diff --git a/nansat/mappers/mapper_netcdf_cf.py b/nansat/mappers/mapper_netcdf_cf.py
index 637fb938..9b75c4f4 100644
--- a/nansat/mappers/mapper_netcdf_cf.py
+++ b/nansat/mappers/mapper_netcdf_cf.py
@@ -88,6 +88,11 @@ def __init__(self, filename, gdal_dataset, gdal_metadata, *args, **kwargs):
         # Set GCMD/DIF compatible metadata if available
         self._set_time_coverage_metadata(metadata)
 
+        # Add global metadata
+        metadata.pop("title_no", "")
+        metadata.pop("summary_no", "")
+        self.dataset.SetMetadata(metadata)
+
         # Then add remaining GCMD/DIF compatible metadata in inheriting mappers
 
     def times(self):