Changeset 6316 for branches/2015/nemo_v3_6_STABLE/NEMOGCM/CONFIG/SHARED

Timestamp:

2016-02-15T14:35:37+01:00 (8 years ago)

Author:

cetlod

Message:

3.6 stable : new realistic calculation of sea-ice albedo ( we keep the existing one ), see ticket #1678

Location:

branches/2015/nemo_v3_6_STABLE/NEMOGCM/CONFIG/SHARED

Files:

• field_def.xml (modified) (3 diffs)
• namelist_ice_lim3_ref (modified) (1 diff)
• namelist_ref (modified) (1 diff)

branches/2015/nemo_v3_6_STABLE/NEMOGCM/CONFIG/SHARED/field_def.xml

@@ -174 +174 @@
       <field_group id="SBC" grid_ref="grid_T_2D" > <!-- time step automaticaly defined based on nn_fsbc -->
          <field id="empmr"        long_name="Net Upward Water Flux"                standard_name="water_flux_out_of_sea_ice_and_sea_water"                              unit="kg/m2/s"   />
+         <field id="emp_oce"      long_name="Evap minus Precip over ocean"         standard_name="evap_minus_precip_over_sea_water"                                     unit="kg/m2/s"   />
+         <field id="emp_ice"      long_name="Evap minus Precip over ice"           standard_name="evap_minus_precip_over_sea_ice"                                       unit="kg/m2/s"   />
          <field id="saltflx"      long_name="Downward salt flux"                                                                                                        unit="1e-3/m2/s" />
          <field id="fmmflx"       long_name="Water flux due to freezing/melting"                                                                                        unit="kg/m2/s"   />
@@ -274 +276 @@
          <field id="micesalt"     long_name="Mean ice salinity"                                                                                                               unit="1e-3"         />
          <field id="miceage"      long_name="Mean ice age"                                                                                                                    unit="years"        />
+         <field id="alb_ice"      long_name="Mean albedo over sea ice"                                                                                                        unit=""             />
+         <field id="albedo"       long_name="Mean albedo over sea ice and ocean"                                                                                              unit=""             />
 
          <field id="iceage_cat"   long_name="Ice age for categories"                                       unit="days"   axis_ref="ncatice" />
@@ -324 +328 @@
          <field id="vfxsub"       long_name="snw sublimation"                                              unit="m/day"   />
          <field id="vfxspr"       long_name="snw precipitation on ice"                                     unit="m/day"   />
+         <field id="vfxthin"      long_name="daily thermo ice prod. for thin ice(<20cm) + open water"      unit="m/day"   />
 
          <field id="afxtot"       long_name="area tendency (total)"                                        unit="day-1"   />

branches/2015/nemo_v3_6_STABLE/NEMOGCM/CONFIG/SHARED/namelist_ice_lim3_ref

@@ -86 +86 @@
    rn_hnewice  = 0.1               !  thickness for new ice formation in open water (m)
    ln_frazil   = .false.           !  use frazil ice collection thickness as a function of wind (T) or not (F)
-   rn_maxfrazb = 0.0               !  maximum fraction of frazil ice collecting at the ice base
+   rn_maxfrazb = 1.0               !  maximum fraction of frazil ice collecting at the ice base
    rn_vfrazb   = 0.417             !  thresold drift speed for frazil ice collecting at the ice bottom (m/s)
    rn_Cfrazb   = 5.0               !  squeezing coefficient for frazil ice collecting at the ice bottom

branches/2015/nemo_v3_6_STABLE/NEMOGCM/CONFIG/SHARED/namelist_ref

@@ -500 +500 @@
 &namsbc_alb    !   albedo parameters
 !-----------------------------------------------------------------------
-   rn_cloud    =    0.06   !  cloud correction to snow and ice albedo
-   rn_albice   =    0.53   !  albedo of melting ice in the arctic and antarctic
-   rn_alphd    =    0.80   !  coefficients for linear interpolation used to
-   rn_alphc    =    0.65   !  compute albedo between two extremes values
-   rn_alphdi   =    0.72   !  (Pyane, 1972)
+   nn_ice_alb  =    1   !  parameterization of ice/snow albedo
+                        !     0: Shine & Henderson-Sellers (JGR 1985)
+                        !     1: "home made" based on Brandt et al. (J. Climate 2005)
+                        !                         and Grenfell & Perovich (JGR 2004)
+   rn_albice   =  0.50  !  albedo of bare puddled ice (values from 0.49 to 0.58)
+                        !     0.53 (default) => if nn_ice_alb=0
+                        !     0.50 (default) => if nn_ice_alb=1
 /
 !-----------------------------------------------------------------------