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

Changes between Version 16 and Version 17 of 2021WP/VLD-09_RPerson_Antarctic_ice_Sheet_Fe_Source


Ignore:
Timestamp:
2021-11-26T16:34:08+01:00 (6 months ago)
Author:
rlod
Comment:

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  • 2021WP/VLD-09_RPerson_Antarctic_ice_Sheet_Fe_Source

    v16 v17  
    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 the respective control experiment, i.e., with open or non-open ice shelf cavities, in which the external source of Fe is not activated.\\ 
     28The validation consists of activating the AIS source of Fe in namelist TOP 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 (CTL_CAV and CTL_PAR, respectively), in which the external source of Fe is not activated.\\ 
    2929 
    3030Each experiment have a duration of 10 years. 
     
    6060== Tests 
    6161Results of the validation experiments:\\ 
    62 See 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 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). 
     62See attachment for plots of surface Fe anomalies (relative to CTLs) 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 addition of Fe from the Antarctic continental ice results in both ice shelf cavitiy cases in a net positive effect on surface Fe concentrations relative to CTLs.\\ 
     64- Figure 3 shows the surface Fe anomalies when the AIS Fe source is activated between the open and non-open cavity experiments. This illustrates the potential impacts that seawater circulation in ice shelf cavities and Fe inputs associated with this circulation as well as direct inputs from melting ice shelves could have on surface Fe concentrations in the Southern Ocean. However, the seawater properties with open ice shelf cavities have not been initialised correctly for T, S and nutrients. A run should be performed once the initial condition files in the cavities are constructed (see work by K. Hutchinson). 
    6565 
    6666The model outputs are available on jeanzay (idris) 
    67 - CTL run : /gpfsstore/rech/omr/romr014/IGCM_OUT/NEMO/DEVT/clim/eOR1Si3Pv4-CLIM-CORE-CTL 
     67- CTL_PAR run : /gpfsstore/rech/omr/romr014/IGCM_OUT/NEMO/DEVT/clim/eOR1Si3Pv4-CLIM-CORE-CTL 
     68- CTL_CAV run: /gpfsstore/rech/omr/romr014/IGCM_OUT/NEMO/DEVT/clim/eOR1Si3Pv4-CTL-CAV/ 
    6869- ice shelf cavities parametrized (nn_ais_tr = 1):  /gpfsstore/rech/omr/romr014/IGCM_OUT/NEMO/DEVT/clim/eOR1Si3Pv4-AISFe-PAR1 
    6970- ice shelf cavities resolved (nn_ais_tr = 1): /gpfsstore/rech/omr/romr014/IGCM_OUT/NEMO/DEVT/clim/eOR1Si3Pv4-AISFe-CAV1