********************************************************************* *** 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 1995 -99.99 -99.99 369.41 368.66 364.61 360.88 355.98 355.21 358.55 366.69 372.68 374.35 -99.99 1996 377.54 380.50 378.63 371.99 364.66 361.08 359.95 359.52 365.31 374.47 376.27 377.65 370.63 1997 380.53 376.85 372.89 370.91 367.17 362.95 360.11 360.22 363.53 373.54 380.28 378.42 370.62 1998 375.15 374.81 372.69 373.21 373.87 367.34 361.74 360.33 366.01 373.38 380.09 386.96 372.13 1999 383.02 381.54 382.92 377.94 373.43 373.16 372.53 370.67 371.50 372.17 379.12 389.45 377.29 2000 387.89 381.24 381.25 378.78 372.90 369.95 370.58 373.99 374.06 375.02 380.86 385.97 377.71 2001 384.38 381.98 382.74 378.61 372.64 370.27 368.49 370.73 372.66 376.11 383.64 388.00 377.52 2002 386.74 383.92 383.90 381.39 376.72 377.87 376.23 371.51 374.86 380.33 381.73 384.68 379.99 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.