<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Jennifer,<div><br></div><div>I can offer some assistance with respect to GFDL's gridspec files. The angles were published for the supergrid, which is twice the resolution of the actual grid.</div><div><br></div><div>The points in the supergrid corresponding to the actual grid are: nxp={2,4,...360}, nyp={2,4,6,…200}.</div><div><br></div><div>Sorry this information wasn't recorded anywhere. We'll likely republish these files on the actual grid in the near future.</div><div><br></div><div>Thanks,</div><div>Kyle</div><div><br></div><div><div><div>On Jul 23, 2012, at 1:39 PM, Jennifer Adams wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi, Everyone -- <div>I have downloaded the transix and transiy variables for the historical experiment (realm=seaIce,frequency=mon,MIP=OImon) for the following models:</div><div><br></div><div><div>CMCC.CMCC-CM/</div><div>CMCC.CMCC-CMS/</div><div>CNRM-CERFACS.CNRM-CM5/</div><div>CSIRO-BOM.ACCESS1-0/</div><div>CSIRO-BOM.ACCESS1-3/</div><div>CSIRO-QCCCE.CSIRO-Mk3-6-0/</div><div>INM.inmcm4/</div><div>IPSL.IPSL-CM5A-LR/</div><div>IPSL.IPSL-CM5A-MR/</div><div>IPSL.IPSL-CM5B-LR/</div><div>MIROC.MIROC4h/</div><div>MIROC.MIROC5/</div><div>MIROC.MIROC-ESM/</div><div>MIROC.MIROC-ESM-CHEM/</div><div>MPI-M.MPI-ESM-LR/</div><div>MPI-M.MPI-ESM-MR/</div><div>MPI-M.MPI-ESM-P/</div><div>MRI.MRI-CGCM3/</div><div>NASA-GISS.GISS-E2-H/</div><div>NASA-GISS.GISS-E2-R/</div><div>NASA-GISS.GISS-E2-R-CC/</div><div>NCC.NorESM1-M/</div><div>NCC.NorESM1-ME/</div><div>NOAA-GFDL.GFDL-CM3/</div><div>NOAA-GFDL.GFDL-ESM2G/</div><div>NOAA-GFDL.GFDL-ESM2M/</div></div><div><br></div><div>The vector components transix and transiy are grid relative, and in order to display them properly, I need to rotate them to earth-relative coordinates. On page 10 of the document titled "CMIP5 Model Output Requirements: File Contents and Format, Data Structure and Metadata" , it says: "… <font class="Apple-style-span" color="#ff2a1a">for grids other than Cartesian latitude-longitude grids, a file recording all the grid configuration information called for by gridpsec must be created for each modeling realm</font>…" The name of this gridspec file is provided in the global attribute named associated_files in all data files. Unfortunately, as far as I can tell by searching with P2P, the gridspec files have not been published by any institute except GFDL. </div><div><br></div><div>I have grabbed all the GFDL gridspec files that are available via ESGF. Here is the relevant output from ncdump on one that matches my data, "gridspec_seaIce_fx_GFDL-CM3_historical_r0i0p0.nc" :</div><div><div><br></div><div>dimensions:</div><div> nxp = 721 ;</div><div> nyp = 401 ;</div><div>variables:</div><div> double angle_dx(nyp, nxp) ;</div><div> angle_dx:standard_name = "grid_vertex_x_angle_WRT_geographic_east" ;</div><div> angle_dx:units = "degrees_east" ;</div><div><br></div><div>There is the variable I desire, angle_dx, but it is on a 721x401 grid. </div></div><div>The native grid of the data file transix_OImon_GFDL-CM3_historical_r1i1p1_186001-186412.nc is 360x200. </div><div>I cannot use the angle_dx variable in this gridspec file because it doesn't match the data. </div><div><br></div><div>Here are my questions: Do accurate gridspec files exist? How can I acquire them? </div><div><br></div><div>--Jennifer</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><div apple-content-edited="true">
<span class="Apple-style-span" style="font-size: 12px; "><div>--</div><div>Jennifer M. Adams</div><div>IGES/COLA</div><div>4041 Powder Mill Road, Suite 302</div><div>Calverton, MD 20705</div><div><a href="mailto:jma@cola.iges.org">jma@cola.iges.org</a></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span>
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