diff --git a/src/access_moppy/mappings/ACCESS-ESM1-6_mappings.json b/src/access_moppy/mappings/ACCESS-ESM1-6_mappings.json
index 035adc74..6f9d3a49 100644
--- a/src/access_moppy/mappings/ACCESS-ESM1-6_mappings.json
+++ b/src/access_moppy/mappings/ACCESS-ESM1-6_mappings.json
@@ -3094,12 +3094,7 @@
             "units": "kg m-2 s-1",
             "positive": "down",
             "model_variables": [
-                "fld_s03i262",
-                "fld_s03i293",
-                "fld_s03i907",
-                "fld_s03i908",
-                "fld_s03i909",
-                "fld_s03i317",
+                "fld_s03i100",
                 "fld_s03i395"
             ],
             "calculation": {
@@ -3107,44 +3102,22 @@
                 "operation": "divide",
                 "args": [
                     {
-                        "operation": "add",
-                        "operands": [
+                        "operation": "multiply",
+                        "args": [
                             {
-                                "operation": "add",
-                                "operands": [
-                                    "fld_s03i262",
+                                "operation": "divide",
+                                "args": [
                                     {
                                         "operation": "multiply",
                                         "args": [
-                                            "fld_s03i293",
-                                            -1
+                                            "fld_s03i100",
+                                            12
                                         ]
-                                    }
-                                ]
-                            },
-                            {
-                                "operation": "multiply",
-                                "args": [
-                                    {
-                                        "operation": "weighted_tile_sum",
-                                        "args": [
-                                            {
-                                                "operation": "add",
-                                                "operands": [
-                                                    "fld_s03i907",
-                                                    "fld_s03i908",
-                                                    "fld_s03i909"
-                                                ]
-                                            }
-                                        ],
-                                        "kwargs": {
-                                            "tilefrac": "fld_s03i317",
-                                            "landfrac": "fld_s03i395"
-                                        }
                                     },
-                                    -3.1688087814029657e-14
+                                    44.01
                                 ]
-                            }
+                            },
+                            -1
                         ]
                     },
                     "fld_s03i395"
@@ -3152,9 +3125,7 @@
             },
             "CF standard Name": "surface_net_downward_mass_flux_of_carbon_dioxide_expressed_as_carbon_due_to_all_land_processes",
             "model_variable_units": {
-                "fld_s03i262": "kg m-2 s-1",
-                "fld_s03i293": "kg m-2 s-1",
-                "fld_s03i317": "1",
+                "fld_s03i100": "kg m-2 s-1",
                 "fld_s03i395": "1"
             }
         },