RIBX errror when running coupled model (WRFv4.1.1-CMAQv5.3.1)

WRF-CMAQ
1

Hi all,

When i was running two-way coupled model (WRFv4.1.1-CMAQv5.3.1) for January, Apri, July and October, my run aborted with the following error:

“-------------- FATAL CALLED ---------------
FATAL CALLED FROM FILE: LINE: 425
RIBX never exceeds RIC, RIB(i,kte) = NaN THETAV(i,1) = 290.1336 MOL= -280.1879 TCONV = NaN WST =
NaN KMIX = 2 UST = 7.6713055E-02 TST = -1.3038928E-03 U,V = 0.5312256 0.7183169 I,J= 11 68
-------------------------------------------”

For July and October, coupled model have successfully completed the whole month simulation without any error, but for the January and Apri the model run was aborted with above error. I also tried with a smaller time step (30,60,120 and 180), but the problem persists. I also changed the initial and boundary conditions from “NCEP FNL” data to “ECMWF" data, but the simulaiton still crashes afther 3-4 hours of simulation time.
And i am sure that all simulation were performed with same namelist.input at the same server.

I would appreciate any help on this issue.

Best wishes,
Zunyir

2

Hi,

Were you ever able to resolve this error? I am experiencing the same issue. My case ran half way through before suddenly stopping and giving me the same error message that RIBX never exceeds RIC. I am not sure how to resolve it. Any suggestions would be greatly appreciated.

Thanks

3

For anyone hoping to debug this error, there is not a single right way to fix it. Some people decreased the time step, some the grid size; another suggestion was to lower the guv, gt, and gq values. My problem was that I had grid_fdda = 1 but grid_sfdda = 0 so as soon as I turned sfdda on it ran all the way through.

Hope this proves helpful to anyone else who has problem. Best of luck.

2 Likes
4

hi
do you mean you used wrf obsgrid？

5

Yes, we run all our simulations with the PX LSM which requires OBSGRID

6

PX lsm seems like the lsm which the easiest crashed in wrf .
I think I find the solution in my case. I have 3 nest case (36 12 04 km)
I throught nesting in my case to get wrfbdy_d01 . And only use the wrfbdy_d01 to run the 36 12 04 case. 36 case can run suceesfully but 12 04 case can not. I got this error .
After I use ndown.exe to get more correct wrfbdy to 12 04km, I can sucessfully run 12 and 04case !
I think this is a “special” problem, especially for a user who only uses CMAQ but not wrf.

@wong.david-c

7

Hi bandaoshutiao,

Sorry for the late reply (just back from vacation last night). You are right that you need to have wrfbdy, wrffdda, wrfinput, wrflowinp, and wrfsfdda for each domain. CMAQ supports nesting but not in the same way as in WRF.

Cheers,
David