Assessing the uncertainty of estimated annual totals of net ecosystem productivity: A practical approach applied to a mid latitude temperate pine forest |
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Authors: | Jan A Elbers Cor MJ JacobsBart Kruijt Wilma WP JansEddy J Moors |
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Institution: | Alterra, Wageningen UR, Earth System Science and Climate Change Group, PO Box 47, 6700 AA, Wageningen, The Netherlands |
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Abstract: | Values for annual NEP of micrometeorological tower sites are usually published without an estimate of associated uncertainties. Few authors quantify total uncertainty of annual NEP. Moreover, different methods to assess total uncertainty are applied, usually addressing only one aspect of the uncertainty. This paper presents a robust and easy to apply method to quantify uncertainty of annual totals of Net Ecosystem Productivity (NEP), related to multiple factors involved therein. The method was applied to NEP observations for a Scots pine forest (Loobos) in the Netherlands. Total uncertainty of annual NEP for the Loobos site was on average ±32 g C m−2 a−1 (±8% of NEP), which is a quarter of the standard deviation of annual NEP (127 g C m−2 a−1). |
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Keywords: | NEP annual net ecosystem productivity (g C m&minus 2 a&minus 1 positive values represent accumulation of carbon by the ecosystem) Fec eddy-covariance flux (μmol m&minus 2 s&minus 1 positive values represent carbon released to the atmosphere) Fs storage flux (μmol m&minus 2 s&minus 1 positive values represent carbon released to the atmosphere) NEE net ecosystem exchange (μmol m&minus 2 s&minus 1 positive values represent carbon released to the atmosphere) |
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