<div dir="ltr"><div><div><div><div><div><span><span>Hello Chao Tang,<br><br></span></span></div><div><span><span>I'm sure you can get what you want ..... </span></span></div><div><span><span>It may be relatively simple or it *may* involve multiple steps (multiple files).<br><br>[1]<br></span></span></div><div><span><span>I do not work with the CMIP5 archive. Certainly not the "</span></span><span><span><a href="http://view.es-doc.org/?renderMethod=name&type=cim.1.software.ModelComponent&name=HadGEM2-ES&project=CMIP5" target="_blank">HadGEM2-ES</a></span> : Hadley Global Environment Model 2 - Earth System</span>" 6-hrly output.<br><br></div><div>If there is a file corresponding to <br><br> hus_6hrLev_HadGEM2-ES_historical_r1i1p1_198412010600.nc<br></div><div><br></div><div><br></div><div> double hus(time, lev, lat, lon) ;<br></div><div><p> hus:standard_name = "specific_humidity" ;</p>
<p> hus:long_name = "Specific Humidity" ;</p><p><br></p></div><div><br></div><div>that contains pressure values at each grid for all levels, for example,</div><div><br><div> pressure_6hrLev_HadGEM2-ES_historical_r1i1p1_198412010600.nc<br></div></div><div><br></div><div><div> double pressure(time, lev, lat, lon) ;<br></div><div><p> pressure:standard_name = "pressure" ;</p><p> pressure:long_name = "Pa" ; <=== or "hPa"</p><p><br></p><p>then the process is fairly simple:</p><p> level = (/1, 2, 3, 5, 7, 10, 20, 30, 50, 70, 100, 125, 150, 175, 200, 225, \</p>
<p> 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 775, 800, 825, \</p>
<p> 850, 875, 900, 925, 950, 975, 1000 /)*100 </p><p> level@units = Pa"</p><p><br></p><p> fhus = addfile("hus_6hrLev_HadGEM2-ES_historical_r1i1p1_198412010600.nc","r")</p><p> fprs = addfile("pressure_6hrLev_HadGEM2-ES_historical_r1i1p1_198412010600.nc","r")</p><p> q = fhus->hus ; (time,lev,lat,lon)</p><p> p = fprs->pressure ; (time,lev,lat,lon)</p><p> ;; <a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/int2p_n_Wrap.shtml" target="_blank">https://www.ncl.ucar.edu/Document/Functions/Contributed/int2p_n_Wrap.shtml</a></p></div></div><div><br></div><div> <span style="color:rgb(0,0,0);font-family:courier;font-size:13.3333330154419px;line-height:16px">linlog = -1 ; any option</span></div><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333330154419px;line-height:16px;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)"> q_isobaric = <strong style="margin:0px;padding:0px">int2p_n_Wrap</strong>(p,q,level,linlog,0) ; <span style="font-family:arial,sans-serif;font-size:small;line-height:normal;color:rgb(34,34,34)">(time,lev,lat,lon)</span></pre><pre style="margin-top:0px;margin-bottom:0px;padding:0px;font-size:13.3333330154419px;line-height:16px;font-family:courier;border-style:solid;border-width:0px 0px 15px;border-color:transparent;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:small;line-height:normal;color:rgb(34,34,34)"> printVarSummary(q_isobaric)</span></pre><div><span><span><br>[2]<br></span></span></div><div>If [1] is not available, the user (you) must calculate the pressure values yourself.</div><div>Again, I do not work with HadGEM2-ES data.</div><div><br>By definition, the hybrid height coordinate is <br><br><span> z(t,k,j,i) = a(k) + b(k)*orog(t,j,i) <br><br><-- </span>or, if t is degenerate ('t' is of size 1)<br><br> <span> z(k,j,i) = a(k) + b(k)*orog(j,i)</span></div><div><br></div><div>'b_bnds' and 'orog' are on the 'hus' file.<br><pre><span>=====<br></span></pre><pre><span> On the file you provided, using NCL syntax<br><br></span></pre><pre><span> b = 0.5*( b_bnds(:,0) + </span><span><span>b_bnds(:,1) )</span> ; b[*]</span></pre> So, 'we' have the b(k) .. <br><br><br>What are the 'a(k)' ? Can we use the following?<br><br></div> a = lev ; a(k) = lev(k)<br><br></div><div>In this case heights at each level and grid point can readily be computed using the above formula.<br><br></div><div> z(time, lev, lat, lon) or z(lev, lat, lon) <br></div><div><br>====<br></div><div>Still, there is no 'pressure' information available. Values must be computed. This is the key.</div><div><br></div>How can the *pressures* at each hybrid height coordinate be obtained?<br></div>Certainly, the pressure levels could be *estimated* from the standard atmosphere<br> <a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/stdatmus_z2tdp.shtml" target="_blank">http://www.ncl.ucar.edu/Document/Functions/Built-in/stdatmus_z2tdp.shtml</a></div><div>However, it is very unlikely that this is what you want.</div><div>====<br><br></div><div>The hydrostatic equation could be used if surface pressure values are available. This requires orography, temperature, humidity and surface pressure. </div><div><br></div><div>Use the hydrostatic formula:</div><div><br></div><div> z2-z1 = (T*R/g) ln (p1/p2)</div><div><br></div><div>where z2 and z1 are the calculated height values, g=gravity, R= dry gas constant</div><div><br></div><div> p2 = p1*exp[(-(g/RT)*(z2-z1)] </div><div><br></div><div>Technically, 'T' should be mean *layer virtual temperature* (which requites 'q')</div><div><br></div><div>For example, if z1=0 (mean sea level) and 'pmsl' is the sea level pressure, the pressure at an arbitrary height 'z' is</div><div><br></div><div> p = pmsl*exp(-g*z/(R*T)) </div><div><br></div><div>--</div><div>In your case, initially, z1 could initially be orography [ 'orog' ] and 'pmsl' could be surface pressure ('ps').