Questions about nudging [U V T Q] in CESM2.2

[Zhu Zhu]

Hi all,
I am trying a nudging test in CESM2.2 with B1850 compset. The user_nl_cam is attached bellow. I want to nudging U and V in [30-70°N,140°E-90°W] at lower troposphere. The output of Lookat_NudgeWindow tool looks right:



In user_nl_cam, I added 'Nudge_U', 'Nudge_V', 'Nudge_T' and 'Nudge_Q' to hourly output. The 'Nudge_T' and 'Nudge_Q' is all zero because Nudge_Tcoef and Nudge_Qcoef were set to 0.0. However, the 'Nudge_U' and 'Nudge_V' have values at all level worldwide:

This confused me a lot, I think 'Nudge_U' and 'Nudge_V' should be zero at blue region showed in horizontal.png. Is there anything wrong in my user_nl_cam? Any advice would be helpful. Thanks very much!

 

[Zhu Zhu]

Sorry, horizontal.png is this figure:

 

[islas]

I think you need to set Nudge_Uprof and Nudge_Vprof to 2, not 1. If you set it to 1, it's doing uniform nudging but if you set it to 2, it's doing the window nudging.