********************************************************************** *** Atmospheric CH4 concentrations (ppbv) derived from flask *** *** samples collected at Cape Grim, Tasmania *** *** Source: L.P. Steele *** *** P.B. Krummel *** *** R.L. Langenfelds *** *** Commonwealth Scientific, *** *** and Industrial Research Organisation, *** *** Aspendale, Victoria, *** *** Australia 3195 *** *** *** *** January 2003 *** *** *** ********************************************************************** Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Ave 1984 1588.58 1585.29 1582.35 1575.01 1985 1566.94 1562.5 1563.13 1570.25 1578.18 1582.25 1589.63 1597.64 1599.59 1599.56 1595.31 1586.19 1582.5975 1986 1580.58 1579.74 1580.18 1585.26 1592.75 1598.69 1605.88 1611.62 1613.33 1612.53 1609.29 1602.9 1597.729167 1987 1595.15 1591.49 1592.66 1599.9 1608.91 1613.29 1619.01 1624.88 1626.27 1626.13 1623.44 1617.21 1611.528333 1988 1609.48 1602.34 1602.55 1609.79 1616.65 1622.73 1629.49 1634.47 1637.55 1637.53 1631.5 1623.4 1621.456667 1989 1621.15 1622.35 1620.26 1621.52 1629.32 1637.09 1643.25 1647.67 1648.75 1647.67 1643.9 1636.43 1634.946667 1990 1628.16 1623.9 1625.02 1630.35 1638.66 1645.67 1650.31 1653.91 1655.74 1655.69 1653.04 1645.07 1642.126667 1991 1635.1 1632.05 1633.98 1639.42 1648.67 1655.34 1660.95 1665.22 1668.51 1674.01 1670.72 1660.59 1653.713333 1992 1654.74 1652.61 1653.08 1656.45 1662.49 1669.45 1675.51 1680.11 1681.66 1677.81 1672.1 1666.22 1666.8525 1993 1656.52 1651.11 1653.02 1658.66 1665.84 1671.43 1675.99 1680.6 1682.31 1680.7 1676.26 1669.54 1668.498333 1994 1661.46 1655.81 1655.5 1660.84 1669.67 1677.14 1682.69 1686.24 1686.6 1687.18 1684.16 1676.4 1673.640833 1995 1669.46 1665.27 1664.13 1667.67 1674.79 1680.88 1685.5 1691.02 1694.26 1692.99 1689.57 1682.48 1679.835 1996 1672.89 1666.39 1664.42 1669.37 1677.78 1683.22 1688.26 1694.01 1694.96 1692.64 1689.14 1681.95 1681.2525 1997 1673.97 1670.99 1674.76 1679.34 1684.84 1691.89 1696.85 1701.45 1702.57 1699.6 1695.19 1690.41 1688.488333 1998 1684.12 1678.28 1676.49 1680.15 1689.29 1698.11 1703.22 1708.23 1712.17 1711.84 1707.3 1700.16 1695.78 1999 1693.24 1689.18 1689 1693.78 1701.82 1709.48 1715.03 1718.27 1720.33 1720.53 1715.01 1705.88 1705.9625 2000 1697.24 1691.45 1691.92 1697.94 1704.4 1711.54 1717.16 1719.1 1720.02 1719.52 1714.86 1706.24 1707.615833 2001 1696.38 1690.17 1690.29 1694.8 1702.64 1710.85 1716.44 1719.52 1720.71 1718.07 1711.32 1703.38 1706.214167 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.