UPPV2.x - Total Cloud Cover from WRF-ARW is bad

Questions relating to the use of the WRF Post Processor V3

UPPV2.x - Total Cloud Cover from WRF-ARW is bad

Postby oib » Thu Oct 23, 2014 5:26 am

Hi all,

I'm processing WRF ARW netcdf output files with unipost.exe, compiled with option "Linux x86_64, Intel compiler (dmpar)".

I run unipost with the command:

mpiexec -n N unipost.exe

When N > 1 the resulting 3d field Total Cloud Cover [%] looks wrong.

In particular a 2d plot onto a fixed z lelel looks like segmented into horizontal bands.

The problem disappear if I run with N = 1.

On my system the problem affect all the version UPPV2.0, UPPV2.1, UPPV2.2 coupled with WRFV3.4.x, WRFV3.5.x, WRFV3.6.x.

My system has two Intel Xeon CPU, Centos 6.5 x86_64.

On my system Hyper-Threading is disabled.

WPS - WRF (ARW) - UPP was compiled with Intel Compilers:

Intel(R) Fortran Compiler XE 14.0 Update 3 for Linux
Intel(R) C++ Compiler XE 14.0 Update 3 for Linux

And with the following libraries:

mpich-3.1.2
netcdf-4.1.1 (I have tried also 3.6.3)
zlib-1.2.8 (I have also tried 1.2.3)
libpng-1.6.10 (I have also tried 1.5.51)
jasper-1.900.1

The following GrADS plots are from GRIB files produced by UPP from an ARW run (4Km grid size, Lambert projection) and I think these may explain the problem better than my description.

mpiexec -n 2 unipost.exe
Image

mpiexec -n 12 unipost.exe
Image

The cloud cover grid looks like segmented in N (= number of used cores) horizontal tiles.

Have you any suggestion that could help me resolving this?

Best regards.
oib
 
Posts: 2
Joined: Tue Aug 26, 2014 4:05 am

Re: UPPV2.x - Total Cloud Cover from WRF-ARW is bad

Postby adprest » Fri Jun 24, 2016 11:45 pm

Did you ever figure out what the problem was? I am experiencing similar problems with one of my WRF-Chem fields. My grid also looks like it's segmented in N (= number of used cores) horizontal tiles.

I look forward to hearing how you resolved this!

Thanks,
Ari
adprest
 
Posts: 16
Joined: Tue Mar 04, 2014 1:51 pm
Location: Florida State University


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