A simple calculation algorithm to separate high-resolution CH4 flux measurements into ebullition- and diffusion-derived components
Processes driving the production, transformation and transport of methane (CH4) in wetland ecosystems are highly complex. We present a simple calculation algorithm to separate open-water CH4 fluxes measured with automatic chambers into diffusion- and ebullition-derived components. This helps to reve...
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| Published in | Atmospheric measurement techniques Vol. 10; no. 1; pp. 109 - 118 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Katlenburg-Lindau
Copernicus GmbH
06.01.2017
Copernicus Publications |
| Online Access | Get full text |
| ISSN | 1867-1381 1867-8548 1867-8548 |
| DOI | 10.5194/amt-10-109-2017 |
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| Abstract | Processes driving the production, transformation and transport of methane (CH4) in wetland ecosystems are highly complex. We present a simple calculation algorithm to separate open-water CH4 fluxes measured with automatic chambers into diffusion- and ebullition-derived components. This helps to reveal underlying dynamics, to identify potential environmental drivers and, thus, to calculate reliable CH4 emission estimates. The flux separation is based on identification of ebullition-related sudden concentration changes during single measurements. Therefore, a variable ebullition filter is applied, using the lower and upper quartile and the interquartile range (IQR). Automation of data processing is achieved by using an established R script, adjusted for the purpose of CH4 flux calculation. The algorithm was validated by performing a laboratory experiment and tested using flux measurement data (July to September 2013) from a former fen grassland site, which converted into a shallow lake as a result of rewetting. Ebullition and diffusion contributed equally (46 and 55%) to total CH4 emissions, which is comparable to ratios given in the literature. Moreover, the separation algorithm revealed a concealed shift in the diurnal trend of diffusive fluxes throughout the measurement period. The water temperature gradient was identified as one of the major drivers of diffusive CH4 emissions, whereas no significant driver was found in the case of erratic CH4 ebullition events. |
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| AbstractList | Processes driving the production, transformation and transport of methane (CH4) in wetland ecosystems are highly complex. We present a simple calculation algorithm to separate open-water CH4 fluxes measured with automatic chambers into diffusion- and ebullition-derived components. This helps to reveal underlying dynamics, to identify potential environmental drivers and, thus, to calculate reliable CH4 emission estimates. The flux separation is based on identification of ebullition-related sudden concentration changes during single measurements. Therefore, a variable ebullition filter is applied, using the lower and upper quartile and the interquartile range (IQR). Automation of data processing is achieved by using an established R script, adjusted for the purpose of CH4 flux calculation. The algorithm was validated by performing a laboratory experiment and tested using flux measurement data (July to September 2013) from a former fen grassland site, which converted into a shallow lake as a result of rewetting. Ebullition and diffusion contributed equally (46 and 55%) to total CH4 emissions, which is comparable to ratios given in the literature. Moreover, the separation algorithm revealed a concealed shift in the diurnal trend of diffusive fluxes throughout the measurement period. The water temperature gradient was identified as one of the major drivers of diffusive CH4 emissions, whereas no significant driver was found in the case of erratic CH4 ebullition events. |
| Author | Hagemann, Ulrike Jurisch, Nicole Juana Garcia Alba Augustin, Jürgen Schulz-Hanke, Maximilian Sommer, Michael Hoffmann, Mathias Sachs, Torsten |
| Author_xml | – sequence: 1 givenname: Mathias surname: Hoffmann fullname: Hoffmann, Mathias – sequence: 2 givenname: Maximilian surname: Schulz-Hanke fullname: Schulz-Hanke, Maximilian – sequence: 3 fullname: Juana Garcia Alba – sequence: 4 givenname: Nicole surname: Jurisch fullname: Jurisch, Nicole – sequence: 5 givenname: Ulrike surname: Hagemann fullname: Hagemann, Ulrike – sequence: 6 givenname: Torsten surname: Sachs fullname: Sachs, Torsten – sequence: 7 givenname: Michael surname: Sommer fullname: Sommer, Michael – sequence: 8 givenname: Jürgen surname: Augustin fullname: Augustin, Jürgen |
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| Title | A simple calculation algorithm to separate high-resolution CH4 flux measurements into ebullition- and diffusion-derived components |
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