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Air Curve
Atmospheric mixing ratios of CFC-11, CFC-12, CFC-113,CFC-13 x 100, SF6 x 100, and SF5CF3 x 1000 for Northern Hemisphere atmosphere.
Data for the construction of the mixing ratios in this figure were obtained from the CMDL/NOAA website URL http://www.cmdl.noaa.gov/ (Elkins, Butler, Thompson, and Montzka, 2003; Montzka et al., 1996 and 1999), from the CDIAC website URL http://cdiac.esd.ornl.gov/ (Walker et al., 2000; Prinn et al., 2000; Cunnold et al., 1997). Data that was used to construct the Northern Hemisphere 1980 to 1990 atmospheric concentrations for CFC-113 were obtained from a number of sources (Busenberg and Plummer, 1993; Wisegarver and Gammon, 1988; Gilpin, 1991; Wang 1993 and 1997; and Tominaga, 1993). The pre-1980's mixing ratios were reconstructed from production and atmospheric release data (Fisher and Midgley, 1993; and AFEAS, 2003, http://www.afeas.org/ ).
Data Table
Atmospheric mixing ratios of CFC-11, CFC-12, CFC-13, CFC-113, SF6 and SF5CF3 in North America (NH) and CFCs in Southern Hemisphere (SH) air compiled by the U.S. Geological Survey Chlorofluorocarbon Laboratory.
CFC-11, CFC-12, CFC-113 mixing ratios are in parts per trillion (ppt) and on the SIO-2005 scale. SF6 mixing ratios are in parts per trillion (ppt) and are on the NOAA 2000, 2006 scale. CFC-13 and SF5CF3 mixing ratios are in parts per trillion (ppt).
NH revised July 2009
SH revised July 2009
| Year |
NH
|
NH
|
NH
|
NH
|
NH
|
NH
|
SH
|
SH
|
SH
|
SH
|
|
CFC-12
|
CFC-11
|
CFC-113
|
CFC-13
|
SF6
|
SF5CF3
|
CFC-12
|
CFC-11
|
CFC-113
|
SF6
|
|
| 1940.0 | 0.34 | 0.01 | 0.00 | 0 | 0.05 | 0 | 0.25 | 0.00 | 0.00 | 0.05 |
| 1940.5 | 0.40 | 0.01 | 0.00 | 0 | 0.05 | 0 | 0.30 | 0.00 | 0.00 | 0.05 |
| 1941.0 | 0.48 | 0.02 | 0.00 | 0 | 0.05 | 0 | 0.35 | 0.00 | 0.00 | 0.05 |
| 1941.5 | 0.56 | 0.02 | 0.00 | 0 | 0.05 | 0 | 0.40 | 0.00 | 0.00 | 0.05 |
| 1942.0 | 0.66 | 0.02 | 0.00 | 0 | 0.05 | 0 | 0.45 | 0.00 | 0.00 | 0.05 |
| 1942.5 | 0.76 | 0.02 | 0.00 | 0 | 0.05 | 0 | 0.50 | 0.00 | 0.00 | 0.05 |
