Background atmospheric CO₂ mixing ratios from individual flask air samples for Mould Bay, Northwest Territories, Canada. 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 for Mould Bay, Northwest Territories, Canada, expressed in parts per million
(ppm) and reported in 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




1980    -99.99     -99.99   -99.99     344.00   343.91    343.07    338.60   333.49   333.57     337.00   340.02    342.67   -99.99
1981    344.12     344.85   345.47     345.85   346.69    346.10    339.43   332.56   333.92     338.38   341.33    344.05   341.90
1982    346.10     346.90   347.05     347.24   347.54    345.77    339.90   334.24   333.41     337.24   340.81    344.21   342.53
1983    346.55     347.02   347.52     347.81   347.86    346.43    340.51   334.44   334.97     339.61   344.36    347.48   343.71
1984    349.36     350.14   349.80     349.74   350.16    348.02    342.31   336.74   337.13     341.33   344.97    347.91   345.63
1985    349.27     349.40   350.44     351.44   351.92    349.73    343.96   338.31   338.55     343.08   347.03    349.37   346.88
1986    351.43     352.62   353.04     353.14   353.36    352.09    346.52   340.32   339.83     344.34   348.57    351.45   348.89
1987    353.20     353.06   353.84     354.58   354.58    353.09    347.56   341.36   340.77     345.63   349.91    352.88   350.04
1988    355.62     356.19   356.78     357.55   357.26    355.14    348.88   343.67   345.10     350.21   354.77    359.67   353.40
1989    360.89     359.82   359.45     359.43   359.19    357.54    351.70   345.63   345.99     351.26   355.42    358.82   355.43
1990    359.84     360.49   361.78     361.13   360.46    357.97    351.54   346.45   347.49     351.79   355.26    358.93   356.09
1991    362.45     362.43   361.75     362.17   361.70    359.64    354.02   347.61   348.25     353.13   357.70    360.80   357.64
1992    362.01     361.82   361.95     362.26   362.59    360.45    353.12   347.00   347.67     352.28   356.94    360.97   357.42
1993    362.65     362.03   362.73     363.16   362.87    360.98    353.64   347.53   348.28     352.83   357.43    359.46   357.80