diff --git a/config/model_configs/edmfx_adv_test_box.yml b/config/model_configs/edmfx_adv_test_box.yml
index fc59c7bf96..9a54b0105b 100644
--- a/config/model_configs/edmfx_adv_test_box.yml
+++ b/config/model_configs/edmfx_adv_test_box.yml
@@ -1,18 +1,21 @@
-dt_save_to_disk: "100secs"
+job_id: "edmfx_adv_test_box"
 initial_condition: "MoistAdiabaticProfileEDMFX"
-x_max: 10000.0
-hyperdiff: "true"
-z_elem: 45
-dt: "10secs"
-t_end: "1000secs"
-y_max: 10000.0
-y_elem: 2
+advection_test: true
 turbconv: "edmfx"
-x_elem: 2
-dz_bottom: 30.0
 ode_algo: "SSP33ShuOsher"
+edmfx_upwinding: "first_order"
 config: "box"
-advection_test: true
-kappa_4: 1.0e8
-job_id: "edmfx_adv_test_box"
 moist: "equil"
+hyperdiff: "true"
+kappa_4: 1e8
+x_max: 1e4
+y_max: 1e4
+z_max: 3e4
+x_elem: 2
+y_elem: 2
+z_elem: 45
+dz_bottom: 30.0
+dt: "10secs"
+t_end: "3600secs"
+dt_save_to_disk: "100secs"
+toml: [toml/edmfx_box_advection.toml]
diff --git a/src/prognostic_equations/advection.jl b/src/prognostic_equations/advection.jl
index 9e73101eaa..94d4bbfb49 100644
--- a/src/prognostic_equations/advection.jl
+++ b/src/prognostic_equations/advection.jl
@@ -89,8 +89,9 @@ NVTX.@annotate function explicit_vertical_advection_tendency!(Yₜ, Y, p, t)
     (; ᶜh_totʲs) = n > 0 && is_total_energy ? p : all_nothing
     (; ᶠu³⁰) = advect_tke ? p : all_nothing
     ᶜρa⁰ = advect_tke ? (n > 0 ? p.ᶜρa⁰ : Y.c.ρ) : nothing
+    ᶜρ⁰ = advect_tke ? (n > 0 ? p.ᶜρ⁰ : Y.c.ρ) : nothing
     ᶜtke⁰ = advect_tke ? (n > 0 ? p.ᶜspecific⁰.tke : p.ᶜtke⁰) : nothing
-    ᶜ1 = p.ᶜtemp_scalar
+    ᶜa_scalar = p.ᶜtemp_scalar
     ᶜω³ = p.ᶜtemp_CT3
     ᶠω¹² = p.ᶠtemp_CT12
     ᶠω¹²ʲs = p.ᶠtemp_CT12ʲs
@@ -139,24 +140,28 @@ NVTX.@annotate function explicit_vertical_advection_tendency!(Yₜ, Y, p, t)
 
         # TODO: Move this to implicit_vertical_advection_tendency!.
         for j in 1:n
-            @. ᶜ1[colidx] = one(Y.c.ρ[colidx])
+            @. ᶜa_scalar[colidx] =
+                draft_area(Y.c.sgsʲs.:($$j).ρa[colidx], ᶜρʲs.:($$j)[colidx])
             vertical_transport!(
                 Yₜ.c.sgsʲs.:($j).ρa[colidx],
                 ᶜJ[colidx],
-                Y.c.sgsʲs.:($j).ρa[colidx],
+                ᶜρʲs.:($j)[colidx],
                 ᶠu³ʲs.:($j)[colidx],
-                ᶜ1[colidx],
+                ᶜa_scalar[colidx],
                 dt,
                 edmfx_upwinding,
             )
 
             if :ρae_tot in propertynames(Yₜ.c.sgsʲs.:($j))
+                @. ᶜa_scalar[colidx] =
+                    ᶜh_totʲs.:($$j)[colidx] *
+                    draft_area(Y.c.sgsʲs.:($$j).ρa[colidx], ᶜρʲs.:($$j)[colidx])
                 vertical_transport!(
                     Yₜ.c.sgsʲs.:($j).ρae_tot[colidx],
                     ᶜJ[colidx],
-                    Y.c.sgsʲs.:($j).ρa[colidx],
+                    ᶜρʲs.:($j)[colidx],
                     ᶠu³ʲs.:($j)[colidx],
-                    ᶜh_totʲs.:($j)[colidx],
+                    ᶜa_scalar[colidx],
                     dt,
                     edmfx_upwinding,
                 )
@@ -165,12 +170,15 @@ NVTX.@annotate function explicit_vertical_advection_tendency!(Yₜ, Y, p, t)
             for (ᶜρaχʲₜ, ᶜχʲ, χ_name) in
                 matching_subfields(Yₜ.c.sgsʲs.:($j), ᶜspecificʲs.:($j))
                 χ_name == :e_tot && continue
+                @. ᶜa_scalar[colidx] =
+                    ᶜχʲ[colidx] *
+                    draft_area(Y.c.sgsʲs.:($$j).ρa[colidx], ᶜρʲs.:($$j)[colidx])
                 vertical_transport!(
                     ᶜρaχʲₜ[colidx],
                     ᶜJ[colidx],
-                    Y.c.sgsʲs.:($j).ρa[colidx],
+                    ᶜρʲs.:($j)[colidx],
                     ᶠu³ʲs.:($j)[colidx],
-                    ᶜχʲ[colidx],
+                    ᶜa_scalar[colidx],
                     dt,
                     edmfx_upwinding,
                 )
@@ -179,12 +187,14 @@ NVTX.@annotate function explicit_vertical_advection_tendency!(Yₜ, Y, p, t)
 
         # TODO: Move this to implicit_vertical_advection_tendency!.
         if use_prognostic_tke(turbconv_model) # advect_tke triggers allocations
+            @. ᶜa_scalar[colidx] =
+                ᶜtke⁰[colidx] * draft_area(ᶜρa⁰[colidx], ᶜρ⁰[colidx])
             vertical_transport!(
                 Yₜ.c.sgs⁰.ρatke[colidx],
                 ᶜJ[colidx],
-                ᶜρa⁰[colidx],
+                ᶜρ⁰[colidx],
                 ᶠu³⁰[colidx],
-                ᶜtke⁰[colidx],
+                ᶜa_scalar[colidx],
                 dt,
                 edmfx_upwinding,
             )
diff --git a/toml/edmfx_box.toml b/toml/edmfx_box.toml
index 63ce6f56f8..9eb2be9b12 100644
--- a/toml/edmfx_box.toml
+++ b/toml/edmfx_box.toml
@@ -7,3 +7,9 @@ type = "float"
 alias = "surface_area"
 value = 0.1
 type = "float"
+
+[EDMF_min_area]
+alias = "min_area"
+value = 1.0e-2
+type = "float"
+description = "Minimum area fraction per updraft. Parameter not described in the literature."
diff --git a/toml/edmfx_box_advection.toml b/toml/edmfx_box_advection.toml
new file mode 100644
index 0000000000..d39ecbfaa8
--- /dev/null
+++ b/toml/edmfx_box_advection.toml
@@ -0,0 +1,10 @@
+[EDMF_surface_area]
+alias = "surface_area"
+value = 0
+type = "float"
+
+[EDMF_min_area]
+alias = "min_area"
+value = 1.0e-2
+type = "float"
+description = "Minimum area fraction per updraft. Parameter not described in the literature."