| 1943.0 | 0.88 | 0.03 | 0.00 | 0 | 0.05 | 0 | 0.60 | 0.00 | 0.00 | 0.05 |
| 1943.5 | 1.01 | 0.03 | 0.01 | 0 | 0.05 | 0 | 0.70 | 0.00 | 0.00 | 0.05 |
| 1944.0 | 1.18 | 0.04 | 0.01 | 0 | 0.05 | 0 | 0.80 | 0.00 | 0.00 | 0.05 |
| 1944.5 | 1.34 | 0.04 | 0.03 | 0 | 0.05 | 0 | 0.90 | 0.00 | 0.00 | 0.05 |
| 1945.0 | 1.56 | 0.05 | 0.04 | 0 | 0.05 | 0 | 1.05 | 0.00 | 0.00 | 0.05 |
| 1945.5 | 1.77 | 0.05 | 0.06 | 0 | 0.05 | 0 | 1.20 | 0.00 | 0.00 | 0.05 |
| 1946.0 | 2.15 | 0.07 | 0.07 | 0 | 0.05 | 0 | 1.45 | 0.05 | 0.00 | 0.05 |
| 1946.5 | 2.53 | 0.08 | 0.09 | 0 | 0.05 | 0 | 1.70 | 0.10 | 0.00 | 0.05 |
| 1947.0 | 3.11 | 0.11 | 0.11 | 0 | 0.05 | 0 | 2.05 | 0.11 | 0.00 | 0.05 |
| 1947.5 | 3.70 | 0.14 | 0.13 | 0 | 0.05 | 0 | 2.40 | 0.12 | 0.00 | 0.05 |
| 1948.0 | 4.37 | 0.20 | 0.15 | 0 | 0.05 | 0 | 2.90 | 0.16 | 0.00 | 0.05 |
| 1948.5 | 5.04 | 0.25 | 0.17 | 0 | 0.05 | 0 | 3.40 | 0.20 | 0.00 | 0.05 |
| 1949.0 | 5.76 | 0.34 | 0.20 | 0 | 0.05 | 0 | 4.05 | 0.25 | 0.00 | 0.05 |
| 1949.5 | 6.48 | 0.42 | 0.22 | 0 | 0.05 | 0 | 4.70 | 0.30 | 0.00 | 0.05 |
| 1950.0 | 7.28 | 0.55 | 0.25 | 0 | 0.05 | 0 | 5.35 | 0.35 | 0.00 | 0.05 |
| 1950.5 | 8.07 | 0.67 | 0.28 | 0 | 0.05 | 0 | 6.00 | 0.40 | 0.00 | 0.05 |
| 1951.0 | 8.93 | 0.85 | 0.31 | 0 | 0.05 | 0 | 6.70 | 0.55 | 0.00 | 0.05 |
| 1951.5 | 9.80 | 1.02 | 0.34 | 0 | 0.05 | 0 | 7.40 | 0.70 | 0.00 | 0.05 |
| 1952.0 | 10.7 | 1.27 | 0.37 | 0 | 0.05 | 0 | 8.2 | 0.85 | 0.00 | 0.05 |
| 1952.5 | 11.6 | 1.52 | 0.41 | 0 | 0.05 | 0 | 9.0 | 1.00 | 0.00 | 0.05 |
| 1953.0 | 12.6 | 1.87 | 0.44 | 0 | 0.05 | 0 | 9.9 | 1.25 | 0.00 | 0.05 |
| 1953.5 | 13.6 | 2.20 | 0.49 | 0 | 0.05 | 0 | 10.7 | 1.50 | 0.00 | 0.05 |
| 1954.0 | 14.7 | 2.63 | 0.53 | 0 | 0.06 | 0 | 11.7 | 1.85 | 0.00 | 0.05 |
| 1954.5 | 15.9 | 3.04 | 0.58 | 0 | 0.06 | 0 | 12.6 | 2.20 | 0.00 | 0.05 |
| 1955.0 | 17.1 | 3.56 | 0.63 | 0 | 0.06 | 0 | 13.7 | 2.60 | 0.00 | 0.05 |
| 1955.5 | 18.4 | 4.07 | 0.69 | 0 | 0.06 | 0 | 14.7 | 3.00 | 0.00 | 0.06 |
| 1956.0 | 19.9 | 4.71 | 0.75 | 0 | 0.06 | 0 | 15.9 | 3.50 | 0.00 | 0.06 |
| 1956.5 | 21.4 | 5.35 | 0.81 | 0 | 0.06 | 0 | 17.1 | 4.00 | 0.00 | 0.06 |
