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2021WP/VLD-09_RPerson_Antarctic_ice_Sheet_Fe_Source (diff) – NEMO

Changes between Version 15 and Version 16 of 2021WP/VLD-09_RPerson_Antarctic_ice_Sheet_Fe_Source


Ignore:
Timestamp:
2021-11-25T16:58:35+01:00 (6 months ago)
Author:
rlod
Comment:

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  • 2021WP/VLD-09_RPerson_Antarctic_ice_Sheet_Fe_Source

    v15 v16  
    2626Validation of the TOP trcais.F90 module for representing the external source of biogeochemical tracers from icebergs and ice shelves, currently active for dissolved Fe. 
    2727 
    28 The validation consists of activating the AIS source of Fe in the TOP namelist with open and non-open ice shelf cavities in eORCA1 configuration grid and comparing the results with a control experiment where the external source is not activated.\\ 
     28The validation consists of activating the AIS source of Fe in the TOP namelist with open and non-open ice shelf cavities in eORCA1 configuration grid and comparing the results with the respective control experiment, i.e., with open or non-open ice shelf cavities, in which the external source of Fe is not activated.\\ 
    2929 
    3030Each experiment have a duration of 10 years. 
     
    6161Results of the validation experiments:\\ 
    6262See attachment for plots of surface Fe anomalies (relative to CTL) for parameterized ice shelf cavities (Fig. 1) and resolved ice shelf cavities (Fig. 2) when activating Fe input from the Antarctic ice sheet (nn_ais_tr = 1, prescribed tracer concentration in iceberg and ice shelf). \\ 
    63 - The results for the parameterized ice shelf cavities are as expected with a net positive effect on surface Fe concentrations.\\ 
    64 - For the resolved ice shelf cavities, the results are inconsistent - there are areas with a positive effect on surface iron concentrations and areas with a negative effect potentially induced by seawater circulation in the cavities (Fig. 2). This inconsistency is probably related to the lack of initial conditions for T, S and nutrients. A run will be made once the initial condition files in the cavities are constructed (cf work by K. Hutchinson). 
     63- The results for the parameterized ice shelf cavities are as expected a net positive effect on surface Fe concentrations relative to CTL.\\ 
     64- For the resolved ice shelf cavities, the results are  inconsistent - there are areas with a positive effect on surface iron concentrations and areas with a negative effect potentially induced by seawater circulation in the cavities (Fig. 2). This inconsistency is probably related to the lack of initial conditions for T, S and nutrients. A run will be made once the initial condition files in the cavities are constructed (cf work by K. Hutchinson). 
    6565 
    6666The model outputs are available on jeanzay (idris)