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

Description

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.

Resources

Name Format Description Link
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.3334%2FORNLDAAC%2F2253
21 This link allows direct data access via Earthdata login https://daac.ornl.gov/daacdata/cms/Global_Freshwater_CH4Emissions/
21 ORNL DAAC Data Set Documentation https://daac.ornl.gov/CMS/guides/Global_Freshwater_CH4Emissions.html
21 Data set Landing Page DOI URL https://doi.org/10.3334/ORNLDAAC/2253
21 USE SERVICE API https://opendap.earthdata.nasa.gov/
33 Global Wetland Methane Emissions derived from FLUXNET and the UpCH4 Model, 2001-2018: Global_Freshwater_CH4Emissions.pdf https://data.ornldaac.earthdata.nasa.gov/public/cms/Global_Freshwater_CH4Emissions/comp/Global_Freshwater_CH4Emissions.pdf
34 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). https://daac.ornl.gov/CMS/guides/Global_Freshwater_CH4Emissions_Fig1.png

Tags

  • surface-water
  • atmosphere
  • terrestrial-hydrosphere
  • atmospheric-chemistry
  • earth-science

Topics

Categories