Cross-site comparison of ecosystem- and plot-scale methane fluxes from wetlands and uplands (Version 1)

This dataset contains the six temporal aggregations (separate datasets; half-hourly, hourly, daily, weekly, monthly and annual) used in the article "Määttä et al. A cross-site comparison of ecosystem- and plot-scale methane fluxes from wetlands and uplands" (manuscript submitted to Biogeosciences 2025-10-10). The datasets contain contemporaneous timestamp-aligned methane (CH4) flux data from eddy covariance (EC) and chamber measurements from 10 sites, as well as environmental data derived from FLUXNET-CH4 (Delwiche et al., 2020; Knox et al., 2019; https://fluxnet.org/data/fluxnet-ch4-community-product/) and chamber-associated measurements used as predictors of ecosystem and plot-scale CH4 flux differences. Please note that all (except for site US-StJ) EC data were obtained from the FLUXNET-CH4 database (Delwiche et al., 2020; Knox et al., 2019; CC-BY 4.0) and chamber CH4 flux and environmental data from site data providers (chamber data that has not been published elsewhere with CC-BY 4.0 has been included in these datasets with permission from data providers). EC data for US-StJ were obtained from the site data providers. For questions related to site-specific chamber and EC CH4 flux and environmental data, please contact the data providers or refer to site-specific literature (see README.txt).