Scheduled Downtime
On Friday 21 April 2023 @ 5pm MT, this website will be down for maintenance and expected to return online the morning of 24 April 2023 at the latest

Problem with SST_INPUT

This post was from a previous version of the WRF&MPAS-A Support Forum. New replies have been disabled and if you have follow up questions related to this post, then please start a new thread from the forum home page.

maR_Kus

New member
Hi All,

I am performing some simulations with WRF and I am able to complete the runs without any error. However, looking at the output I realized that SST_INPUT contains all constant zero-values, although I have correct values into wrflowinp_d01.
I am using these flags into the namelist to update the SSTs every 6 hours:

auxinput4_inname = "wrflowinp_d<domain>",
auxinput4_interval = 360,

sst_update = 1,
sst_skin = 1,

Looking at the rsl.out the model reads the file:

Input data is acceptable to use: wrflowinp_d01
Input data processed for aux input 4 for domain 1

Besides, the variable SST contains realistic time-varying SSTs as does SSTSK. Am I missing something here or the model can reproduce SSTs even if it does not read them correct? Otherwise could it be just an issue while writing data? I am facing this problem with both version 3.8.1 and 4.2.
Thank you in advance for anyone who could help me figure out what is going wrong!
Markus
 
Markus,

Would you please double check your wrflowinp file and make sure that SST is correct and time-varying?

If SST is correct, please remove the option sst_skin = 1, then rerun this case and let me know whether SST is reasonable in your wrfout file.
 
Hi Ming,
thanks for the quick reply.
I double checked the wrflowinp file and it has correct time-varying SSTs, as displayed in the attached figure.
I also re-ran the model with sst_skin = 0, but it does not fix the issue. Any other suggestions? The odd part is that SSTs from wrfout have realistic values, so I guess the models is reading/using them correctly.
 

Attachments

  • wrflowinp_SST.png
    wrflowinp_SST.png
    7.6 KB · Views: 997
I looked at the codes related to SST_INPUT. It turns out that this variable is only used when the compiling option key_cpp_oasis3 is turned on.
This option intends to hook WRF with OASIS ocean model. At present, we don't use this option.
This is why INPUT_SST is always zero. Please let me know if you have more questions.
 
Hi Ming,
I also ran the WRF simulation with the OISST data updating option, however when I run the wrf.exe program it got the error which is attached in the attachments:
WRF NUMBER OF TILES = 1
d02 2014-07-05_00:00:00 297 points exceeded cfl=2 in domain d02 at time 2014-07-05_00:00:00 hours
d02 2014-07-05_00:00:00 MAX AT i,j,k: 323 550 10 vert_cfl,w,d(eta)= 11555.64 2457077. 3.6130250E-02
d02 2014-07-05_00:00:00 2 points exceeded cfl=2 in domain d02 at time 2014-07-05_00:00:00 hours
d02 2014-07-05_00:00:00 MAX AT i,j,k: 183 397 6 vert_cfl,w,d(eta)= 2.125179 119.5028 1.8969357E-02
d02 2014-07-05_00:00:00 7 points exceeded cfl=2 in domain d02 at time 2014-07-05_00:00:00 hours
d02 2014-07-05_00:00:00 MAX AT i,j,k: 301 460 6 vert_cfl,w,d(eta)= 2.958751 163.8605 1.8969357E-02
Timing for main: time 2014-07-05_00:00:20 on domain 2: 45.42154 elapsed seconds
forrtl: severe (174): SIGSEGV, segmentation fault occurred
Image PC Routine Line Source
wrf.exe 000000000305879A for__signal_handl Unknown Unknown
libpthread-2.17.s 00002B8382D425D0 Unknown Unknown Unknown
wrf.exe 0000000002C31E41 Unknown Unknown Unknown
wrf.exe 0000000002C2D3B4 Unknown Unknown Unknown
wrf.exe 0000000002C2AFB3 Unknown Unknown Unknown
wrf.exe 00000000024BB5B0 Unknown Unknown Unknown
wrf.exe 0000000001CE8B5E Unknown Unknown Unknown
wrf.exe 0000000001487367 Unknown Unknown Unknown
wrf.exe 000000000129DC50 Unknown Unknown Unknown
wrf.exe 000000000056630F Unknown Unknown Unknown
wrf.exe 0000000000566926 Unknown Unknown Unknown
wrf.exe 00000000004160D1 Unknown Unknown Unknown
wrf.exe 000000000041608F Unknown Unknown Unknown
wrf.exe 0000000000416022 Unknown Unknown Unknown
libc-2.17.so 00002B8382F71495 __libc_start_main Unknown Unknown
wrf.exe 0000000000415F29 Unknown Unknown Unknown
Please help to address this problem.
Thank you in advance.
Bests,
Manh,
 

Attachments

  • namelist.input.txt
    4.7 KB · Views: 39
  • WRF.err.txt
    65.5 KB · Views: 32
CFL violation indicates the model became numerically unstable. If you turn off set_update, I suppose the model can run successfully. If so, this definitely indicates that your SST data is wrong. Please double check to make sure it is reasonable, and the landsea mask is correct.
 
Top