[Wrf-users] Vtable update for new GFS data

Tue Nov 11 07:44:14 MST 2014

The GFS data files will be updated next month probably around 17 December 2014, with changes to the filenames and the addition of 0.25-degree-resolution data.  See http://www.nws.noaa.gov/om/notification/tin14-46gfs.htm for the announcement.  Most importantly for WRF users, the soil temperature representation within the grib2 file is being changed.  From the announcement:

Rename TMP at 0-0.1 m, 0.1-0.4 m, 0.4-1.0 m, and 1-2 m to the more accurate name of Soil Temperature (TSOIL)

This will require a change to the Vtable.GFS file for the ungrib program to pick up the renamed fields.  Based on testing of the parallel data that is currently being posted, here are the changes to the Vtable.GFS that you need to make:

>From the current Vtable.GFS .....
11 | 112  |   0  |  10  | ST000010 | K       | T 0-10 cm below ground layer (Upper)    |  0  |  0  |  0  | 106 |
11 | 112  |  10  |  40  | ST010040 | K       | T 10-40 cm below ground layer (Upper)   |  0  |  0  |  0  | 106 |
11 | 112  |  40  | 100  | ST040100 | K       | T 40-100 cm below ground layer (Upper)  |  0  |  0  |  0  | 106 |
11 | 112  | 100  | 200  | ST100200 | K       | T 100-200 cm below ground layer (Bottom)|  0  |  0  |  0  | 106 |
11 | 112  |  10  | 200  | ST010200 | K       | T 10-200 cm below ground layer (Bottom) |  0  |  0  |  0  | 106 |

The updated Vtable.GFS lines....
11 | 112  |   0  |  10  | ST000010 | K       | T 0-10 cm below ground layer (Upper)    |  2  |  0  |  2  | 106 |
11 | 112  |  10  |  40  | ST010040 | K       | T 10-40 cm below ground layer (Upper)   |  2  |  0  |  2  | 106 |
11 | 112  |  40  | 100  | ST040100 | K       | T 40-100 cm below ground layer (Upper)  |  2  |  0  |  2  | 106 |
11 | 112  | 100  | 200  | ST100200 | K       | T 100-200 cm below ground layer (Bottom)|  2  |  0  |  2  | 106 |
11 | 112  |  10  | 200  | ST010200 | K       | T 10-200 cm below ground layer (Bottom) |  0  |  0  |  2  | 106 |

The other lines in the should remain the same.

I've made a single test run with the new Vtable that appeared to complete successfully.  Without this change, ungrib does not pick up the soil temperature and your WRF job may fail.  Further testing by users is certainly called for using the parallel data being posted by NCEP before the new data goes operational next month.

Stephen Masters
Senior Staff Scientist
masters.steve at ensco.com
321-775-7548 (o)
321-254-3293 (f)
4849 North Wickham Road
Melbourne, FL 32940
www.ensco.com<http://www.ensco.com/>

[cid:image001.gif at 01CFFD8F.D3B6FFD0]
Innovation. Collaboration. Solutions. Success.

________________________________
The information contained in this email message is intended only for the use of the individual(s) to whom it is addressed and may contain information that is privileged and sensitive. If you are not the intended recipient, or otherwise have received this communication in error, please notify the sender immediately by email at the above referenced address and note that any further dissemination, distribution or copying of this communication is strictly prohibited.

The U.S. Export Control Laws regulate the export and re-export of technology originating in the United States. This includes the electronic transmission of information and software to foreign countries and to certain foreign nationals. Recipient agrees to abide by these laws and their regulations -- including the U.S. Department of Commerce Export Administration Regulations and the U.S. Department of State International Traffic in Arms Regulations -- and not to transfer, by electronic transmission or otherwise, any content derived from this email to either a foreign national or a foreign destination in violation of such laws.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/wrf-users/attachments/20141111/414d3912/attachment.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.gif
Type: image/gif
Size: 2303 bytes
Desc: image001.gif
Url : http://mailman.ucar.edu/pipermail/wrf-users/attachments/20141111/414d3912/attachment.gif 