| 1957.0 | 23.1 | 6.06 | 0.88 | 0 | 0.06 | 0 | 18.5 | 4.60 | 0.00 | 0.06 |
| 1957.5 | 24.7 | 6.77 | 0.95 | 0 | 0.06 | 0 | 19.9 | 5.20 | 0.00 | 0.06 |
| 1958.0 | 26.5 | 7.42 | 1.03 | 0 | 0.06 | 0 | 21.5 | 5.85 | 0.00 | 0.06 |
| 1958.5 | 28.3 | 8.06 | 1.11 | 0 | 0.06 | 0 | 23.0 | 6.50 | 0.00 | 0.06 |
| 1959.0 | 30.2 | 8.72 | 1.19 | 0 | 0.06 | 0 | 24.7 | 7.15 | 0.00 | 0.06 |
| 1959.5 | 32.2 | 9.37 | 1.29 | 0 | 0.06 | 0 | 26.3 | 7.80 | 0.00 | 0.06 |
| 1960.0 | 34.5 | 10.2 | 1.39 | 0 | 0.07 | 0 | 28.2 | 8.5 | 0.00 | 0.06 |
| 1960.5 | 36.9 | 11.1 | 1.50 | 0 | 0.07 | 0 | 30.1 | 9.2 | 0.00 | 0.06 |
| 1961.0 | 39.5 | 12.2 | 1.61 | 0 | 0.07 | 0 | 32.3 | 10.1 | 0.04 | 0.06 |
| 1961.5 | 42.1 | 13.3 | 1.74 | 0 | 0.08 | 0 | 34.4 | 10.9 | 0.07 | 0.07 |
| 1962.0 | 45.1 | 14.8 | 1.86 | 0 | 0.08 | 0 | 36.9 | 12.0 | 0.09 | 0.07 |
| 1962.5 | 48.1 | 16.2 | 2.00 | 0 | 0.08 | 0 | 39.4 | 13.1 | 0.10 | 0.07 |
| 1963.0 | 51.6 | 17.9 | 2.15 | 0 | 0.09 | 0 | 42.3 | 14.5 | 0.20 | 0.08 |
| 1963.5 | 55.1 | 19.7 | 2.32 | 0 | 0.10 | 0 | 45.1 | 15.8 | 0.30 | 0.08 |
| 1964.0 | 59.2 | 21.7 | 2.49 | 0 | 0.10 | 0 | 48.5 | 17.5 | 0.40 | 0.08 |
| 1964.5 | 63.3 | 23.8 | 2.67 | 0 | 0.11 | 0 | 51.8 | 19.2 | 0.50 | 0.09 |
| 1965.0 | 67.9 | 26.1 | 2.86 | 0 | 0.12 | 0 | 55.7 | 21.2 | 0.65 | 0.10 |
| 1965.5 | 72.5 | 28.4 | 3.08 | 0 | 0.13 | 0.001 | 59.5 | 23.1 | 0.80 | 0.10 |
| 1966.0 | 77.6 | 31.0 | 3.29 | 0 | 0.14 | 0.002 | 63.8 | 25.4 | 0.95 | 0.11 |
| 1966.5 | 82.8 | 33.6 | 3.54 | 0 | 0.15 | 0.002 | 68.1 | 27.6 | 1.10 | 0.12 |
| 1967.0 | 88.5 | 36.5 | 3.79 | 0 | 0.16 | 0.003 | 73.0 | 30.2 | 1.30 | 0.13 |
| 1967.5 | 94.3 | 39.5 | 4.07 | 0 | 0.18 | 0.003 | 77.9 | 32.7 | 1.50 | 0.14 |
| 1968.0 | 100.7 | 42.8 | 4.35 | 0 | 0.19 | 0.003 | 83.4 | 35.5 | 1.75 | 0.15 |
| 1968.5 | 107.2 | 46.1 | 4.67 | 0 | 0.20 | 0.004 | 88.8 | 38.3 | 2.00 | 0.16 |
| 1969.0 | 114.4 | 50.0 | 5.00 | 0.13 | 0.21 | 0.004 | 94.9 | 41.6 | 2.30 | 0.18 |
| 1969.5 | 121.5 | 53.8 | 5.37 | 0.20 | 0.22 | 0.005 | 101.0 | 44.8 | 2.60 | 0.19 |
| 1970.0 | 129.3 | 58.2 | 5.75 | 0.26 | 0.23 | 0.005 | 107.9 | 48.6 | 2.95 | 0.20 |
