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*** Atmospheric CH4 concentrations (ppbv) derived from flask       ***
*** samples collected at Macquarie Island, Australia               ***
*** 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 Ave

1990					1637.61	1647.24	1652.95	1656.86	1661.99	1659.04	1651.72	1644.73	
1991	1635.99	1631	1631.72	1641.52	1655.78	1657.88	1658.46	1665.96	1668.99	1669.72	1669.23	1664.16	1654.20
1992	1656.28	1651.94	1652.59	1655.6	1661.97	1671.06	1677.69	1679.67	1680.76	1678.69	1673.08	1666	1667.11
1993	1657.84	1652.61	1653.84	1659.79	1666.61	1673.3	1677.88	1680.72	1683	1682.07	1676.11	1667.74	1669.29
1994	1659.8	1655.1	1655.5	1660.94	1668.5	1673.73	1678.95	1685.05	1687.96	1687.52	1684.18	1677.31	1672.88
1995	1670.25	1666.16	1664.15	1668.4	1676.93	1681.15	1686	1690.67	1692.27	1693.58	1690.56	1683.33	1680.29
1996	1674.23	1666.48	1664.74	1669.85	1676.55	1684.57	1691.33	1693.14	1694.17	1693.52	1689.29	1682.82	1681.72
1997	1674.72	1669.96	1672.63	1681.08	1687.02	1690.17	1696.65	1701.77	1702.15	1700.54	1697.27	1689.92	1688.66
1998	1681.04	1676.57	1676.35	1679.65	1687.97	1695.96	1702.18	1708.64	1712.06	1711.6	1707.64	1700.63	1695.02
1999	1692.17	1687.05	1688.43	1694.62	1703.17	1711.26	1715.19	1717.43	1719.85	1718.81	1714.37	1707.93	1705.86
2000	1699.03	1692.01	1691.44	1697.44	1705.42	1711.59	1716.46	1721.13	1722.88	1719.84	1713.99	1705.77	1708.08
2001	1696.65	1690.25	1689.98	1697.44	1704.28	1709.11	1716.83	1720.68	1720.28	1719.92	1715.34	1705.63	1707.20

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.