</div><div>Then, use the calculated 'z' and 'layer T' to create a 'pressure' array at each grid point and level.</div><div>Then us [1] for calculation.</div><div><br></div><div>Good luck </div><div><br></div><div> </div><div><br></div><div> </div><div><br></div><div> </div></div><div><div><br><div><div><br><br><div><br><br><div><div><div><br></div></div></div></div></div></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 22, 2015 at 12:10 AM, chao.tang <span dir="ltr"><<a href="mailto:chao.tang@univ-reunion.fr" target="_blank">chao.tang@univ-reunion.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi Dennis et all,<div><br><div><br></div><div>I send you these two file, I want to convert the vertical levels from hybrid height coordinate to pressure level.</div><div><br></div><div>As exampled bellow I attached two files with just one time step.</div><div><br></div><div></div></div></div><br><div style="word-wrap:break-word"><div><div></div></div></div><br><div style="word-wrap:break-word"><div><div></div><div><br></div><div>the first file (HadGEM2 one ) is in hybrid height coordinate, the second (EIN75) is in pressure levels.</div><div>Please note that they cover different domains, the EIN75 one was cutted to reduce the size for easier transfer by email.</div><div><br></div><div>thanks very much.</div><div><br></div><div><br><div>
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style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font color="#6666cc" face="Arial"><b>Best regards,</b></font></span></span></span></span></span></div><div><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font color="#6666cc" face="Arial"><b>Chao TANG</b></font></span></span></span></span></span></div><div style="font-family:Helvetica;font-size:18px;font-weight:normal;font-style:normal"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><i style="color:rgb(102,102,204);font-family:Arial,sans-serif;font-size:13px">--------------------------------------</i></span></span></span></span></span><i 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style="border-collapse:separate"><span style="border-collapse:separate"><font color="#6666cc">97744 ST DENIS CEDEX 9</font></span></span></span></span></span></div><div style="color:rgb(0,0,0);font-family:Helvetica;font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="border-collapse:separate"><font color="#6666cc">Mobile: </font><a href="mailto:secretariat.le2p@univ-reunion.fr" style="font-family:Arial,sans-serif;font-size:13px;color:rgb(224,101,24);text-decoration:none" target="_blank">0693 91 57 38</a><font color="#6666cc"><br><font face="Arial, sans-serif">Courriel:</font><font face="Arial, sans-serif"> </font></font><a href="mailto:secretariat.le2p@univ-reunion.fr" style="font-family:Arial,sans-serif;font-size:13px;color:rgb(224,101,24);text-decoration:none" target="_blank">chao.tang@univ-reunion.fr </a></span></div><div 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<br><div><blockquote type="cite"><div>On 15 Jun 2015, at 19:25, Dennis Shea <<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>> wrote:</div><br><div><div dir="ltr">From the file and dump you sent offline:<br><br><div><span style="white-space:pre-wrap"> </span>double lev(lev) ;</div><div><span style="white-space:pre-wrap"> </span>lev:bounds = "lev_bnds" ;</div><div><span style="white-space:pre-wrap"> </span>lev:units = "m" ;</div><div><span style="white-space:pre-wrap"> </span>lev:axis = "Z" ;</div><div><span style="white-space:pre-wrap"> </span>lev:positive = "up" ;</div><div><span style="white-space:pre-wrap"> </span>lev:long_name = "hybrid height coordinate" ;</div><div><span style="white-space:pre-wrap"> </span>lev:standard_name = "atmosphere_hybrid_height_coordinate" ;</div><div><span style="white-space:pre-wrap"> </span>lev:formula = "z(k,j,i) = a(k) + b(k)*orog(j,i)" ;</div><div><span style="white-space:pre-wrap"> </span>lev:formula_terms = "a: lev b: b orog: orog" ;<br><br></div><div>The "b" coefficient variable is present <br><br><div><span style="white-space:pre-wrap"> </span>double b(lev) ;</div><div><span style="white-space:pre-wrap"> </span>b:long_name = "vertical coordinate formula term: b(k)" ;<br><br>b = 0.99771648645401, 0.990881502628326, 0.979542553424835, 0.9637770652771, <br> 0.943695485591888, 0.919438362121582, 0.891178011894226, <br> 0.859118342399597, 0.823493480682373, 0.784570515155792, <br> 0.742646217346191, 0.698050200939178, 0.651142716407776, <br> 0.602314412593842, 0.55198872089386, 0.500619947910309, 0.44869339466095, <br> 0.39672577381134, 0.34526526927948, 0.294891387224197, 0.24621507525444, <br> 0.199878215789795, 0.156554222106934, 0.116947874426842, <br> 0.0817952379584312, 0.0518637150526047, 0.0279368180781603, <br> 0.0107164792716503, 0.00130179093685001, 0, 0, 0, 0, 0, 0, 0, 0, 0 ;<br><br></div><span style="white-space:pre-wrap"><br></span></div><div><span style="white-space:pre-wrap">However, there is no "a" coefficient variable present (nor is there an "a_bnds" coefficient variable).