Background atmospheric CO₂ mixing ratios from individual flask air samples for the Baltic Sea. Only measurements satisfying the data selection criteria fro background measurements are plotted. Consecutive background measurements are joined by lines. Background measurements interrupted by non-background measurements are not joined by lines.

Monthly atmospheric CO2 mixing ratios from air samples collected on a ferry in the Baltic Sea.  These mixing ratios
are expressed in parts per million (ppm) relative to the Scripps Institution of Oceanography X93 manometric mole
fraction scale.  Annual values were calculated by CDIAC for years with complete records.  Missing values are
denoted by -99.99.



Year      Jan 	     Feb      Mar	April	  May	   June	     July      Aug     Sept	  Oct 	   Nov       Dec     Ann




1992    -99.99     -99.99   -99.99     -99.99   -99.99    -99.99    -99.99   -99.99   353.50     359.45   360.97    359.97   -99.99
1993    362.37     365.30   365.64     363.02   357.94    355.12    355.53   352.54   351.16     358.55   365.98    366.88   360.00