| 1970.5 | 137.2 | 62.5 | 6.17 | 0.33 | 0.25 | 0.006 | 114.7 | 52.3 | 3.30 | 0.21 |
| 1971.0 | 145.5 | 67.3 | 6.60 | 0.39 | 0.26 | 0.006 | 122.2 | 56.5 | 3.70 | 0.22 |
| 1971.5 | 153.9 | 72.1 | 7.08 | 0.46 | 0.27 | 0.007 | 129.6 | 60.7 | 4.10 | 0.23 |
| 1972.0 | 162.9 | 77.4 | 7.57 | 0.52 | 0.28 | 0.007 | 137.6 | 65.4 | 4.55 | 0.25 |
| 1972.5 | 172.0 | 82.8 | 8.14 | 0.59 | 0.30 | 0.008 | 145.6 | 70.0 | 5.00 | 0.26 |
| 1973.0 | 182.0 | 88.9 | 8.69 | 0.65 | 0.32 | 0.009 | 154.4 | 75.2 | 5.55 | 0.27 |
| 1973.5 | 192.1 | 95.0 | 9.33 | 0.72 | 0.34 | 0.010 | 163.2 | 80.4 | 6.10 | 0.28 |
| 1974.0 | 202.9 | 101.6 | 9.97 | 0.79 | 0.36 | 0.010 | 172.9 | 86.3 | 6.75 | 0.30 |
| 1974.5 | 213.7 | 108.3 | 10.7 | 0.85 | 0.39 | 0.011 | 182.5 | 92.2 | 7.4 | 0.32 |
| 1975.0 | 224.0 | 113.9 | 11.4 | 0.92 | 0.42 | 0.012 | 192.7 | 98.5 | 8.1 | 0.34 |
| 1975.5 | 234.3 | 121.4 | 12.3 | 0.98 | 0.45 | 0.013 | 202.9 | 104.7 | 8.8 | 0.36 |
| 1976.0 | 244.2 | 128.2 | 13.1 | 1.05 | 0.48 | 0.014 | 213.0 | 110.9 | 9.6 | 0.39 |
| 1976.5 | 254.0 | 134.4 | 14.1 | 1.11 | 0.52 | 0.015 | 223.1 | 117.1 | 10.4 | 0.42 |
| 1977.0 | 263.3 | 141.3 | 15.0 | 1.18 | 0.55 | 0.017 | 232.9 | 123.2 | 11.3 | 0.45 |
| 1977.5 | 272.5 | 145.9 | 16.2 | 1.24 | 0.59 | 0.018 | 242.6 | 129.3 | 12.2 | 0.48 |
| 1978.0 | 282.4 | 149.1 | 17.3 | 1.31 | 0.63 | 0.019 | 251.9 | 135.1 | 13.3 | 0.52 |
| 1978.5 | 292.9 | 155.6 | 18.5 | 1.38 | 0.68 | 0.021 | 261.1 | 140.8 | 14.3 | 0.55 |
| 1979.0 | 298.1 | 158.9 | 19.8 | 1.44 | 0.73 | 0.022 | 267.3 | 144.8 | 15.5 | 0.59 |
| 1979.5 | 301.2 | 161.7 | 21.2 | 1.51 | 0.77 | 0.023 | 273.5 | 148.8 | 16.6 | 0.63 |
| 1980.0 | 311.2 | 167.7 | 22.7 | 1.57 | 0.83 | 0.025 | 282.9 | 154.1 | 18.0 | 0.68 |
| 1980.5 | 317.4 | 171.9 | 24.3 | 1.64 | 0.88 | 0.027 | 292.3 | 159.3 | 19.3 | 0.73 |
| 1981.0 | 322.7 | 175.0 | 25.8 | 1.70 | 0.94 | 0.029 | 300.6 | 163.6 | 20.8 | 0.77 |
| 1981.5 | 333.8 | 178.7 | 27.5 | 1.77 | 0.99 | 0.030 | 308.8 | 167.8 | 22.2 | 0.83 |
| 1982.0 | 343.6 | 182.8 | 29.1 | 1.83 | 1.05 | 0.032 | 317.2 | 172.0 | 23.8 | 0.88 |
