<div dir="ltr"><div class="gmail_default" style="font-family:garamond,times new roman,serif">Dear NCL'ers, </div><div class="gmail_default" style="font-family:garamond,times new roman,serif">As we know WRF's outputs are originally in Eta coordinates. I am trying to understand the logic of how the height (z) is calculated in NCL's wrfusergetvar function. </div><div class="gmail_default" style="font-family:garamond,times new roman,serif"><br></div><div class="gmail_default" style="font-family:garamond,times new roman,serif"><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333px;line-height:12pt;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)"> z  = <a href="https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_getvar.shtml" style="margin:0px;padding:0px;text-decoration-line:none;color:rgb(133,45,133);font-family:verdana,sans-serif"><strong style="margin:0px;padding:0px">wrf_user_getvar</strong></a>(a, "z",time)        ; grid point height</pre><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333px;line-height:12pt;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)">I expect that the height at each eta level should change as a function of x,y, and time. </pre><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333px;line-height:12pt;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)">Can someone tell me how the above function calculates this z? Is there an hydrostatic assumption? In other words, is the z </pre><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333px;line-height:12pt;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)">just geopotential height? Or is it the actual height itself? 
<span style="font-size:13.3333px"><br></span></pre><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333px;line-height:12pt;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)"><span style="font-size:13.3333px">Thank you, </span>
</pre><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333px;line-height:12pt;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)">Prashanth </pre><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333px;line-height:12pt;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)"><br></pre></div></div>