WRFDA does not update the values of diagnostic variable: 10-m wind speed

[JackGong]

Have a nice day! Everyone. I have one question/problem:

I found that, after assimilation, the values of 10-m wind variable are unchanged. For example, I assimilated (using 3DVAR method, WRFDA 4.2 version) the data to update wrfinput_d02 file, then I get an updated wrfinput_d02 file. I found the values of 10-m wind speed in original wrfinput_d02 and new wrfinput_02 are the same. However, other variables, such as the values of U and V wind components at different pressure levels, have been changed.

This means that the diagnostic variable 10-m wind speed has not been changed after assimilation. How can I investigate the assimilation impact on 10-m wind background field?

Thank you all very much.

 

[mnas]

I think the normal behavior of WRFDA is to update only the prognostic variables. You can investigate the impact of lower-level wind or run a forecast to observe the changes in all diagnostic variables in the forward time steps.

 

[mnas]

UPDATE From the User's guide: in namelist.input/&wrfvar1 there is the variable update_sfc_diag. If set true, update T2/Q2/U10/V10/TH2 with WRFDA re-diagnosed values. Use only with sf_sfclay_physics=91 in WRF