How to modify surface pressure and make it work

[jie_wong]

Hello,
I am trying to modify atmosphere pressure, and first, I want to modify surface pressure. So, I modify phys_state(chunk)%ps with my data. The figure below shows the output of the model compared with the output of the model without any modification(I add a low pressure in the beginning of day 2).
It was expected to work, but it didn't. First, other variables like u,v didn't change. Second, the PS in day 3 was the same as in the model with no modification.
So I am asking how to modify the pressure and make it stay and affect the atmosphere??

Thanks.

 

[rneale]

If you are running an initial simulation (not restart) then surface pressure (PS) is read in from the CAM initial file (.i. file). The full column pressure field is then a function of PS, height and the hybrid vertical coordinate grid values (hyam, hybm on the .i. field) for he particular vertical resolution you are using. Good luck.

 

[jie_wong]

Hello rneale,
I want to modify the surface pressure (PS) in a particular time, such as day 2, not in the begining. And I konw PS is put in phys_state(chunk)%ps, but it doesn't work when I modify it. So I am asking how to modify the PS while the model is running.

Thanks for help.