| 1982.5 | 352.7 | 187.3 | 30.9 | 1.90 | 1.12 | 0.034 | 325.5 | 176.1 | 25.3 | 0.94 |
| 1983.0 | 361.6 | 192.2 | 32.7 | 1.96 | 1.18 | 0.036 | 334.0 | 180.3 | 26.7 | 0.99 |
| 1983.5 | 372.2 | 196.9 | 34.9 | 2.03 | 1.25 | 0.038 | 342.5 | 184.5 | 28.1 | 1.05 |
| 1984.0 | 378.6 | 200.8 | 37.2 | 2.10 | 1.32 | 0.041 | 351.0 | 188.5 | 29.8 | 1.12 |
| 1984.5 | 386.2 | 204.9 | 39.9 | 2.16 | 1.39 | 0.043 | 359.4 | 192.5 | 31.4 | 1.18 |
| 1985.0 | 395.4 | 210.1 | 42.5 | 2.23 | 1.47 | 0.045 | 368.8 | 197.4 | 33.7 | 1.25 |
| 1985.5 | 403.3 | 216.1 | 45.4 | 2.29 | 1.54 | 0.047 | 378.2 | 202.2 | 36.0 | 1.32 |
| 1986.0 | 414.6 | 221.8 | 48.2 | 2.36 | 1.62 | 0.050 | 387.4 | 206.9 | 38.5 | 1.39 |
| 1986.5 | 423.5 | 226.7 | 51.3 | 2.42 | 1.70 | 0.052 | 396.5 | 211.5 | 41.0 | 1.47 |
| 1987.0 | 433.6 | 232.2 | 54.5 | 2.49 | 1.79 | 0.055 | 406.4 | 217.0 | 44.0 | 1.54 |
| 1987.5 | 449.3 | 239.7 | 58.0 | 2.55 | 1.87 | 0.058 | 416.3 | 222.4 | 47.0 | 1.62 |
| 1988.0 | 459.5 | 247.3 | 61.5 | 2.62 | 1.96 | 0.060 | 426.1 | 227.9 | 50.2 | 1.70 |
| 1988.5 | 469.1 | 252.6 | 65.1 | 2.68 | 2.05 | 0.063 | 435.8 | 233.4 | 53.3 | 1.79 |
| 1989.0 | 476.7 | 256.0 | 68.8 | 2.75 | 2.15 | 0.066 | 445.1 | 237.9 | 56.5 | 1.87 |
| 1989.5 | 484.0 | 260.5 | 71.8 | 2.82 | 2.24 | 0.069 | 454.4 | 242.3 | 59.7 | 1.96 |
| 1990.0 | 493.5 | 264.3 | 74.8 | 2.88 | 2.34 | 0.071 | 463.6 | 246.8 | 62.9 | 2.05 |
| 1990.5 | 497.1 | 265.4 | 77.0 | 2.95 | 2.44 | 0.074 | 472.7 | 251.2 | 66.1 | 2.15 |
| 1991.0 | 503.4 | 267.7 | 79.1 | 3.01 | 2.54 | 0.077 | 480.1 | 254.0 | 68.7 | 2.24 |
| 1991.5 | 508.8 | 268.6 | 80.6 | 3.08 | 2.65 | 0.080 | 487.4 | 256.8 | 71.2 | 2.34 |
| 1992.0 | 517.7 | 270.0 | 81.9 | 3.14 | 2.77 | 0.083 | 492.9 | 258.9 | 73.8 | 2.44 |
| 1992.5 | 520.5 | 270.7 | 82.7 | 3.21 | 2.88 | 0.086 | 498.4 | 260.9 | 76.4 | 2.54 |
| 1993.0 | 523.0 | 270.8 | 83.3 | 3.27 | 2.99 | 0.089 | 502.7 | 261.8 | 78.1 | 2.65 |
| 1993.5 | 526.0 | 270.9 | 84.1 | 3.34 | 3.10 | 0.092 | 507.0 | 262.6 | 79.8 | 2.75 |
| 1994.0 | 528.2 | 271.3 | 84.5 | 3.40 | 3.22 | 0.095 | 510.9 | 263.2 | 80.7 | 2.86 |
