Help with WRFDA

[ashish__shaji]

Hi,

I am a beginner at running wrfda. I used wrfda online tutorial and run its test case successfully. I have also gone through the user guide, but I was not understanding most of it. Now, I want to run a real case of wrf data assimilation. Could you please help and give me a user guide or tutorial with all the details and stages of running wrfda for running real cases, including making background error files (be.dat), conversion of observation into assimilation supported format, etc.? Can anyone guide me through this?

Thank you in advance,

 

[JeremyB]

Hello ashish_shaji,

This seems to be a recurring theme (I've had many requests for this). I may put together a video tutorial or document with this. As for making the background error files, that's something I'm still learning how to do. Also, for conversion of the observations into data assimilation, it also depends on what data you are trying to assimilate. I can convert RAWS station data into little r format, but I have no clue how to do sounding data. If I get around to making this document I will let you know. Most of the real cases is similar to how you run WRF. All you do is setup everything the same and get your wrfinput files, then when you have those files, link them to fg, process your observations, then run da_wrfvar.exe. I'm sorry I'm not more helpful with this, but when I get more time I can try to help some more.

Thanks,
Jeremy B

 

[ashish__shaji]

Thanks, Jeremy, for your reply. I'm also learning how to do these things. If I understand/ learn them properly, I'll also let you know.

Thanks,
Ashish Shaji

 

[CalmTide]

I feel this is my case, I want to assimilate GPS ZTD, and the whole of thing about little_r formatting is just confusing. Can I get help on which file to use or format to litte_r and how I will go about it.

Thanks

 

[JeremyB]

I feel this is my case, I want to assimilate GPS ZTD, and the whole of thing about little_r formatting is just confusing. Can I get help on which file to use or format to litte_r and how I will go about it.

Thanks

Hello,

Unfortunately the best advice I can give is to write a script to do it. I had some help from AI with the code and after some adjusting it worked. I would setup a very small case and use your observations. When you go to run obsproc, put it in a log files (./obsproc.exe >& test.log &) and check the errors in that log file. It took me some time to get my observations perfect.

Thanks,
JeremyB

 

[CalmTide]

Ok, JeremyB.
I would appreciate such guidance so much. And I will definitely wait for the demonstration.
Thank you very much, Sir