Total number of obs=0 in da_wrfvar.exe

[Haoyue_Tang]

Hi everyone,

I'm recently running WRFDA trying to assimilate our surface wind observation and Wind LiDAR data to the simulation. I generated ob.ascii successfully but when I try to run da_wrfvar.exe it always tells me no observation being read, analysis field=0 and Jo=0 in the end. I try to adjust the field records/ qc flags in ob.ascii, checked the time window, adjusted my WRF e_vert to 43 to match the default be.dat.cv3, but none of them works. I also tried check_max_iv = .false. but all the observation still been read and rejected without any extra information(check_max_iv result is empty, no used/rej info as in the tutorial).

I’ve attached the full log from da_wrfvar.exe and my namelist setup for your review. Any suggestions about what to look for next, or potential causes I might be missing would be greatly appreciated. Thanks in advance for your time and help.

Best regards,
Haoyue

 

[Haoyue_Tang]

I find the problem might be that the HEIGHT record should be ASL instead of AGL.

I'm still not sure how it's been defined. It's not pointed out in the documentation about the definition of HEIGHT and ELEVATION. I thought ELEVATION is the terrain height above sea level where obs station is located, and HEIGHT is station height above terrain height, so HEIGHT+ELEVATION = obs height above sea level, but it doesn't work. However, the record which ELEVATION=HEIGHT=obs height above sea level works.

I'm still confused. It would be nice if any one herecould confirm if this interpretation is correct?