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    • Global Wetland Methane Emissions derived from FLUXNET and the UpCH4 Model, 2001-2018

    Metadata Updated: January 31, 2024

    This dataset provides monthly globally gridded freshwater wetland methane emissions from 2001-2018 in nmol CH4 m-2 s-1, g C-CH4 m-2 d-1, and TgCH4 grid cell-1 month-1. The data were derived from a six-predictor random forest upscaling model (UpCH4) trained on 119 site-years of eddy covariance CH4 flux data from 43 freshwater wetland sites covering bog (8), fen (8), marsh (10), swamp (6), and wet tundra (11) wetland classes and distributed across Arctic-boreal (20), temperate (16), and (sub)tropical (7) climate zones. Weekly mean CH4 fluxes were computed from half-hourly FLUXNET-CH4 Version 1.0 fluxes. Each grid cell CH4 flux prediction was weighted by fractional grid cell wetland extent to estimate CH4 emissions using the primary global dataset of Wetland Area and Dynamics for Methane Modeling (WAD2M) product and an alternate Global Inundation Estimate from Multiple Satellites GIEMS version 2 global wetland map. Both WAD2M and GIEMS-2 maps were modified with several correction data layers to represent the monthly area covered by vegetated wetlands, excluding open water and coastal wetlands. The data products are: mean daily fluxes with no adjustment for wetland area (i.e., flux densities assuming hypothetical 100% wetland cover); mean daily fluxes adjusting for WAD2M or GIEMS-2 wetland area; and by-pixel monthly sum of freshwater wetland methane emissions adjusting for WAD2M or GIEMS-2 wetland area. The data are provided in NetCDF4 format.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date January 22, 2024
    Metadata Updated Date January 31, 2024

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Location, class, and size of 26 globally distributed freshwater wetland clusters. Symbol sizes reflect the number of weekly CH4 fluxes in each cluster expressed as a percent of the total dataset considered in this study. Clusters combine data from sites that occur within 300 km of each other. At least one site was available from each major climate zone (Arctic-boreal, temperate, and tropical) and all major wetland classes were represented. Mean annual maximum wetland area fraction over 2000-2017 is shown from the Wetland Area Dynamics for Methane Modeling (WAD2M) product (Zhang et al., 2021).

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date January 22, 2024
    Metadata Updated Date January 31, 2024
    Publisher ORNL_DAAC
    Maintainer
    Identifier C2840821292-ORNL_CLOUD
    Data First Published 2024-01-18
    Language en-US
    Data Last Modified 2024-01-22
    Category CMS, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation McNicol, G., E. Fluet-Chouinard, Z. Ouyang, S.H. Knox, Z. Zhang, T. Aalto, S. Bansal, K.-Y. Chang, M. Chen, K. Delwiche, S.C. Feron, M. Goeckede, J. Liu, A. Malhotra, J.R. Melton, W. Riley, R. Vargas, K. Yuan, Q. Ying, Q. Zhu, P. Alekseychik, M. Aurela, D.P. Billesbach, D.I. Campbell, J. Chen, H. Chu, A.R. Desai, S.E. Euskirchen, J. Goodrich, T. Griffis, M. Helbig, T. Hirano, H. Iwata, G. Jurasinski, J. King, F. Koebsch, R. Kolka, K.W. Krauss, A. Lohila, I. Mammarella, M.B. Nilsson, A. Noormets, W. Oechel, M. Peichl, T. Sachs, A. Sakabe, C. Schulze, O. Sonnentag, R.C. Sullivan, E.S. Tuittila, M. Ueyama, T. Vesala, E.J. Ward, C. Wille, G.X. Wong, D. Zona, L. Windham-Myers, B. Poulter, and R.B. Jackson. 2023. Global Wetland Methane Emissions derived from FLUXNET and the UpCH4 Model, 2001-2018. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2253
    Graphic Preview Description Location, class, and size of 26 globally distributed freshwater wetland clusters. Symbol sizes reflect the number of weekly CH4 fluxes in each cluster expressed as a percent of the total dataset considered in this study. Clusters combine data from sites that occur within 300 km of each other. At least one site was available from each major climate zone (Arctic-boreal, temperate, and tropical) and all major wetland classes were represented. Mean annual maximum wetland area fraction over 2000-2017 is shown from the Wetland Area Dynamics for Methane Modeling (WAD2M) product (Zhang et al., 2021).
    Graphic Preview File https://daac.ornl.gov/CMS/guides/Global_Freshwater_CH4Emissions_Fig1.png
    Harvest Object Id 49d3d72c-2c74-4072-b025-e3a0bfd29e8b
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.3334/ORNLDAAC/2253
    Metadata Type geospatial
    Old Spatial -180.0 -56.0 180.0 85.0
    Program Code 026:001
    Source Datajson Identifier True
    Source Hash 471366fbe60ee488de273b90542258abec2d324924f2a303c3f3319228fca4ae
    Source Schema Version 1.1
    Spatial
    Temporal 2001-01-01T00:00:00Z/2018-12-31T23:59:59Z

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