diff --git a/settings/SETTINGS_aer_config b/settings/SETTINGS_aer_config
index 22b28ca62d2f3f4230c0788d78400708b9d1799f..130c0a1d27581e2dbbd514e0b9350d5f3c6313d7 100644
--- a/settings/SETTINGS_aer_config
+++ b/settings/SETTINGS_aer_config
@@ -43,10 +43,6 @@ maxiter:    10
 # Optimize ocean boxes (true or false)
 inc_ocean:  .false.
 
-# Optimize initial mixing ratios (true or false)
-# (not relevant for aerosols)
-opt_cini:    .false.
-
 # Use spatial correlation in error covariance matrix (true or false)
 # if use regions based ecosystems then should be false
 spa_corr:   .true.
@@ -120,10 +116,6 @@ nstep_flx:   720
 # Measurement error: unit same as obs 
 measerr:     100.0
 
-# Initial mixing ratio error: fraction
-# (not relevant for aerosols)
-cinierr:     0.005
-
 # Prior flux error: fraction
 flxerr:      0.5
 
@@ -131,7 +123,7 @@ flxerr:      0.5
 flxerr_ll:   1.e-8
 
 # Spatial correlation length for land: unit (km)
-sigma_land:  250.
+sigma_land:  100.
 
 # Spatial correlation length for ocean: unit (km)
 sigma_ocean: 1000.
diff --git a/settings/SETTINGS_ch4sat_config b/settings/SETTINGS_ch4sat_config
index 5f08c67a70b153067bbeb4568772a56446d63451..5b1a369b97c9d532c9071fb93b951ab6bdebdf6a 100644
--- a/settings/SETTINGS_ch4sat_config
+++ b/settings/SETTINGS_ch4sat_config
@@ -141,6 +141,9 @@ sigma_ocean: 1000.
 # Temporal correlation length: unit (days)
 sigmatime:   90.
 
+# Temporal correlation length for scalars of initial mixing ratios: unit (days)
+sigmatime_cini: 30.
+
 # Total error for inversion domain (Tg/y)
 globerr:     100.
 
diff --git a/settings/SETTINGS_co2_config b/settings/SETTINGS_co2_config
index 5d7e73b3e9d3dd3a13646025acf62203b9b53c50..b44075636d9d7257c57dbd845e8b8a7990ef8d89 100644
--- a/settings/SETTINGS_co2_config
+++ b/settings/SETTINGS_co2_config
@@ -159,6 +159,9 @@ sigma_ocean: 2000.
 # Temporal correlation length: unit (days)
 sigmatime:   30.
 
+# Temporal correlation length for scalars of initial mixing ratios: unit (days)
+sigmatime_cini: 30.
+
 # Total error for domain (Tg/y)
 # globerr <= 0: prior error covariance matrix not scaled
 globerr:     300.
diff --git a/settings/SETTINGS_ghg_config b/settings/SETTINGS_ghg_config
index ed3eb4077a016c8ba0b34609a1d31c55c5e92bba..ab9bd08a9d0394cba613904e3799c4fa40bc53bd 100644
--- a/settings/SETTINGS_ghg_config
+++ b/settings/SETTINGS_ghg_config
@@ -140,6 +140,9 @@ sigma_ocean: 1000.
 # Temporal correlation length: unit (days)
 sigmatime:   30.
 
+# Temporal correlation length for scalars of initial mixing ratios: unit (days)
+sigmatime_cini: 30.
+
 # Total error for inversion domain (Tg/y)
 # globerr <= 0: prior error covariance matrix not scaled
 globerr:     10.