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Added the MEKE_POSITIVE parameter to enforce MEKE to be positive #923

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Added the MEKE_POSITIVE parameter to enforce MEKE to be positive #923

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10 changes: 10 additions & 0 deletions src/parameterizations/lateral/MOM_MEKE.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,7 @@ module MOM_MEKE
integer :: eke_src !< Enum specifying whether EKE is stepped forward prognostically (default),
!! read in from a file, or inferred via a neural network
logical :: sqg_use_MEKE !< If True, use MEKE%Le for the SQG vertical structure.
logical :: MEKE_positive !< If True, apply a lower bound 0.0 to MEKE
type(diag_ctrl), pointer :: diag => NULL() !< A type that regulates diagnostics output
!>@{ Diagnostic handles
integer :: id_MEKE = -1, id_Ue = -1, id_Kh = -1, id_src = -1
Expand Down Expand Up @@ -701,6 +702,12 @@ subroutine step_forward_MEKE(MEKE, h, SN_u, SN_v, visc, dt, G, GV, US, CS, hu, h
enddo ; enddo
endif ! MEKE_KH>=0

if (CS%MEKE_positive) then
do j=js,je ; do i=is,ie
MEKE%MEKE(i,j) = max(0.0, MEKE%MEKE(i,j))
enddo ; enddo
endif

if (CS%debug) then
call hchksum(MEKE%MEKE, "MEKE post-update MEKE", G%HI, haloshift=0, unscale=US%L_T_to_m_s**2)
endif
Expand Down Expand Up @@ -1437,6 +1444,9 @@ logical function MEKE_init(Time, G, GV, US, param_file, diag, dbcomms_CS, CS, ME
call get_param(param_file, mdl, "SQG_USE_MEKE", CS%sqg_use_MEKE, &
"If true, the eddy scale of MEKE is used for the SQG vertical structure ",&
default=.false.)
call get_param(param_file, mdl, "MEKE_POSITIVE", CS%MEKE_positive, &
"If true, apply a lower bound 0.0 to MEKE. ",&
default=.false.)

! Nonlocal module parameters
call get_param(param_file, mdl, "CDRAG", cdrag, &
Expand Down
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