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

Timestamp:

2020-10-12T10:57:50+02:00 (4 years ago)

Author:

rlod

Comment:

--

2020WP/TOP-01_rlod_Antarctic_ice_Sheet_Fe_Source

@@ -35 +35 @@
 }}}
 
-Fe is actualized according to the external sources of Fe from iceberg and ice shelf.
-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.
+External sources of biogeochemical tracers from iceberg and ice shelf.
+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.
 
 File dependency: feshwater fluxes from ice shelf and iceberg from observations and model climatology:
@@ -46 +46 @@
 Consequently, this external of source Fe will be disabled in the ORCA2 configuration.
 
-Two options are possible to implement the development of the AIS Fe source:
-- Activation in PISCES: namelist_pisces (originally developed)
 - Activation in TOP: namelist_top
+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:
 
-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.
+ln_trcais     =  .false. !  Antarctic Ice Sheet nutrient supply
 
-Starting point to create the trc_ais routine (3 subroutines): 
-- trc_sbc (trc_bc?) for the structure
-- trc_ice for initialization, calling/reading of the 25 bgc tracers
-- p4zsed for interpolation and read freshwater flux from icebergs and ice shelves
+!-----------------------------------------------------------------------
+&namtrc_ais      !  Representation of Antarctic Ice Sheet tracers supply
+!-----------------------------------------------------------------------
+   rn_trafac(14) =  4.476e-07   !  (  0.5e-3 / 55.85 * 0.05 )
+!
+   nn_ais_tr     =  1      !  tracer concentration in iceberg and ice shelf
+                           !    = 0 (null concentrations)
+                           !    = 1 prescribed concentrations
+   rn_icbdep     =  120.   ! Mean underwater depth of iceberg (m)
 
-To be added in the namelist_top
-- isffeinput: Fraction of bioavailable iron in ice shelves
-- icbfeinput: Fraction of bioavailable iron in iceberg
-- icbdepth: surface distribution (0) or throughout the water column until 120 m (1)
+Warning: the isf source has to be activated in the namelist_cfg: parameter
+    ln_isf = .true.
+ then chose one of the two options for isf melt:
 
-Do we use the same value fraction of bioavailable iron for both sources?
+ ln_isfcav_mlt = .false. or ln_isfpar_mlt = .true.
 
-Warning: the isf source has to be activated in the namelist_cfg: parameter nn_isf >0 
+and activate runoff from icebergs
 
-Orginally (activated in namelist_pisces_cfg  with boolean ln_ironice)
+   ln_rnf_icb  = .true.    ! freshwater flux from icebergs
 
-Modified routines: 
-- p4zsbc.F90 
-- p4zsed.F90
-
-Intermediate variables created to compute ziron variable: 
-- zironberg: iron from iceberg freshwater flux
-- zironisf: iron from ice shelf freshwater flux
 
 === Documentation updates