********************************************************************* *** Atmospheric Carbon Dioxide Mixing Ratios from the *** *** NOAA CMDL Carbon Cycle Cooperative Global Air Sampling *** *** Network, 1968-2002 *** *** *** *** March 2005 *** *** *** *** Source: Thomas J. Conway *** *** Pieter P. Tans *** *** NOAA Climate Monitoring and Diagnostics Laboratory *** *** 325 Broadway *** *** Boulder, Colorado, U.S.A. *** ********************************************************************* Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 1994 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 374.32 -99.99 1995 370.44 368.86 368.90 366.77 363.09 356.59 352.93 354.22 357.86 363.68 365.71 366.35 362.95 1996 368.65 369.16 368.90 370.32 368.81 360.55 353.29 350.79 354.00 360.94 365.19 368.21 363.23 1997 369.98 370.36 370.91 369.95 368.73 365.25 355.72 352.22 359.41 366.46 370.50 370.85 365.86 1998 370.44 372.34 372.83 370.81 367.86 366.77 360.32 356.18 364.05 369.18 371.05 373.61 367.95 1999 375.34 375.70 376.32 375.78 372.26 365.66 356.71 354.16 363.32 372.36 376.64 379.64 370.32 2000 378.03 378.37 380.46 378.61 374.59 368.99 363.81 358.94 362.21 373.68 377.76 375.90 372.61 2001 379.72 382.54 382.16 380.42 374.57 367.50 365.48 363.29 364.92 374.77 378.14 376.88 374.20 2002 379.37 380.11 381.94 384.74 379.90 369.62 364.11 364.49 371.30 377.18 381.01 384.18 376.50 Monthly measurements are reported in parts per million (ppm) and are directly traceable to the WMO CO2 mole fraction scale. Annual values are the arithmetic means of the 12 monthly values.