| 1 | ! gap routine - place for new plants |
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| 2 | ! |
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| 3 | ! Death rate of trees is estimated by evaluating their vigour (based on npp). |
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| 4 | ! For large availabilities, lifetime is 50 years (!?). |
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| 5 | ! Age of stands is not considered, although availability death rate should probably |
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| 6 | ! depend on age. |
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| 7 | ! |
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| 8 | ! $Header: /home/ssipsl/CVSREP/ORCHIDEE/src_stomate/lpj_gap.f90,v 1.10 2009/01/06 15:01:25 ssipsl Exp $ |
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| 9 | ! IPSL (2006) |
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| 10 | ! This software is governed by the CeCILL licence see ORCHIDEE/ORCHIDEE_CeCILL.LIC |
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| 11 | ! |
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| 12 | MODULE lpj_gap |
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| 13 | |
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| 14 | ! modules used: |
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| 15 | |
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| 16 | USE ioipsl |
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| 17 | USE stomate_data |
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| 18 | USE pft_parameters |
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| 19 | USE parallel |
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| 20 | USE constantes |
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| 21 | |
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| 22 | IMPLICIT NONE |
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| 23 | |
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| 24 | ! private & public routines |
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| 25 | |
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| 26 | PRIVATE |
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| 27 | PUBLIC gap,gap_clear |
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| 28 | |
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| 29 | ! first call |
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| 30 | LOGICAL, SAVE :: firstcall = .TRUE. |
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| 31 | |
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| 32 | CONTAINS |
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| 33 | |
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| 34 | |
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| 35 | SUBROUTINE gap_clear |
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| 36 | firstcall = .TRUE. |
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| 37 | END SUBROUTINE gap_clear |
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| 38 | |
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| 39 | SUBROUTINE gap (npts, dt, & |
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| 40 | npp_longterm, turnover_longterm, lm_lastyearmax, & |
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| 41 | PFTpresent, biomass, ind, bm_to_litter, mortality) |
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| 42 | |
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| 43 | ! |
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| 44 | ! 0 declarations |
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| 45 | ! |
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| 46 | |
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| 47 | ! 0.1 input |
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| 48 | |
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| 49 | ! Domain size |
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| 50 | INTEGER(i_std), INTENT(in) :: npts |
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| 51 | ! Time step (days) |
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| 52 | REAL(r_std), INTENT(in) :: dt |
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| 53 | ! "long term" net primary productivity (gC/(m**2 of ground)/year) |
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| 54 | REAL(r_std), DIMENSION(npts,nvm), INTENT(in) :: npp_longterm |
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| 55 | ! "long term" turnover rate (gC/(m**2 of ground)/year) |
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| 56 | REAL(r_std), DIMENSION(npts,nvm,nparts), INTENT(in) :: turnover_longterm |
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| 57 | ! last year's maximum leaf mass, for each PFT (gC/(m**2 of ground)) |
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| 58 | REAL(r_std), DIMENSION(npts,nvm), INTENT(in) :: lm_lastyearmax |
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| 59 | |
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| 60 | ! 0.2 modified fields |
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| 61 | |
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| 62 | ! Is pft there |
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| 63 | LOGICAL, DIMENSION(npts,nvm), INTENT(in) :: PFTpresent |
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| 64 | ! biomass (gC/(m**2 of ground)) |
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| 65 | REAL(r_std), DIMENSION(npts,nvm,nparts), INTENT(inout) :: biomass |
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| 66 | ! Number of individuals / (m**2 of ground) |
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| 67 | REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: ind |
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| 68 | ! biomass taken away (gC/(m**2 of ground)) |
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| 69 | REAL(r_std), DIMENSION(npts,nvm,nparts), INTENT(inout) :: bm_to_litter |
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| 70 | ! mortality (fraction of trees that is dying per time step), per day in history file |
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| 71 | REAL(r_std), DIMENSION(npts,nvm),INTENT(out) :: mortality |
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| 72 | |
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| 73 | ! 0.3 local |
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| 74 | |
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| 75 | ! biomass increase |
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| 76 | REAL(r_std), DIMENSION(npts) :: delta_biomass |
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| 77 | ! biomass increase |
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| 78 | REAL(r_std), DIMENSION(npts) :: dmortality |
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| 79 | ! vigour |
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| 80 | REAL(r_std), DIMENSION(npts) :: vigour |
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| 81 | ! natural availability, based on vigour |
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| 82 | REAL(r_std), DIMENSION(npts) :: availability |
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| 83 | ! indices |
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| 84 | INTEGER(i_std) :: j,k,m |
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| 85 | REAL(r_std) :: ref_greff |
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| 86 | |
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| 87 | ! ========================================================================= |
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| 88 | |
