[ncl-talk] Question about PopLatLon: reamp regular lat-lon grid to POP grid

[Yuntao BAO]

Dear NCL-talk,

I use PopLatLon function to remap SST with a regular 1x1 lat/lon grid to a POP grid. To perform the remapping, I use the POP weight file "map_1x1d_to_gx1v6_bilin_da_100716.nc" downloaded from

https://svn-ccsm-inputdata.cgd.ucar.edu/trunk/ncl/





I successfully get the result, the new SST with a gx1v6 POP grid. But the problem is that the new SST data has many unrealistic values in most of the continental margin (shown in Fig. b), these values are much less than it should be.

I don't know what may cause this problem. Do you have any idea about what may cause this problem? I think maybe the POP weight file accounts.



The remapping results of the example lat2pop_1.ncl on NCL webpage has no such problem. This example used a different POP weight file "map_1x1d_to_gx1v3_bilin_da_010808.nc". I tried to download this weight file, but I can't find it anywhere. Could you please guide me to the location of this former POP weight file "map_1x1d_to_gx1v3_bilin_da_010808.nc" ?



I would appreciate if you can help! Looking forward to your reply!

Best regards,

Yuntao Bao



Appendix:

This is the link of the example lat2pop_1.ncl:

https://www.ncl.ucar.edu/Applications/Scripts/lat2pop_1.ncl


These are the plots before and after remapping:

[cid:image001.png at 01D644D8.225440E0]
Fig. (a) SST in a regular 1x1 lat/lon grid


[cid:image002.png at 01D644D8.225440E0]
Fig. (b) SST in a gx1v6 POP grid


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.ucar.edu/pipermail/ncl-talk/attachments/20200617/679e0e09/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 230917 bytes
Desc: image001.png
URL: <https://mailman.ucar.edu/pipermail/ncl-talk/attachments/20200617/679e0e09/attachment-0002.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 290235 bytes
Desc: image002.png
URL: <https://mailman.ucar.edu/pipermail/ncl-talk/attachments/20200617/679e0e09/attachment-0003.png>