| 1994.5 | 533.3 | 270.7 | 84.8 | 3.47 | 3.33 | 0.098 | 514.7 | 263.8 | 81.6 | 2.97 |
| 1995.0 | 534.7 | 269.6 | 85.1 | 3.54 | 3.44 | 0.102 | 517.8 | 263.5 | 82.0 | 3.09 |
| 1995.5 | 534.8 | 269.0 | 85.3 | 3.60 | 3.55 | 0.105 | 520.9 | 263.2 | 82.3 | 3.20 |
| 1996.0 | 535.7 | 268.4 | 85.4 | 3.67 | 3.67 | 0.108 | 523.6 | 263.2 | 82.5 | 3.32 |
| 1996.5 | 537.4 | 267.7 | 85.3 | 3.73 | 3.78 | 0.111 | 526.2 | 263.1 | 82.6 | 3.44 |
| 1997.0 | 539.3 | 267.0 | 85.2 | 3.80 | 3.89 | 0.114 | 528.4 | 262.6 | 82.7 | 3.57 |
| 1997.5 | 540.9 | 266.3 | 85.0 | 3.86 | 4.00 | 0.117 | 530.6 | 262.1 | 82.8 | 3.69 |
| 1998.0 | 542.1 | 265.5 | 84.7 | 3.93 | 4.12 | 0.119 | 532.2 | 261.6 | 82.8 | 3.82 |
| 1998.5 | 543.0 | 264.7 | 84.4 | 3.99 | 4.23 | 0.122 | 533.8 | 261.1 | 82.7 | 3.95 |
| 1999.0 | 544.0 | 263.9 | 84.1 | 4.06 | 4.34 | 0.125 | 535.3 | 260.5 | 82.5 | 4.08 |
| 1999.5 | 544.6 | 263.0 | 83.7 | 4.13 | 4.45 | 0.128 | 536.7 | 259.9 | 82.2 | 4.22 |
| 2000.0 | 545.1 | 262.1 | 83.3 | 4.19 | 4.57 | 0.131 | 538.0 | 257.9 | 82.0 | 4.32 |
| 2000.5 | 545.5 | 261.1 | 83.0 | 4.26 | 4.68 | 0.133 | 538.7 | 257.0 | 81.7 | 4.43 |
| 2001.0 | 546.0 | 260.2 | 82.7 | 4.32 | 4.79 | 0.136 | 539.7 | 256.5 | 81.5 | 4.54 |
| 2001.5 | 546.2 | 259.1 | 82.4 | 4.39 | 4.91 | 0.138 | 540.3 | 255.6 | 81.2 | 4.65 |
| 2002.0 | 546.3 | 258.1 | 82.0 | 4.45 | 5.02 | 0.141 | 541.4 | 255.2 | 81.0 | 4.77 |
| 2002.5 | 546.3 | 257.0 | 81.7 | 4.52 | 5.13 | 0.143 | 541.3 | 254.0 | 80.4 | 4.89 |
| 2003.0 | 546.0 | 255.8 | 81.3 | 4.58 | 5.24 | 0.145 | 541.7 | 252.6 | 80.1 | 5.01 |
| 2003.5 | 545.7 | 254.7 | 80.9 | 4.65 | 5.36 | 0.147 | 541.8 | 251.9 | 79.7 | 5.14 |
| 2004.0 | 545.3 | 253.5 | 80.6 | 4.71 | 5.47 | 0.149 | 542.0 | 251.8 | 79.6 | 5.27 |
| 2004.5 | 544.8 | 252.2 | 80.2 | 4.78 | 5.58 | 0.151 | 541.5 | 250.5 | 79.1 | 5.40 |
| 2005.0 | 544.2 | 250.9 | 79.7 | 4.85 | 5.69 | 0.152 | 541.6 | 249.4 | 78.8 | 5.53 |
| 2005.5 | 543.3 | 249.6 | 79.3 | 4.91 | 5.81 | 0.154 | 540.6 | 247.9 | 78.4 | 5.67 |
| 2006.0 | 542.4 | 248.3 | 78.9 | 4.98 | 5.92 | 0.155 | 540.5 | 247.1 | 78.2 | 5.78 |