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| 89 | IF ( firstcall ) THEN |
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| 90 | |
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| 91 | firstcall = .FALSE. |
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| 92 | |
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| 93 | ENDIF |
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| 94 | |
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| 95 | IF (bavard.GE.3) WRITE(numout,*) 'Entering gap',lpj_gap_const_mort |
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| 96 | |
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| 97 | mortality(:,:) = zero |
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| 98 | |
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| 99 | ref_greff = 0.035 |
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| 100 | |
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| 101 | DO j = 2,nvm |
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| 102 | |
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| 103 | ! only trees |
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| 104 | |
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| 105 | IF ( tree(j) ) THEN |
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| 106 | |
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| 107 | ! |
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| 108 | ! 1 determine availability |
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| 109 | ! |
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| 110 | |
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| 111 | IF ( .NOT. lpj_gap_const_mort ) THEN |
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| 112 | |
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| 113 | ! |
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| 114 | ! 1.1 original formulation: mortality depends on vigour |
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| 115 | ! |
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| 116 | |
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| 117 | WHERE ( PFTpresent(:,j) .AND. ( lm_lastyearmax(:,j) .GT. min_stomate ) ) |
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| 118 | |
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| 119 | !SZ 080806, changed to LPJ formulation according to Smith et al., 2001 |
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| 120 | |
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| 121 | ! how much did the tree grow per year? |
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| 122 | |
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| 123 | !!$ delta_biomass(:) = & |
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| 124 | !!$ MAX( npp_longterm(:,j) - ( turnover_longterm(:,j,ileaf) + & |
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| 125 | !!$ turnover_longterm(:,j,iroot) + turnover_longterm(:,j,ifruit) ), & |
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| 126 | !!$ 0._r_std ) |
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| 127 | |
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| 128 | ! note that npp_longterm is now actually longterm growth efficiency (NPP/LAI) |
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| 129 | ! to be fair to deciduous trees |
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| 130 | delta_biomass(:) = MAX( npp_longterm(:,j) - ( turnover_longterm(:,j,ileaf) + & |
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| 131 | turnover_longterm(:,j,iroot) + turnover_longterm(:,j,ifruit) + & |
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| 132 | turnover_longterm(:,j,isapabove) + turnover_longterm(:,j,isapbelow) ) ,zero) |
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| 133 | |
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| 134 | ! scale this to the leaf surface of the tree |
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| 135 | !!$ vigour(:) = delta_biomass(:) / (lm_lastyearmax(:,j)*sla(j)) / vigour_coeff |
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| 136 | vigour(:) = delta_biomass(:) / (lm_lastyearmax(:,j)*sla(j)) |
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| 137 | |
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| 138 | ELSEWHERE |
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| 139 | |
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| 140 | vigour(:) = 0.0 |
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| 141 | |
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| 142 | ENDWHERE |
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| 143 | |
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| 144 | WHERE ( PFTpresent(:,j) ) |
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| 145 | |
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| 146 | ! note that availability is never above 0.02, i.e. lifetime of 50 years when very |
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| 147 | ! low vigour. |
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| 148 | |
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| 149 | !SZ 080806, changed to LPJ formulation according to Smith et al., 2001 |
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| 150 | ! tuned maximal mortality to 0.05 to get realistic range of avergage age to get ~100 years at GREFF=100 |
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| 151 | ! for the range of modelled annual NPP |
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| 152 | !!$ availability(:) = min_avail / ( 1.+vigour(:)/vigour_ref ) |
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| 153 | availability(:) = 0.1 / ( 1.+ref_greff*vigour(:) ) |
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| 154 | |
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| 155 | ! Mortality (fraction per time step). |
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| 156 | ! In the original DGVM, mortality was set to zero if there was strong fire |
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| 157 | ! perturbation. |
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| 158 | ! This has been de-activated since the npp is not influenced by fire, |
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| 159 | ! as opposed to the original DGVM. Instead, mortality is simply |
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| 160 | ! equal to the availability, modulated by the time step. |
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| 161 | ! Exact formulation: mor = 1. - ( 1. - availability ) ** (dt/one_year) |
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| 162 | ! approximation ok as availability < 0.02 << 1 |
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| 163 | |
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| 164 | mortality(:,j) = MAX(min_avail,availability(:)) * dt/one_year |
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| 165 | !!$ mortality(:,j) = availability(:) * dt/one_year |
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| 166 | |
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| 167 | ENDWHERE |
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| 168 | |
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| 169 | ELSE |
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| 170 | |
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| 171 | ! |
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| 172 | ! 1.2 Alternative version: Constant mortality |
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| 173 | ! |
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| 174 | |
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| 175 | WHERE ( PFTpresent(:,j) ) |
