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SPOOKIE experiment with CAM5 physics

V

v2dixit@rediffmail_com

New Member
Dear all,I am trying to setup CAM5 for SPOOKIE experiment where both shallow and deep convection are set OFF. More details about the SPOOKIE are described,= here https://ore.exeter.ac.uk/repository/handle/10871/32057. Here shallow and deep convection were set OFF in CAM5.While the deep convection can be set off by setting "deep_scheme = 'off' " in the user_nl_cam file that lists user defined namelist changes.A similar strategy for shallow convection scheme (shallow_scheme = 'off') does not work though. How can I set shallow scheme (UW shallow convection scheme) OFF in CAM5 ?I get the following error:(shr_sys_abort) ERROR: phys_setopts: illegal value of shallow_scheme
 phys_setopts: illegal value of shallow_scheme:off            Thanks,Vishal
 
B

brianpm

Active Member
Vishal,I think that one way to "turn off" the UW shallow convection is to modify compute_uwshcu so that the parameter kinv = 1. You can find the relevant code around lines 1452-1465 in uwshcu.F90 (in CESM 1.2.0, at least).I think you can just comment out the loop that diagnoses kinv: 
Code: 
 

Code: 
!       do k = mkx - 1, 1, -1

Code: 
!          if( (pblh + 5._r8 - zs0(k))*(pblh + 5._r8 - zs0(k+1)) .lt. 0._r8 ) then

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!               kinv = k + 1

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!               go to 15

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!          endif

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!      end do

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       kinv = 1

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! 15     continue

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       if( kinv .le. 1 ) then

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           exit_kinv1(i) = 1._r8

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           id_exit = .true.

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           go to 333

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       endif<br /><br />That should effectively shut off shallow convection. <br /><br />Also, be sure to check that deep_scheme = 'off' is actually working the way you want. I know that when the UW folks did SPOOKIE, they did not use that option, but just changed the threshold for deep convection to be some very large number.<br /><br />Good luck.
 
B

brianpm

Active Member
Vishal,I think that one way to "turn off" the UW shallow convection is to modify compute_uwshcu so that the parameter kinv = 1. You can find the relevant code around lines 1452-1465 in uwshcu.F90 (in CESM 1.2.0, at least).I think you can just comment out the loop that diagnoses kinv: 
Code: 
 

Code: 
!       do k = mkx - 1, 1, -1

Code: 
!          if( (pblh + 5._r8 - zs0(k))*(pblh + 5._r8 - zs0(k+1)) .lt. 0._r8 ) then

Code: 
!               kinv = k + 1

Code: 
!               go to 15

Code: 
!          endif

Code: 
!      end do

Code: 
       kinv = 1

Code: 
! 15     continue

Code: 
 

Code: 
       if( kinv .le. 1 ) then

Code: 
           exit_kinv1(i) = 1._r8

Code: 
           id_exit = .true.

Code: 
           go to 333

Code: 
       endif<br /><br />That should effectively shut off shallow convection. <br /><br />Also, be sure to check that deep_scheme = 'off' is actually working the way you want. I know that when the UW folks did SPOOKIE, they did not use that option, but just changed the threshold for deep convection to be some very large number.<br /><br />Good luck.
 
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