diff --git a/config/amip_configs/amip.yml b/config/amip_configs/amip.yml
index 88b3437062..5bb754c729 100644
--- a/config/amip_configs/amip.yml
+++ b/config/amip_configs/amip.yml
@@ -17,11 +17,13 @@ mode_name: "amip"
 mono_surface: false
 netcdf_output_at_levels: true
 output_default_diagnostics: true
+rayleigh_sponge: true
 start_date: "20100101"
 surface_setup: "PrescribedSurface"
 t_end: "1098days"
 topo_smoothing: true
 topography: "Earth"
 turb_flux_partition: "CombinedStateFluxesMOST"
+viscous_sponge: false
 z_elem: 63
 z_max: 55000.0
diff --git a/toml/amip.toml b/toml/amip.toml
index cb7583bf56..19c521eb48 100644
--- a/toml/amip.toml
+++ b/toml/amip.toml
@@ -4,6 +4,9 @@ value = 10.0
 [zd_rayleigh]
 value = 35000.0
 
+[zd_viscous]
+value = 35000.0
+
 [precipitation_timescale]
 value = 600