diff --git a/da/tools/io4.py b/da/tools/io4.py
index 23742603d1dcb9fa6228a8c379b0e67582e3dda9..810293bb3a8c7139b487ce226e9ae5c91abd970a 100755
--- a/da/tools/io4.py
+++ b/da/tools/io4.py
@@ -35,7 +35,7 @@ email = "wouter.peters@wur.nl"
 url = "http://carbontracker.wur.nl"
 institution = "Wageningen University and Research Center"
 source = "CarbonTracker release 2.0"
-conventions = "CF-1.1"
+conventions = "CF-1.8"
 historytext = 'created on '+dt.datetime.now().strftime('%B %d, %Y')+' by %s'%os.environ['USER']
 
 std_savedict={'name':'unknown','values':[],'dims':(0,0,),'units':'','long_name':'','comment':''}
@@ -85,13 +85,13 @@ class CT_CDF(netCDF4.Dataset):
     def add_tc_header(self):
 
         #
-        self.setncattr('Institution',institution)
-        self.setncattr('Contact',email)
+        self.setncattr('institution',institution)
+        self.setncattr('contact',email)
         self.setncattr('URL',url)
-        self.setncattr('Source',source)
-        self.setncattr('Convention',conventions)
-        self.setncattr('Disclaimer',disclaimer)
-        self.setncattr('History',historytext)
+        self.setncattr('source',source)
+        self.setncattr('Conventions',conventions)
+        self.setncattr('disclaimer',disclaimer)
+        self.setncattr('history',historytext)
 
     def add_params_dim(self,nparams):