Table 1.
The growing season CO2 and CH4 balances measured by EC tower compiled with major phenological and climatic parameters recorded at Stordalen in 2001–2008
| Year | Cumulative carbon balance (g C m−2 y−1) | Air temp. (°C) | Snow melt (DOY) | Growing season (DOY) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CO2 | CH4 | C | Min. | Avg. | Max. | Start | Stop | Duration | ||
| 2001 | −87 (−20)a | −74 (0) | −33.3 | −1.17 | 23.6 | 121 | 144 | 243 | 99 | |
| 2002 | −107 (−40)a | −94 (−20) | −33.0 | −0.68 | 24.3 | 116 | 138 | 243 | 105 | |
| 2003 | −109 (−42)a | −96 (−22) | −39.1 | −0.52 | 24.8 | 110 | 125 | 234 | 109 | |
| 2004 | −160 (−93)a | −147 (−73) | −34.1 | −0.33 | 24.6 | 111 | 117 | 231 | 114 | |
| 2005 | −127 (−60)a | −114 (−40) | −34.6 | −0.16 | 25.4 | 120 | 147 | 258 | 111 | |
| 2006 | −147 (−84) | 11 (18) | −136 (−66) | −38.8 | −0.22 | 23.2 | 121 | 113 | 239 | 126 |
| 2007 | −166 (−95) | 15 (22) | −151 (−73) | −34.1 | −0.19 | 27.5 | 119 | 142 | 252 | 110 |
| 2008 | −159 (−91) | −146 (−71) | −30.5 | −0.67 | 22.5 | 124 | 144 | 260 | 116 | |
| Average | −133 (−66) | 13 (20) | −120 (−46) | −34.7 | −0.49 | 24.5 | 118 | 134 | 245 | 111 |
The admittedly rough estimates of the full annual C balance in brackets are also presented based on an average of the measured winters. Methane flux numbers are from Jackowicz-Korczyński et al. (2010). The total C numbers are estimated on the average of 2 years (2006–2007) of available CH4 EC flux data
aValue represented by average winter flux calculated from 2006 to 2008 for CO2 and 2006 to 2007 for CH4