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added configuration with nitrous oxide #166

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Merged
glessin merged 5 commits into from
May 19, 2026
Merged

added configuration with nitrous oxide #166

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7c5ee5e
added configuration with nitrous oxide
glessin Apr 30, 2026
e7cbfec
rearranged order of modules
glessin Apr 30, 2026
60c802c
added Wanninkhof 2014 option for nitrous oxide
glessin Apr 30, 2026
fd66bbf
added quartic term to W2014 Sc calculation
glessin May 8, 2026
bca1d0e
added temperature range warnings for N2O Sc number
glessin May 8, 2026
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16 changes: 11 additions & 5 deletions src/nitrous_oxide.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ module ersem_nitrous_oxide
type (type_horizontal_diagnostic_variable_id) :: id_airsea
type (type_diagnostic_variable_id) :: id_satp

integer :: iswN2O
integer :: iswN2O, iswASFLUX

contains
! Model procedures
Expand Down Expand Up @@ -60,7 +60,7 @@ subroutine initialize(self,configunit)
call self%register_diagnostic_variable(self%id_satp,'satp','%','nitrous oxide % saturation')
call self%register_diagnostic_variable(self%id_airsea,'airsea','mmol N2O/m^2/d','airsea flux of N2O',source=source_do_surface)
call self%get_parameter(self%iswN2O,'iswN2O','','air-sea flux switch (0: off, 1: on)',default=1,minimum=0,maximum=1)

call self%get_parameter(self%iswASFLUX, 'iswASFLUX','','air-sea N2O exchange (1: Wanninkhof, 1992; 2: Wanninkhof, 2014)', default = 1, minimum = 1, maximum = 2)
end subroutine initialize

subroutine do(self,_ARGUMENTS_DO_)
Expand Down Expand Up @@ -96,10 +96,16 @@ subroutine do_surface(self,_ARGUMENTS_DO_SURFACE_)
_GET_HORIZONTAL_(self%id_wnd,wnd)
_GET_HORIZONTAL_(self%id_pN2Oa,pN2Oa)

! Schmidt number for N2O (Wanninkhof, 1992)

sc=2301._rk-151._rk*ETW+4.74_rk*ETW**2._rk-0.06_rk*ETW**3
if (self%iswASFLUX .eq. 1) then
! Schmidt number for N2O (Wanninkhof, 1992 - should not be used outside 0 to 30 degC temperature range)
sc=2301._rk-151._rk*ETW+4.74_rk*ETW**2._rk-0.06_rk*ETW**3._rk
fwind = 0.39_rk * wnd**2 *(sc/660._rk)**(-0.5_rk)
elseif (self%iswASFLUX .eq. 2) then
! Schmidt number for N2O (Wanninkhof, 2014 - for temperatures within the range of -2 to 40 degC)
sc=2356.2_rk-166.38_rk*ETW+6.3952_rk*ETW**2._rk-0.13422_rk*ETW**3._rk + 0.0011506_rk*ETW**4._rk
fwind = 0.251_rk * wnd**2 *(sc/660._rk)**(-0.5_rk)
endif

fwind=fwind*24._rk/100._rk ! convert to m/day

koN2O = n2o_transfer_coefficient(self,ETW,X1X)
Expand Down
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