!====================== include file "npzd.h" =========================

!   variables for npzd model

!   ntnpzd   = number of npzd tracers
!   nbio     = number of npzd timesteps per ocean timestep
!   trcmin   = minimum tracer for flux calculations
!   alpha    = initial slope P-I curve [(W/m^2)^(-1)/day]
!   kw       = light attenuation due to water [1/m]
!   kc       = light attenuation by phytoplankton [1/(m*mmol m-3)]
!   ki       = light attenuation through sea ice & snow
!   abio     = maximum growth rate parameter [1/day]
!   bbio     = b
!   cbio     = [1/deg_C]
!   k1n      = half saturation constant for N uptake [mmol m-3]
!   nup      = specific mortality rate (Phytoplankton) [day-1]
!   gamma1   = assimilation efficiency (zpk)
!   gbio     = maximum grazing rate [da-1y]
!   epsbio   = prey capture rate [(mmol m-3)-2 day-1]
!   nuz      = quadratic mortality (zpk)
!   gamma2   = excretion (zpk)
!   nud0     = remineralization rate [day-1]
!   LFe      = Iron limitation
!   wd       = sinking speed of detritus [m day-1]
!   ztt      = depth to top of grid cell [cm]
!   rkwz     = reciprical of light attenuation times grid depth
!   par      = fraction of photosythetically active radiation
!   dtnpzd   = time step of biology
!   capr     = carbonate to carbon production ratio
!   dcaco3   = remineralisation depth of calcite [cm]
!   rcak     = array used in calculating calcite remineralization
!   rcab     = array used in calculating bottom calcite remineralization
!   nupt0    = specific mortality rate (Phytoplankton) [1/day]
!   wd0      = sinking speed of detritus at surface [m/day]
!   k1p      = half saturation constant for P uptake
!   jdiar    = factor reducing the growth rate of diazotrophs
!   redctn   = C/N Redfield ratio (includes mol to mmol conversion)
!   redctp   = C/P Redfield ratio (includes mol to mmol conversion)
!   redptn   = P/N Redfield ratio
!   redntp   = N/P Redfield ratio
!   redotn   = O/N Redfield ratio (includes mol to mmol conversion)
!   redotp   = O/P Redfield ratio (includes mol to mmol conversion)
!   rnbio    = reciprical of nbio
!   rdtts    = reciprical of dtts [s-1]
!   dtbio    = npzd time step [s]
!   rnpp     = rate of net primary production [nmol cm-3 s-1]
!   rgraz    = rate of grazing [nmol cm-3 s-1]
!   rmorp    = rate of mortality of phytoplankton [nmol cm-3 s-1]
!   rmorz    = rate of mortality of zooplankton [nmol cm-3 s-1]
!   rremi    = rate of remineralization [nmol cm-3 s-1]
!   rexcr    = rate of excretion [nmol cm-3 s-1]
!   rexpo    = rate of export through the bottom [nmol cm-3 s-1]
!   rnpp_D   = npp for diazotraphs [nmol cm-3 s-1]
!   rgraz_D  = rgraz for diazotraphs [nmol cm-3 s-1]
!   rmorp_D  = rmorp for diazotraphs [nmol cm-3 s-1]
!   rnfix    = rate of nitrogen fixation [nmol cm-3 s-1]
!   rdeni    = rate of denitrification [nmol cm-3 s-1]

      integer ntnpzd, nbio
#if defined O_npzd_nitrogen
      parameter (ntnpzd=6)
#else
      parameter (ntnpzd=4)
#endif
      common /npzd_i/ nbio(km)

      real trcmin
      parameter (trcmin=5e-12)

      real alpha, kw, kc, ki, abio, bbio, cbio, k1n, nup, gamma1, gbio
      real epsbio, nuz, gamma2, nud0, LFe, wd, ztt, rkwz, par, dtnpzd
      real capr, dcaco3, rcak, rcab, nupt0, wd0, k1p, jdiar, redctn
      real redctp, redptn, redntp, redotn, redotp, rnbio, rdtts, dtbio
      real rnpp, rgraz, rmorp, rmorpt, rmorz, rremi, rexcr,  rexpo
      real rnpp_D, rgraz_D, rmorp_D, rnfix, rdeni

      common /npzd_r/ alpha, kw, kc, ki, abio, bbio, cbio, k1n, nup
      common /npzd_r/ gamma1, gbio, epsbio, nuz, gamma2, nud0, LFe
      common /npzd_r/ wd(km), ztt(km), rkwz(km), par, dtnpzd, capr
      common /npzd_r/ dcaco3, rcak(km), rcab(km), nupt0, wd0, k1p
      common /npzd_r/ jdiar, redctn, redctp, redptn, redntp, redotn
      common /npzd_r/ redotp, rnbio(km), rdtts(km), dtbio(km)
#if defined O_save_npzd
      common /npzd_r/ rnpp(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rgraz(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rmorp(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rmorpt(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rmorz(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rexcr(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rremi(imt,km,jsmw:jemw)
      common /npzd_r/ rexpo(imt,km,jsmw:jemw)
# if defined O_npzd_nitrogen
      common /npzd_r/ rnpp_D(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rgraz_D(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rmorp_D(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rnfix(imt,kpzd,jsmw:jemw)
      common /npzd_r/ rdeni(imt,km,jsmw:jemw)
# endif
#endif