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WRF 3.8.1 Simulation Issue with Water Vapor Tracer (WVT) Tool

Hu Li

New member
Greetings! We have encountered issues while using the WRF version3.8.1 to simulate the Qinghai-Tibet Plateau region. We have embedded the water vapor tracer (WVT) tool developed by Insua-Costa & Miguez-Macho (2018) in the WRF 3.8.1 version. We used ERA5 reanalysis data as the initial field. We have faced problems during the simulation in winter months (December, January, and February), while there were no issues in the simulation for the remaining months. The problem occurs when we enable the WVT tool, and the error message we received is "forrtl: severe (174): SIGSEGV, segmentation fault occurred".

It is worth mentioning that when we disable the WVT water vapor tracer tool, the simulation runs smoothly without any issues.

We have attempted several troubleshooting methods, but none of them have been successful. These methods include:

1. Reducing the time step, we have tried integration time steps of 150, 125, 100, 75, and 50.

2. Adding "smooth_cg_topo = .true" in the "&domains" section of the namelist.input file.

3. Setting "epssm = 0.2" (maximum 0.5) to suppress three-dimensional divergence.

4. Setting "w_damping = 1".

5. Considering memory issues by setting "ulimit -s unlimited".

Despite trying the above methods, we are still encountering the same error. We would like to seek your advice on how to resolve this issue. We have attached the namelist.input file and the error file for your reference. We appreciate your assistance.

Thank you!


  • namelist.input
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  • rsl.error.0000
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The WVT is not a tool that was developed or supported by our group here at NCAR, so unfortunately we aren't able to help with that. I would recommend trying to contact one of the developers, or see if there is another group using the tool that may have some advice.