Table 3.
Same as Table 2, but for CH4 observations.
| CH4 (ppb) | VIC | GRA | ONT* | USC | FUL | COM | IRV | SCI | LJO | |
|---|---|---|---|---|---|---|---|---|---|---|
| All hours | mean | 1901.7 | 2103.9 | 2126.1 | 2126.5 | 2079.3 | 2090.7 | 2045.7 | 1901.4 | 2009.5 |
| 1σ SD | 34.2 | 331.3 | 231.5 | 227.9 | 218.0 | 240.8 | 246.7 | 39.9 | 247.0 | |
| min | 1824.9 | 1828.8 | 1860.3 | 1864.9 | 1849.9 | 1848.6 | 1845.6 | 1823.3 | 1838.2 | |
| 16th | 1869.4 | 1927.3 | 1956.6 | 1946.2 | 1923.7 | 1914.9 | 1902.5 | 1866.4 | 1883.7 | |
| median | 1898.5 | 2003.6 | 2073.6 | 2047.2 | 1998.1 | 1998.4 | 1966.7 | 1897.6 | 1925.2 | |
| 84th | 1933.4 | 2228.1 | 2287.1 | 2321.3 | 2245.8 | 2296.3 | 2183.5 | 1928.9 | 2108.6 | |
| max | 2383.1 | 6946.1 | 8675.7 | 4511.1 | 4474.8 | 3788.6 | 8432.4 | 2348.3 | 5439.1 | |
| RMS | 7.2 | 76.0 | 31.4 | 51.1 | 47.5 | 55.1 | 53.5 | 8.9 | 55.7 | |
| Mid-afternoon | mean | 1898.6 | 1985.6 | 1990.7 | 2009.9 | 1978.2 | 1977.2 | 1962.6 | 1900.9 | 1935.3 |
| 1σ SD | 32.9 | 130.5 | 93.3 | 116.4 | 100.2 | 109.8 | 101.5 | 37.9 | 77.5 | |
| min | 1832.7 | 1828.8 | 1862.5 | 1864.9 | 1849.7 | 1848.9 | 1845.6 | 1824.7 | 1838.3 | |
| 16th | 1866.5 | 1902.9 | 1924.7 | 1923.6 | 1907.5 | 1901.6 | 1889.7 | 1866.4 | 1877.3 | |
| median | 1896.7 | 1949.8 | 1969.3 | 1973.0 | 1947.6 | 1943.7 | 1929.2 | 1897.3 | 1911.3 | |
| 84th | 1928.6 | 2056.3 | 2042.2 | 2095.7 | 2041.2 | 2050.3 | 2036.4 | 1927.9 | 1997.6 | |
| max | 2105.3 | 3567.8 | 2634.0 | 2677.9 | 2710.1 | 3109.6 | 2960.0 | 2231.4 | 2758.3 | |
| RMS | 7.0 | 29.9 | 12.7 | 26.2 | 22.0 | 25.2 | 22.1 | 8.4 | 17.5 |
*
Statistics for the ONT site are based on measurements from September to December 2015 only.