| 2006.5 | 541.3 | 246.9 | 78.4 | 5.04 | 6.03 | 0.156 | 539.8 | 245.7 | 77.8 | 5.89 |
| 2007.0 | 540.1 | 245.4 | 78.0 | 5.11 | 6.14 | 0.157 | 539.2 | 245.1 | 77.6 | 6.00 |
| 2007.5 | 538.7 | 244.0 | 77.5 | 5.17 | 6.26 | 0.157 | 537.8 | 243.7 | 77.0 | 6.11 |
| 2008.0 | 537.1 | 242.5 | 77.0 | 5.24 | 6.37 | 0.158 | 537.5 | 243.3 | 76.7 | 6.22 |
| 2008.5 | 535.5 | 240.9 | 76.5 | 6.48 | 537.1 | 242.9 | 76.4 | 6.33 | ||
| 2009.0 | 533.7 | 239.4 | 76.0 | 6.59 | 536.7 | 242.4 | 76.1 | 6.44 | ||
| 2009.5 | 531.7 | 237.7 | 75.5 | 6.71 | 536.4 | 242.0 | 75.8 | 6.55 | ||
| 2010.0 | 529.6 | 236.1 | 74.9 | 6.82 | 536.0 | 241.5 | 75.5 | 6.66 |
References
AFEAS (Alternative Fluorocarbon Environmental Acceptability Study), 2003, Production, sales and atmospheric release of fluorocarbons through 2001, AFEAS, Washington, D.C., URL http://www.afeas.org/
Busenberg, E., and Plummer, L.N., 1993, Use of trichlorofluoprocarbon-113 (CFC-113) as a hydrologic tracer and age-dating tool for young ground water, (abs.) Geological Society of America, 1993 Annual Meeting, Abstracts with Programs, 1993, p. A-365.
Cunnold, D., R. Weiss, R. Prinn, D. Hartley, P. Simmonds, P. Fraser, B. Miller, F. Alyea, and L. Porter, 1997, GAGE/AGAGE measurements indicating reductions in global emissions of CCl3F and CCl2F2 in 1992-1994. J. Geophys. Res., 102, 1259-1269.
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Prinn, R.G., R.F. Weiss, P.J. Fraser, P.G. Simmonds, D.M. Cunnold, F.N. Alyea, S. O'Doherty, P. Salameh, B.R. Miller, J. Huang, R.H.J. Wang, D.E. Hartley, C. Harth, L.P. Steele, G. Sturrock, P.M. Midgely, and A. McCulloch, 2000, A history of chemically and radiatively important gases in air deducedfrom ALE/GAGE/AGAGE, J. Geophys. Res., 115, 17751-17792.
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Walker, S.J., Weiss, R.F. and Salameh, P. K., 2000, Reconstructed histories of the annual mean atmospheric fractions for halocarbons CFC-11, CFC-12, and CFC-113, and carbon tetrachloride. Jour. Geophys. Res., v. 105, C6, 14285-14296.
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