<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Hi Abby,</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">This is always the challenge with tripole grids. Here is an example from a CICE run on the MOM6 tripole grid:</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><a href="http://webext.cgd.ucar.edu/MOM/bmom.e20.BMOM.f09_t061.long_run_mct.001/ice/bmom.e20.BMOM.f09_t061.long_run_mct.001-obs/yrs1-100/contour/con_ann_hi_cice.png">http://webext.cgd.ucar.edu/MOM/bmom.e20.BMOM.f09_t061.long_run_mct.001/ice/bmom.e20.BMOM.f09_t061.long_run_mct.001-obs/yrs1-100/contour/con_ann_hi_cice.png</a><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I always add 'res@gsnAddCycle = True' to all of my plots, but this doesn't quite cover the tripole zipper. The only way to do it is add an extra row at the northern edge of the domain.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Dave</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 19, 2019 at 9:39 AM Abigail Smith via ncl-talk <<a href="mailto:ncl-talk@ucar.edu">ncl-talk@ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi Dennis, </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Thanks for your quick response! And thank you for clarifying about the coordinate variables. </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">However, in the plot you attached there are large gaps in the Arctic Ocean. I realize that this is due to the shape of the grid, but using lat2d/lon2d seems to do a slightly better job of mapping data onto those areas, except for the gap passing through 90 degrees N (as seen in the original pdf that I attached). Do you know if there's a way to maximize the area that the data maps to, such that there are no gaps? </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Best,</div><div class="gmail_default" style="font-family:tahoma,sans-serif">Abigail </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 18, 2019 at 9:30 PM Dennis Shea <<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>float siconc(time, lat, lon)</div><div>where lat(lat) and lon(lon) are coordinate variables.</div><div>There is no need to use @lat2d, @lon2d</div><div><br></div><div>The original file was renamed when I downloaded:</div><div><br></div><div><a href="http://secure-web.cisco.com/1ul9UbLFj_X6lncl6JMMTi4Z0LU5goBypbouOMvqKAEissidSQKpjXLz-EwLcj3xMGAUbf7OK-l3t-klD4b2rnt1dNK-_zHMNcI5EbARZMGyYkxMwO9cwRwRB8YYP9NYvGkoyrRXsjo8gAXyO31V5cZp17lv3lLMtlrokhjzZPlWGN8md9hSOw3Wf7trO8o3kwOVEPJuXW77J3JsJ9-QSbco3QxsMKoZbg1n5Bwqwg7EaKVxpbsHjumHA-DgtzW_Wy3-64mGcPvfIvQekJLi7TxRVLrNpm9SBFYJU77LIZ2PX_OSg-WiXuXR-PJgw4TH7L6AtBQqC9tpytJAzU11iwKARvBOeR-z_qZKlrUJZ9Dn3-sVi3cAQrJksvjuzR_8b1RqgPEZnA2aC6AbdMqwkWaPNx97aX3ae0ajtBHKPphzDfS_qg9oQ0TK62DC864Xg/http%3A%2F%2Ftest.siconc_SIday_BCC-CSM2-MR.nc" target="_blank">test.siconc_SIday_BCC-CSM2-MR.nc</a> <== siconc_SIday_BCC-CSM2-MR_historical_r1i1p1f1_gn_19000101-19091231.nc</div><div>===</div><div>Variable: sic<br>Type: float<br>Total Size: 121939200 bytes<br> 30484800 values<br>Number of Dimensions: 3<br>Dimensions and sizes: <b>[time | 365] x [lat | 232] x [lon | 360]</b><br>Coordinates: <br> time: [ 0.5..364.5]<br> <b> lat: [-81.5..89.5] <== coordinate variable<br> lon: [ 0.5..359.5] <b><== coordinate variable</b></b><br>Number Of Attributes: 11<br> standard_name : sea_ice_area_fraction<br> long_name : Sea Ice Area Fraction (Ocean Grid)<br> comment : Area fraction of grid cell covered by sea ice<br> <b>units : %</b><br> original_name : CN<br> cell_methods : area: mean where sea time: mean<br> cell_measures : area: areacello<br> history : 2018-11-27T09:03:20Z altered by CMOR: Treated scalar dimension: 'type'.<br> coordinates : type latitude longitude<br> missing_value : 1e+20<br> _FillValue : 1e+20</div><div><br></div><div><br></div><div>See attached:</div><div><br></div><div><b>%> ncl</b> siconc.ncl</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 18, 2019 at 2:00 PM Abigail Smith via ncl-talk <<a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Hi NCL-talk,<br><br>I'm attempting to create polar stereographic contour plots of Arctic sea ice from various CMIP models on their native grids. Some of the grids are tripole, so I end up having the same gap as seen in ice_4.ncl at <a href="https://www.ncl.ucar.edu/Applications/orca.shtml" target="_blank">https://www.ncl.ucar.edu/Applications/orca.shtml</a>. I want to remove the gap, but the solution in ice_4.ncl uses U-fold grid coordinates, which aren't provided for many CMIP models. <br><br>I've attached an example script and the plot it produces. The data are available for download here:<br><a href="https://secure-web.cisco.com/1yJctVysxmtw-Ey_-bTATuatmIfgwB_PPX3DpPQbX966Md4RBVe5Og6JJoKylyKORLv3UywkR6yJay4Uu1hsNPoRfDs4ye7bjONPTKDvuhHiNPaKg2HL1Mn5YV8QjpmQWiHKNT7ZzX5dzGQELsJHuupS6TipNVI7-Y6ksQfzlBw_swbE6N4nu15LKyLloKESepVNAuyYsw24x5__PuDAegxI3aPUT74MGoPraBGT9MMXwUM8YXV9r7aW_0dIkNM8QM_Kt4wSA_9aomjcdRY4ts4W2cWopqO0dnC5Lnn0dQ3iv2i_I2g08x75rzcTf6E8XmuvOXcSJADU-J92vZMxS9Ap1ZNCFu6AxmBRAsJ5aeJclzvolz_yVnsgvGmzL1Sr1cOoQMWAJMF9PWnUYdsO4znxrVkFD-KEOjyh9V70jiw-FI4zRdIOS46KR6xmWtaz1igTiJYFnWkiBOGqPUsUhRw/https%3A%2F%2Fhandle-esgf.dkrz.de%2Flp%2F21.14100%2Fc55636b2-3c1a-4735-8243-4e62310acbc3" target="_blank">https://handle-esgf.dkrz.de/lp/21.14100/c55636b2-3c1a-4735-8243-4e62310acbc3</a> <br>I'm running ncl version 6.3.0 and not getting any error messages. <br><br>Thanks in advance for considering this issue!<br><br>Best,<br>Abigail Smith <br>University of Colorado Boulder<br></div></div>
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<p>David A Bailey email: <a href="http://dbailey_at_ucar.edu" target="_blank">dbailey_at_ucar.edu</a><br>National Center for Atmospheric Research phone: 303-497-1737<br>PO Box 3000 fax : 303-497-1700<br>Boulder, CO 80307-3000<br> <a href="http://www.cgd.ucar.edu/staff/dbailey" target="_blank">http://www.cgd.ucar.edu/staff/dbailey</a></p></div></div></div></div>