From 5492342668a01dd4dcc7c4becc020e5d809d4b0d Mon Sep 17 00:00:00 2001 From: Xylar Asay-Davis Date: Tue, 30 Jun 2026 10:09:49 +0200 Subject: [PATCH 1/3] Fix bounds on lithk, orog, topg and ligroundf Antarctic max elevation is ~5000 m, so give it some buffer. Grounding line flux can occasionally go negative (e.g. at ice rises) so allow a small, negative flux. --- conventions/ISMIP7_variable_request.csv | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/conventions/ISMIP7_variable_request.csv b/conventions/ISMIP7_variable_request.csv index 8d4db8f..9b04600 100644 --- a/conventions/ISMIP7_variable_request.csv +++ b/conventions/ISMIP7_variable_request.csv @@ -1,7 +1,7 @@ long_name,Dim,Type,Variable Name,standard_name,units,Mandatory (yes/no),Comment,min_value_ais,max_value_ais,min_value_gris,max_value_gris -Ice thickness,"x,y,t",ST,lithk,land_ice_thickness,m,yes,Ice thickness of the ice sheet,0,5000,0,5000 -Surface elevation,"x,y,t",ST,orog,surface_altitude,m,yes,Surface elevation of the ice sheet,0,4500,0,4500 -Bedrock elevation,"x,y,t",ST,topg,bedrock_altitude,m,yes,The bedrock topography (may change during the projections),-7000,4000,-4000,4000 +Ice thickness,"x,y,t",ST,lithk,land_ice_thickness,m,yes,Ice thickness of the ice sheet,0,5500,0,5000 +Surface elevation,"x,y,t",ST,orog,surface_altitude,m,yes,Surface elevation of the ice sheet,0,5500,0,4500 +Bedrock elevation,"x,y,t",ST,topg,bedrock_altitude,m,yes,The bedrock topography (may change during the projections),-7000,5500,-4000,4000 Ice base elevation,"x,y,t",ST,base,,m,yes,Should get standard name land_ice_temperature,-4000,4000,-4000,4000 Geothermal heat flux,"x,y,t",FL,hfgeoubed,upward_geothermal_heat_flux_in_land_ice,W m-2,no,Geothermal Heat flux at the ice interface,0,0.3,0,0.3 Surface mass balance flux,"x,y,t",FL,acabf,land_ice_surface_specific_mass_balance_flux,kg m-2 s-1,yes,Surface Mass Balance flux,-0.0006,0.001,-0.0006,0.001 @@ -22,7 +22,7 @@ Basal temperature beneath grounded ice sheet,"x,y,t",ST,litempbotgr,temperature_ Basal temperature beneath floating ice shelf,"x,y,t",ST,litempbotfl,temperature_at_base_of_ice_sheet_model,K,no,Ice temperature at base of floating ice shelf,183,290,183,290 Basal drag,"x,y,t",ST,strbasemag,land_ice_basal_drag,Pa,yes,Basal drag,0,300000,0,300000 Calving flux,"x,y,t",FL,licalvf,land_ice_specific_mass_flux_due_to_calving,kg m-2 s-1,yes,Ice mass change resulting from iceberg calving. Only for grid cells in contact with ocean,-1.00E+11,0,-1.00E+11,0 -Grounding line flux,"x,y,t",FL,ligroundf,,kg m-2 s-1,yes,Flux of ice mass across the grounding line. Only for grounding line grid cells. Should get standard name: land_ice_specific_grounding_line_flux,0,1.00E+11,0,1.00E+11 +Grounding line flux,"x,y,t",FL,ligroundf,,kg m-2 s-1,yes,Flux of ice mass across the grounding line. Only for grounding line grid cells. Should get standard name: land_ice_specific_grounding_line_flux,-1.00E+09,1.00E+11,-1.00E+09,1.00E+11 Ice front melt flux,"x,y,t",FL,lifmassbf,,kg m-2 s-1,yes,Ice mass change resulting from ice front melting. Only for grid cells in contact with ocean. Should get standard name: land_ice_specific_mass_flux_due_to_ice_front_melting,-1.00E+11,0,-1.00E+11,0 Land ice area fraction,"x,y,t",ST,sftgif,land_ice_area_fraction,1,yes,"Fraction of grid cell covered by land ice (ice sheet, ice shelf, ice cap, glacier)",0,1,0,1 Grounded ice sheet area fraction,"x,y,t",ST,sftgrf,grounded_ice_sheet_area_fraction,1,yes,"Fraction of grid cell covered by grounded ice sheet, where grounded indicates that the quantity correspond to the ice sheet that flows over bedrock",0,1,0,1 From 5ca587a3e867cd48f20f3a12320d8c82d1a5996d Mon Sep 17 00:00:00 2001 From: Xylar Asay-Davis Date: Tue, 30 Jun 2026 11:05:32 +0200 Subject: [PATCH 2/3] Increate AIS xvelmean and yvelmean to match GIS --- conventions/ISMIP7_variable_request.csv | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/conventions/ISMIP7_variable_request.csv b/conventions/ISMIP7_variable_request.csv index 9b04600..56882a4 100644 --- a/conventions/ISMIP7_variable_request.csv +++ b/conventions/ISMIP7_variable_request.csv @@ -14,8 +14,8 @@ Surface velocity in z,"x,y,t",ST,zvelsurf,land_ice_surface_upward_velocity,m s-1 Basal velocity in x,"x,y,t",ST,xvelbase,land_ice_basal_x_velocity,m s-1,no,u-velocity at land ice base,-0.0004,0.0004,-0.0008,0.0008 Basal velocity in y,"x,y,t",ST,yvelbase,land_ice_basal_y_velocity,m s-1,no,v-velocity at land ice base,-0.0004,0.0004,-0.0008,0.0008 Basal velocity in z,"x,y,t",ST,zvelbase,land_ice_basal_upward_velocity,m s-1,no,w-velocity at land ice base,-5.00E-06,5.00E-06,-8.00E-06,8.00E-06 -Mean velocity in x,"x,y,t",ST,xvelmean,land_ice_vertical_mean_x_velocity,m s-1,yes,Vertical mean land ice velocity ,-0.0004,0.0004,-0.0008,0.0008 -Mean velocity in y,"x,y,t",ST,yvelmean,land_ice_vertical_mean_y_velocity,m s-1,yes,The vertical mean land ice velocity is the average from the bedrock to the surface of the ice,-0.0004,0.0004,-0.0008,0.0008 +Mean velocity in x,"x,y,t",ST,xvelmean,land_ice_vertical_mean_x_velocity,m s-1,yes,Vertical mean land ice velocity ,-0.0008,0.0008,-0.0008,0.0008 +Mean velocity in y,"x,y,t",ST,yvelmean,land_ice_vertical_mean_y_velocity,m s-1,yes,The vertical mean land ice velocity is the average from the bedrock to the surface of the ice,-0.0008,0.0008,-0.0008,0.0008 Surface temperature,"x,y,t",ST,litemptop,temperature_at_top_of_ice_sheet_model,K,no,Ice temperature at surface,183,290,183,290 Depth average temperature,"x,y,t",ST,litempavg,,K,no,Should get standard name land_ice_temperature,183,290,183,290 Basal temperature beneath grounded ice sheet,"x,y,t",ST,litempbotgr,temperature_at_base_of_ice_sheet_model,K,no,Ice temperature at base of grounded ice sheet,183,290,183,290 From 6d012d6214b53b35e4f5bd4ff66077f3da544396 Mon Sep 17 00:00:00 2001 From: Xylar Asay-Davis Date: Tue, 30 Jun 2026 11:06:52 +0200 Subject: [PATCH 3/3] Increase max strbasemag --- conventions/ISMIP7_variable_request.csv | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/conventions/ISMIP7_variable_request.csv b/conventions/ISMIP7_variable_request.csv index 56882a4..889301e 100644 --- a/conventions/ISMIP7_variable_request.csv +++ b/conventions/ISMIP7_variable_request.csv @@ -20,7 +20,7 @@ Surface temperature,"x,y,t",ST,litemptop,temperature_at_top_of_ice_sheet_model,K Depth average temperature,"x,y,t",ST,litempavg,,K,no,Should get standard name land_ice_temperature,183,290,183,290 Basal temperature beneath grounded ice sheet,"x,y,t",ST,litempbotgr,temperature_at_base_of_ice_sheet_model,K,no,Ice temperature at base of grounded ice sheet,183,290,183,290 Basal temperature beneath floating ice shelf,"x,y,t",ST,litempbotfl,temperature_at_base_of_ice_sheet_model,K,no,Ice temperature at base of floating ice shelf,183,290,183,290 -Basal drag,"x,y,t",ST,strbasemag,land_ice_basal_drag,Pa,yes,Basal drag,0,300000,0,300000 +Basal drag,"x,y,t",ST,strbasemag,land_ice_basal_drag,Pa,yes,Basal drag,0,1.00E+06,0,1.00E+06 Calving flux,"x,y,t",FL,licalvf,land_ice_specific_mass_flux_due_to_calving,kg m-2 s-1,yes,Ice mass change resulting from iceberg calving. Only for grid cells in contact with ocean,-1.00E+11,0,-1.00E+11,0 Grounding line flux,"x,y,t",FL,ligroundf,,kg m-2 s-1,yes,Flux of ice mass across the grounding line. Only for grounding line grid cells. Should get standard name: land_ice_specific_grounding_line_flux,-1.00E+09,1.00E+11,-1.00E+09,1.00E+11 Ice front melt flux,"x,y,t",FL,lifmassbf,,kg m-2 s-1,yes,Ice mass change resulting from ice front melting. Only for grid cells in contact with ocean. Should get standard name: land_ice_specific_mass_flux_due_to_ice_front_melting,-1.00E+11,0,-1.00E+11,0