Title: FLUXNET-CH4 Synthesis Activity: Objectives, Observations, and Future Directions
Authors: KNOX SARA H.JACKSON ROBERT B.POULTER BENJAMINMCNICOL GAVINFLUET-CHOUINARD ETIENNEZHANG ZHENHUGELIUS GUSTAVBOUSQUET PHILIPPECANADELL JOSEP G.SAUNOIS MARIELLEPAPALE DARIOCHU HOUSENKEENAN TREVORBALDOCCHI DENNISTORN MARGARETMAMMARELLA IVANTROTTA CARLOAURELA MIKABOHER GILCAMPBELL DAVIDCESCATTI ALESSANDROCHAMBERLAIN SAMUELCHEN JIQUANCHEN WEINANDENGEL SIGRIDDESAI ANKUR R.EUSKIRCHEN EUGENIEFRIBORG THOMASGASBARRA DANIELEGODED BALLARIN IGNACIOGOECKEDE MATHIASHEIMANN MARTINHELBIG MANUELHIRANO TAKASHIHOLLINGER DAVIDIWATA HIROKIKANG MINSEOKKLATT JANINAKRAUSS KEN W.KUTZBACH LARSLOHILA ANNALEAMITRA BHASKARMORIN TIMOTHY H.NILSSON MATS B.NIU SHULINOORMETS ASKOOECHEL WALTERPEICHL M.PELTOLA OLLIREBA MICHELE L.RICHARDSON ANDREW D.RUNKLE BENJAMIN R.K.RYU YOUNGRYELSACHS T.SCHÄFER KARINA V.R.SCHMID HANS PETERSHURPALI N.SONNENTAG OLIVERTANG ANGELA C.I.UEYAMA MASAHITOVARGAS RODRIGOVESALA TWARD ERIC J.WINDHAM-MYERS LISAMARIEWOHLFAHRT G.ZONA DONATELLA
Citation: BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY vol. 100 no. 12 p. 2607-2632
Publisher: AMER METEOROLOGICAL SOC
Publication Year: 2019
JRC N°: JRC116217
ISSN: 0003-0007 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC116217
DOI: 10.1175/BAMS-D-18-0268.1
Type: Articles in periodicals and books
Abstract: 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 yr–1 for an upland forest site to 114.9 ± 13.4 g C m–2 yr–1 for an estuarine freshwater marsh, with fluxes exceeding 40 g C m–2 yr–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 yr–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.
JRC Directorate:Energy, Transport and Climate

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