Changes between Version 13 and Version 14 of 2020WP/TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source


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Timestamp:
2020-10-12T10:57:50+02:00 (3 months ago)
Author:
rlod
Comment:

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  • 2020WP/TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source

    v13 v14  
    3535}}} 
    3636 
    37 Fe is actualized according to the external sources of Fe from iceberg and ice shelf. 
    38 A sediment content associated to a solubility fraction of sediment Fe is added to the freshwater fluxes of iceberg and ice shelf. For ice shelf, the parameterization of Mathiot et al. (2017) is used for the distribution of Fe throughout the water column. For iceberg, a homogeneous distribution until 120 m of depth is applied. 
     37External sources of biogeochemical tracers from iceberg and ice shelf. 
     38For instance, for dissoved Fe, a sediment content associated to a solubility fraction of sediment Fe is added to the freshwater fluxes of iceberg and ice shelf. For ice shelf, the parameterization of Mathiot et al. (2017) is used for the distribution of Fe throughout the water column. For iceberg, a homogeneous distribution until 120 m of depth is applied. 
    3939 
    4040File dependency: feshwater fluxes from ice shelf and iceberg from observations and model climatology: 
     
    4646Consequently, this external of source Fe will be disabled in the ORCA2 configuration. 
    4747 
    48 Two options are possible to implement the development of the AIS Fe source: 
    49 - Activation in PISCES: namelist_pisces (originally developed) 
    5048- Activation in TOP: namelist_top 
     49Creation of the trc_ais routine controllable in the TOP module and allowing to adjust the concentration of Fe and other biogeochemical tracers in icebergs and ice shelves through a loop over all the biogeochemical tracers. This AIS tracers source can be activated with a boolean in the namelist_top: 
    5150 
    52 We opt for the generic solution by creating a trc_ais routine controllable in the TOP module and allowing to adjust the concentration of Fe and of other biogeochemical tracers in icebergs and ice shelves through a loop over all the biogeochemical tracers. This AIS tracers source will be activated with a boolean in the namelist_top named, ln_trcais. 
     51ln_trcais     =  .false. !  Antarctic Ice Sheet nutrient supply 
    5352 
    54 Starting point to create the trc_ais routine (3 subroutines):  
    55 - trc_sbc (trc_bc?) for the structure 
    56 - trc_ice for initialization, calling/reading of the 25 bgc tracers 
    57 - p4zsed for interpolation and read freshwater flux from icebergs and ice shelves 
     53!----------------------------------------------------------------------- 
     54&namtrc_ais      !  Representation of Antarctic Ice Sheet tracers supply 
     55!----------------------------------------------------------------------- 
     56   rn_trafac(14) =  4.476e-07   !  (  0.5e-3 / 55.85 * 0.05 ) 
     57! 
     58   nn_ais_tr     =  1      !  tracer concentration in iceberg and ice shelf 
     59                           !    = 0 (null concentrations) 
     60                           !    = 1 prescribed concentrations 
     61   rn_icbdep     =  120.   ! Mean underwater depth of iceberg (m) 
    5862 
    59 To be added in the namelist_top 
    60 - isffeinput: Fraction of bioavailable iron in ice shelves 
    61 - icbfeinput: Fraction of bioavailable iron in iceberg 
    62 - icbdepth: surface distribution (0) or throughout the water column until 120 m (1) 
     63Warning: the isf source has to be activated in the namelist_cfg: parameter 
     64    ln_isf = .true. 
     65 then chose one of the two options for isf melt: 
    6366 
    64 Do we use the same value fraction of bioavailable iron for both sources? 
     67 ln_isfcav_mlt = .false. or ln_isfpar_mlt = .true. 
    6568 
    66 Warning: the isf source has to be activated in the namelist_cfg: parameter nn_isf >0  
     69and activate runoff from icebergs 
    6770 
    68 Orginally (activated in namelist_pisces_cfg  with boolean ln_ironice) 
     71   ln_rnf_icb  = .true.    ! freshwater flux from icebergs 
    6972 
    70 Modified routines:  
    71 - p4zsbc.F90  
    72 - p4zsed.F90 
    73  
    74 Intermediate variables created to compute ziron variable:  
    75 - zironberg: iron from iceberg freshwater flux 
    76 - zironisf: iron from ice shelf freshwater flux 
    7773 
    7874=== Documentation updates