<br><br></span></div><div><span style="white-space:pre-wrap">If you send another file, please only send one time-step containing the 'a' and 'be' coefficients.<br>... that is all that is needed<br><br></span></div><div><span style="white-space:pre-wrap">Also, what might a sample pressure level variable look like"<br><br></span></div><div>Is it isobaric levels p(lev) or a 4D pressure variable: p(time,lev,lat,lon)<br><br></div><div>If the former [ p(lev] ] just include in an email; if 4D please send as a netCDF file.<br><br></div><div>THX<br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 15, 2015 at 6:16 AM, chao.tang <span dir="ltr"><<a href="mailto:chao.tang@univ-reunion.fr" target="_blank">chao.tang@univ-reunion.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hello <span style="font-size:inherit;background-color:rgb(255,255,255)">everyone,</span><div><br></div><div><br></div><div>I was searching for the solution to converting pressure levels to hybrid height coordinates (unit: m, output of HadGEM2-ES).</div><div><br></div><div>Any idea would be really appreciated.</div><div><br></div><div>thanks in advance, best wishes.</div><div><br></div><div><br></div><div><br></div><div>
<div style="letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="font-family:Helvetica;font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font face="Arial" color="#6666cc"><b>Best regards,</b></font></span></span></span></span></span></div><div><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font face="Arial" color="#6666cc"><b>Chao TANG</b></font></span></span></span></span></span></div><div style="font-family:Helvetica;font-size:18px;font-weight:normal;font-style:normal"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><i style="color:rgb(102,102,204);font-family:Arial,sans-serif;font-size:13px">--------------------------------------</i></span></span></span></span></span><i style="color:rgb(102,102,204);font-family:Arial,sans-serif;font-size:13px">--------------------------------------</i><i style="color:rgb(102,102,204);font-family:Arial,sans-serif;font-size:13px">---------------------</i></div><div style="font-family:Helvetica;font-size:18px;font-weight:normal;font-style:normal"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font color="#6666cc"><span style="font-family:Times"><span style="font-size:13px;font-family:Arial,sans-serif"><b>Laboratoire d'Energétique, d'Electronique et Procédés</b> <br><i>Unité de Recherche EA 4079</i> </span></span></font></span></span></span></span></span></div></div><span 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style="font-family:Helvetica;font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font color="#6666cc">Université de La Réunion, </font></span></span></span></span></span><span style="color:rgb(102,102,204)">LE2P</span></div><div style="font-family:Helvetica;font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font color="#6666cc">15 avenue René Cassin </font></span></span></span></span></span><span style="color:rgb(102,102,204)">CS 92003</span></div><div style="font-family:Helvetica;font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><font color="#6666cc">97744 ST DENIS CEDEX 9</font></span></span></span></span></span></div><div style="font-family:Helvetica;font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="border-collapse:separate"><font color="#6666cc">Mobile: </font><a href="mailto:secretariat.le2p@univ-reunion.fr" style="font-family:Arial,sans-serif;font-size:13px;color:rgb(224,101,24);text-decoration:none" target="_blank">0693 91 57 38</a><font color="#6666cc"><br><font face="Arial, sans-serif">Courriel:</font><font face="Arial, sans-serif"> </font></font><a href="mailto:secretariat.le2p@univ-reunion.fr" style="font-family:Arial,sans-serif;font-size:13px;color:rgb(224,101,24);text-decoration:none" target="_blank">chao.tang@univ-reunion.fr </a></span></div><div style="font-family:Helvetica;font-size:18px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><span style="border-collapse:separate"><i style="color:rgb(102,102,204);font-family:Arial,sans-serif;font-size:13px">--------------------------------------</i></span></span></span></span></span><i style="color:rgb(102,102,204);font-family:Arial,sans-serif;font-size:13px">--------------------------------------</i><i style="color:rgb(102,102,204);font-family:Arial,sans-serif;font-size:13px">---------------------</i></div></span></span></span></span></span></span></span></span></div></div></div></div>
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