<div dir="ltr"><div>vinth2p uses one definition (Community Atmosphere Model) for hybrid levels. Specifically:<br><br> <i>p = a(k)*p0 + b(k)*ps</i>.
<br><br>ECMWF uses another:<br><br> <i>p = ap(k) + </i><i><i>b(k)*ps where </i>[ap(k)=a(k)*p0]</i><br><br></div><div>JMA (Japanese Meteorological Agency) uses a third method<br><br> p(k) = <a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/exp.shtml"><strong>exp</strong></a>( (1/dp(k))*(p(k-0.5)*<a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/log.shtml"><strong>log</strong></a>(p(k-0.5)) - p(k+0.5)*<a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/log.shtml"><strong>log</strong></a>(p(k+0.5))-1.0))<br><br></div><div>where the p(k-05) and p(k+0.5) represent the interface coefficients.</div><div><br></div>Hence, different coefficients. Try<br><div><br><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/vinth2p_ecmwf.shtml">http://www.ncl.ucar.edu/Document/Functions/Built-in/vinth2p_ecmwf.shtml</a><br><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 23, 2016 at 11:41 PM, WIND <span dir="ltr"><<a href="mailto:954051157@qq.com" target="_blank">954051157@qq.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span style="line-height:normal"><font face="Times New Roman" size="4">Hi all, </font></span><div><font face="Times New Roman" size="4"><span style="line-height:normal">I am trying to analyze the ERA-20C temperature tendency due to physics data</span><span style="line-height:normal">. My version is 6.2.1, </span><span style="line-height:30.6000003814697px;color:rgb(51,51,51)">now I have some doubts about the model levels. The website </span><a href="http://www.ecmwf.int/en/forecasts/documentation-and-support/60-model-levels" style="line-height:30.6000003814697px;outline:none;color:rgb(30,84,148)" target="_blank">http://www.ecmwf.int/en/forecasts/documentation-and-support/60-model-levels</a><span style="line-height:30.6000003814697px;color:rgb(51,51,51)"> </span><span style="line-height:30.6000003814697px;color:rgb(51,51,51)">gives the definations of 91 model levels. Should I use the </span></font><font face="Times New Roman" color="#333333" size="4"><span style="line-height:30.6000003814697px"><b>vinth2p </b></span></font><span style="color:rgb(51,51,51);line-height:30.6000003814697px;font-family:'Times New Roman';font-size:large">or other ways to transform from model data to pressure data? </span></div><div><div><div style="line-height:23.7999992370605px"><font face="Times New Roman" size="4"><span style="color:rgb(51,51,51)" lang="EN-US"><font style="line-height:30.6000003814697px">Look forward to your suggestions.</font></span><span style="line-height:normal"> Any help would be </span><span style="line-height:normal">appreciated.</span></font></div></div><div style="line-height:23.7999992370605px"><span style="line-height:normal"><font face="Times New Roman" size="4">Sincerely,</font></span></div><span style="line-height:normal"><font face="Times New Roman" size="4">Yan </font></span><span style="font-family:'lucida Grande',Verdana,'Microsoft YaHei';line-height:23.7999992370605px"></span></div><br>_______________________________________________<br>
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