diff --git a/cime_config/testdefs/testmods_dirs/clm/clm50cam7LndTuningMode/user_nl_datm b/cime_config/testdefs/testmods_dirs/clm/clm50cam7LndTuningMode/user_nl_datm
new file mode 100644
index 0000000000..c35d3fd9d4
--- /dev/null
+++ b/cime_config/testdefs/testmods_dirs/clm/clm50cam7LndTuningMode/user_nl_datm
@@ -0,0 +1,2 @@
+iradsw = -1
+nextsw_cday_calc = "cam7"
diff --git a/cime_config/testdefs/testmods_dirs/clm/clm60cam7LndTuningMode/user_nl_datm b/cime_config/testdefs/testmods_dirs/clm/clm60cam7LndTuningMode/user_nl_datm
new file mode 100644
index 0000000000..c35d3fd9d4
--- /dev/null
+++ b/cime_config/testdefs/testmods_dirs/clm/clm60cam7LndTuningMode/user_nl_datm
@@ -0,0 +1,2 @@
+iradsw = -1
+nextsw_cday_calc = "cam7"