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Correct interior tendency alt_co2 pH bounds #488

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Merged
mnlevy1981 merged 1 commit into from
May 19, 2026
Merged

Correct interior tendency alt_co2 pH bounds #488

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11 changes: 6 additions & 5 deletions src/marbl_interior_tendency_mod.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -1122,16 +1122,17 @@ subroutine compute_carbonate_chemistry(domain, temperature, press_bar, &
call marbl_status_log%log_warning_trace('marbl_co2calc_interior() with dic', subname)
end if

ph_prev_col = ph

do k=1,dkm
ph_prev_col(k) = pH(k)
if (ph_prev_alt_co2_col(k) /= c0) then
if (domain%delta_z(k) > 1._r8 * unit_system%cm2len) then
ph_lower_bound(k) = ph_prev_col(k) - del_ph
ph_upper_bound(k) = ph_prev_col(k) + del_ph
ph_lower_bound(k) = ph_prev_alt_co2_col(k) - del_ph
ph_upper_bound(k) = ph_prev_alt_co2_col(k) + del_ph
else
! Double initial bracket width for very thin layers
ph_lower_bound(k) = ph_prev_col(k) - 2._r8 * del_ph
ph_upper_bound(k) = ph_prev_col(k) + 2._r8 * del_ph
ph_lower_bound(k) = ph_prev_alt_co2_col(k) - 2._r8 * del_ph
ph_upper_bound(k) = ph_prev_alt_co2_col(k) + 2._r8 * del_ph
end if
else
ph_lower_bound(k) = phlo_3d_init
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