Changes between Version 14 and Version 15 of 2020WP/TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source


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Timestamp:
2020-10-14T17:13:28+02:00 (3 months ago)
Author:
rlod
Comment:

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  • 2020WP/TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source

    v14 v15  
    2828=== Implementation 
    2929 
    30 {{{#!box width=35em help 
    31 Describe flow chart of the changes in the code. \\ 
    32 List the Fortran modules and subroutines to be created/edited/deleted. \\ 
    33 Detailed list of new variables to be defined (including namelists), \\ 
    34 give for each the chosen name and description wrt coding rules. 
    35 }}} 
     30Representation of the external source of biogeochemical tracers from iceberg and ice shelf. 
     31For 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 iceberg, a homogeneous distribution of the biogeochemical tracers until 120 m of depth is applied. For ice shelf, the biogeochemical tracer content is distributed homogeneously following the representation of the isf freshwater flux of Mathiot et al. (2017) whether the under ice shelf cavities are open or not.  
    3632 
    37 External sources of biogeochemical tracers from iceberg and ice shelf. 
    38 For 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. 
    39  
    40 File dependency: feshwater fluxes from ice shelf and iceberg from observations and model climatology: 
     33File dependency: feshwater fluxes from ice shelf and iceberg: 
    4134- runoff-icb_DaiTrenberth_Depoorter_eORCA1_JD.nc 
    4235- runoff-icb_DaiTrenberth_Depoorter_eORCA025_JD.nc 
    4336 
    44 This file dependency didn’t exist for ORCA2 grid. I have build one but roughly interpolated. Another issue with the ORCA2 configuration is that the grid is not extended in the Antarctic. There is no representation of ice shelf cavities which are needed to model the distribution of freshwater flux under ice shelves with the parameterization of Mathiot et al. (2017) used in the present development. 
     37This file dependency didn’t exist for ORCA2 configuration as the grid is not extended in Antarctica. Thus, there is no representation of ice shelf cavities which are needed to model the distribution of freshwater flux under ice shelves with the parameterizations of Mathiot et al. (2017). Thus, this module can not be activated in ORCA2, the external source of BGC tracers from the Antarctic Ice Sheet is consequently disabled in this configuration. 
    4538 
    46 Consequently, this external of source Fe will be disabled in the ORCA2 configuration. 
     39- Activation in TOP: 
    4740 
    48 - Activation in TOP: namelist_top 
    49 Creation 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: 
     41Creation of the trcais routine controllable in TOP module, which allows to adjust the concentration of Fe, for now, and of other biogeochemical tracers (potentially later) associated with iceberg and ice shelf freshwater fluxes through a loop over all the biogeochemical tracers. The AIS tracers source can be activated with a boolean in the namelist_top: 
    5042 
    5143ln_trcais     =  .false. !  Antarctic Ice Sheet nutrient supply 
    5244 
    5345!----------------------------------------------------------------------- 
     46 
    5447&namtrc_ais      !  Representation of Antarctic Ice Sheet tracers supply 
     48 
    5549!----------------------------------------------------------------------- 
    5650   rn_trafac(14) =  4.476e-07   !  (  0.5e-3 / 55.85 * 0.05 ) 
    5751! 
    5852   nn_ais_tr     =  1      !  tracer concentration in iceberg and ice shelf 
    59                            !    = 0 (null concentrations) 
    60                            !    = 1 prescribed concentrations 
     53 
     54- 0 is for null concentrations 
     55- 1 for prescribed concentrations 
     56 
    6157   rn_icbdep     =  120.   ! Mean underwater depth of iceberg (m) 
    6258 
    63 Warning: 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: 
     59Warning: the isf source has to be activated in the namelist_cfg: 
     60 ln_isf = .true. 
     61then chose one of the two options for isf melt: 
    6662 
    6763 ln_isfcav_mlt = .false. or ln_isfpar_mlt = .true. 
     
    6965and activate runoff from icebergs 
    7066 
    71    ln_rnf_icb  = .true.    ! freshwater flux from icebergs 
     67 ln_rnf_icb  = .true.    ! freshwater flux from icebergs 
    7268 
     69created routine: 
     70- trcais.F90 
     71 
     72List of modified routines: 
     73 
     74- nemogcm.F90 
     75- sbcrnf.F90 
     76- trc.F90 
     77- trcini.F90 
     78- trcnam.F90 
     79- trctrp.F90 
    7380 
    7481=== Documentation updates