********************************************************************* *** 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 1992 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 356.81 352.94 349.84 353.58 358.36 359.28 -99.99 1993 360.67 363.51 363.68 363.01 359.14 357.81 355.62 351.39 354.95 357.64 359.59 364.72 359.31 1994 364.67 363.00 364.94 365.89 362.95 361.15 357.41 351.28 354.15 363.09 369.85 373.61 362.67 1995 371.77 367.67 366.54 366.84 363.36 360.89 361.53 356.14 353.82 361.16 368.39 374.55 364.39 1996 374.25 371.53 370.03 370.45 369.32 363.16 358.81 358.17 360.65 364.63 368.43 370.06 366.62 1997 370.51 370.82 370.93 369.95 367.48 364.92 359.98 355.64 361.65 369.86 371.72 370.40 366.99 1998 370.25 371.87 372.09 370.07 370.36 369.08 366.44 365.18 364.74 370.47 376.64 377.07 370.36 1999 375.96 375.93 376.87 375.08 370.53 369.58 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 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.