate the help.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Robert<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <br>
Jeff Duda<br>
Graduate research assistant<br>
University of Oklahoma School of Meteorology<br>
Center for Analysis and Prediction of Storms<o:p></o:p></p>
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