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| 176 | |
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| 177 | mortality(:,j) = dt/(residence_time(j)*one_year) |
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| 178 | |
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| 179 | ENDWHERE |
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| 180 | |
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| 181 | ENDIF |
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| 182 | |
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| 183 | ! |
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| 184 | ! 2 Special for the DGVM: |
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| 185 | ! mortality is one if npp is zero or negative. |
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| 186 | ! |
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| 187 | |
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| 188 | IF ( control%ok_dgvm ) THEN |
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| 189 | |
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| 190 | WHERE ( PFTpresent(:,j) .AND. ( npp_longterm(:,j) .LE. min_stomate ) ) |
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| 191 | |
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| 192 | mortality(:,j) = 1. |
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| 193 | |
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| 194 | ENDWHERE |
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| 195 | |
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| 196 | ENDIF |
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| 197 | |
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| 198 | ! |
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| 199 | ! 3 update biomass, create litter |
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| 200 | ! |
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| 201 | |
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| 202 | DO k = 1, nparts |
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| 203 | |
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| 204 | WHERE ( PFTpresent(:,j) ) |
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| 205 | |
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| 206 | dmortality(:) = mortality(:,j) * biomass(:,j,k) |
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| 207 | bm_to_litter(:,j,k) = bm_to_litter(:,j,k) + dmortality(:) |
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| 208 | |
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| 209 | biomass(:,j,k) = biomass(:,j,k) - dmortality(:) |
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| 210 | |
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| 211 | ENDWHERE |
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| 212 | |
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| 213 | ENDDO |
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| 214 | |
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| 215 | ! |
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| 216 | ! 4 update number of individuals |
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| 217 | ! |
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| 218 | |
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| 219 | !SZ 080806, allow changing density in static case when mortality is dynamic |
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| 220 | IF ( control%ok_dgvm .OR. .NOT.lpj_gap_const_mort) THEN |
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| 221 | |
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| 222 | WHERE ( PFTpresent(:,j) ) |
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| 223 | |
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| 224 | ind(:,j) = ind(:,j) * ( un - mortality(:,j) ) |
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| 225 | |
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| 226 | ENDWHERE |
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| 227 | |
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| 228 | ENDIF |
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| 229 | |
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| 230 | ELSE |
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| 231 | |
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| 232 | IF ( .NOT.control%ok_dgvm .AND. .NOT.lpj_gap_const_mort) THEN |
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| 233 | |
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| 234 | WHERE ( PFTpresent(:,j) .AND. ( npp_longterm(:,j) .LE. 10. ) ) |
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| 235 | |
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| 236 | mortality(:,j) = 1. |
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| 237 | |
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| 238 | ENDWHERE |
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| 239 | DO k = 1, nparts |
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| 240 | |
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| 241 | WHERE ( PFTpresent(:,j) ) |
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| 242 | |
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| 243 | dmortality(:) = mortality(:,j) * biomass(:,j,k) |
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| 244 | |
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| 245 | bm_to_litter(:,j,k) = bm_to_litter(:,j,k) + dmortality(:) |
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| 246 | |
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| 247 | biomass(:,j,k) = biomass(:,j,k) - dmortality(:) |
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| 248 | |
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| 249 | ENDWHERE |
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| 250 | ENDDO |
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| 251 | |
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| 252 | ENDIF |
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| 253 | |
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| 254 | ENDIF ! only trees |
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| 255 | |
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| 256 | ENDDO ! loop over pfts |
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| 257 | |
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| 258 | ! |
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| 259 | ! 5 history |
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| 260 | ! |
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| 261 | |
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| 262 | ! output in fraction of trees that dies/day. |
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| 263 | ! exact formulation: 1. - ( 1. - mortality ) ** (1./dt) |
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| 264 | mortality = mortality / dt |
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| 265 | |
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| 266 | CALL histwrite (hist_id_stomate, 'MORTALITY', itime, & |
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| 267 | mortality, npts*nvm, horipft_index) |
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| 268 | |
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| 269 | IF (bavard.GE.4) WRITE(numout,*) 'Leaving gap' |
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| 270 | |
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| 271 | END SUBROUTINE gap |
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| 272 | |
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| 273 | END MODULE lpj_gap |
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