**********************************************************************
*** Atmospheric CH4 concentrations (ppbv) derived from flask       ***
*** samples collected at South Pole, Antarctica                    ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R.L. Langenfelds                                  ***
***              Commonwealth Scientific,                          ***
***              and Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** January 2003                                                   ***
***                                                                ***
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Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann Avg

1991			1634.4	1636.5	1642.84	1651.65	1658.75	1663.96	1668.45	1669.65	1665.92	1661.58	
1992	1657.54	1652.78	1652.08	1656.65	1663.04	1669.24	1675.2	1680.88	1682.99	1680.47	1674.76	1667.3	1667.74
1993	1658.15	1652.47	1653.24	1655.94	1661.69	1670.26	1676.07	1678.28	1681.23	1681.43	1675.03	1668.5	1667.69
1994	1661.5	1655.28	1654.97	1658.3	1663.08	1671.59	1679.83	1683.9	1686.25	1686.99	1683.76	1677.71	1671.93
1995	1670.6	1664.28	1663.51	1668.74	1671.87	1676.08	1684.31	1688.88	1691.14	1692.92	1689.46	1682.69	1678.71
1996	1674.25	1667.24	1666.59	1670	1675.02	1681.53	1688.08	1693	1694.58	1694.29	1689.99	1680.12	1681.22
1997	1671.66	1669.46	1672.13	1676.28	1681.44	1689.3	1695.4	1699.43	1701.84	1700.8	1696.58	1690.55	1687.07
1998	1683.82	1678.53	1677.3	1680.12	1686.17	1694.45	1701.82	1707.33	1710.88	1711.67	1707.23	1699.51	1694.90
1999	1692.93	1689.21	1688.78	1692.26	1699.7	1707.08	1712.81	1717.56	1719.55	1718.61	1715.07	1707.5	1705.09
2000	1698.7	1692.65	1690.66	1693.88	1700.6	1707.65	1713.63	1719.58	1721.54	1717.95	1712.37	1705.31	1706.21
2001	1697.4	1692.24	1690.38	1693.33	1701.85	1709.68	1714.58	1719.47	1721.71	1718.79	1713.73	1706.13	1706.61

Monthly values are expressed in parts per billion by volume (ppbv) and reported in the CSIRO94 CH4 Scale 
[Steele, et al., 1996, pp. 107-110, in: Baseline Atmospheric Program (Australia) 1994-95, edited 
by R.J.Francey, A.L. Dick, and N. Derek]. Monthly values are calculated as the mean of the daily values 
from a smooth curve fit to the data using curve-fitting routines described by Thoning et al., 1989 
(J. Geophys. Res. 94, 8549-8565). Annual values are the arithmetic means of the 12 monthly values.