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    Author(s): Sara H. Knox; Robert B. Jackson; Benjamin Poulter; Gavin McNicol; Etienne Fluet-Chouinard; Zhen Zhang; Gustaf Hugelius; Philippe Bousquet; Josep G. Canadell; Marielle Saunois; Dario Papale; Housen Chu; Trevor F. Keenan; Dennis Baldocchi; Margaret S. Torn; Ivan Mammarella; Carlo Trotta; Mika Aurela; Gil Bohrer; David I Campbell; Alessandro Cescatti; Samuel Chamberlain; Jiquan Chen; Weinan Chen; Sigrid Dengel; Ankur R. Desai; Eugenie Euskirchen; Thomas Friborg; Daniele Gasbarra; Ignacio Goded; Mathias Goeckede; Martin Heimann; Manuel Helbig; Takashi Hirano; David Y. Hollinger; Hiroki Iwata; Minseok Kang; Janina Klatt; Ken W. Krauss; Lars Kutzbach; Annalea Lohila; Bhaskar Mitra; Timothy H. Morin; Mats B. Nilsson; Shuli Niu; Asko Noormets; Walter C. Oechel; Matthias Peichl; Olli Peltola; Michele L. Reba; Andrew D. Richardson; Benjamin R. K. Runkle; Youngryel Ryu; Torsten Sachs; Karina V R. Schäfer; Hans Peter Schmid; Narasinha Shurpali; Oliver Sonnentag; Angela C. I Tang; Masahito Ueyama; Rodrigo Vargas; Timo Vesala; Eric J. Ward; Lisamarie Windham-Myers; Georg Wohlfahrt; Donatella Zona
    Date: 2019
    Source: Bulletin of the American Meteorological Society
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: Download Publication  (2.0 MB)


    This paper describes the formation of, and initial results for, a new FLUXNET coordination network for ecosystem-scale methane (CH4) measurements at 60 sites globally, organized by the Global Carbon Project in partnership with other initiatives and regional flux tower networks. The objectives of the effort are presented along with an overview of the coverage of eddy covariance (EC) CH4 flux measurements globally, initial results comparing CH4 fluxes across the sites, and future research directions and needs. Annual estimates of net CH4 fluxes across sites ranged from -0.2 ± 0.02 g C m-2 y-1 for an upland forest site to 114.9 ± 13.4 g C m-2 y-1 for an estuarine freshwater marsh, with fluxes exceeding 40 g C m-2 y-1 at multiple sites. Average annual soil and air temperatures were found to be the strongest predictor of annual CH4 flux across wetland sites globally. Water table position was positively correlated with annual CH4 emissions, although only for wetland sites that were not consistently inundated throughout the year. The ratio of annual CH4 fluxes to ecosystem respiration increased significantly with mean site temperature. Uncertainties in annual CH4 estimates due to gap filling and random errors were on average ± 1.6 g C m-2 y-1 at 95% confidence, with the relative error decreasing exponentially with increasing flux magnitude across sites. Through the analysis and synthesis of a growing EC CH4 flux database, the controls on ecosystem CH4 fluxes can be better understood, used to inform and validate Earth system models, and reconcile differences between land-surface model- and atmospheric-based estimates of CH4 emissions.

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    Knox, Sara H.; Jackson, Robert B.; Poulter, Benjamin; McNicol, Gavin; Fluet-Chouinard, Etienne; Zhang, Zhen; Hugelius, Gustaf; Bousquet, Philippe; Canadell, Josep G.; Saunois, Marielle; Papale, Dario; Chu, Housen; Keenan, Trevor F.; Baldocchi, Dennis; Torn, Margaret S.; Mammarella, Ivan; Trotta, Carlo; Aurela, Mika; Bohrer, Gil; Campbell, David I.; Cescatti, Alessandro; Chamberlain, Samuel; Chen, Jiquan; Chen, Weinan; Dengel, Sigrid; Desai, Ankur R.; Euskirchen, Eugenie; Friborg, Thomas; Gasbarra, Daniele; Goded, Ignacio; Goeckede, Mathias; Heimann, Martin; Helbig, Manuel; Hirano, Takashi; Hollinger, David Y.; Iwata, Hiroki; Kang, Minseok; Klatt, Janina; Krauss, Ken W.; Kutzbach, Lars; Lohila, Annalea; Mitra, Bhaskar; Morin, Timothy H.; Nilsson, Mats B.; Niu, Shuli; Noormets, Asko; Oechel, Walter C.; Peichl, Matthias; Peltola, Olli; Reba, Michele L.; Richardson, Andrew D.; Runkle, Benjamin R. K.; Ryu, Youngryel; Sachs, Torsten; Schäfer, Karina V. R.; Schmid, Hans Peter; Shurpali, Narasinha; Sonnentag, Oliver; Tang, Angela C. I.; Ueyama, Masahito; Vargas, Rodrigo; Vesala, Timo; Ward, Eric J.; Windham-Myers, Lisamarie; Wohlfahrt, Georg; Zona, Donatella. 2019. FLUXNET-CH4 Synthesis Activity: Objectives, Observations, and Future Directions . Bulletin of the American Meteorological Society. 75 p.


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