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    • CO2 and CH4 Fluxes from Waterbodies, Yukon-Kuskokwim Delta, Alaska, 2016-2019

    Metadata Updated: May 22, 2024

    This dataset provides estimates of carbon dioxide (CO2) and methane (CH4) diffusive fluxes from waterbodies, and watershed landcover data for the central-interior of the Yukon-Kuskokwim Delta (YK delta), Alaska. Dissolved concentrations of methane and carbon dioxide were predicted using an integrated terrestrial-aquatic approach to scale observations based on landscape and waterbody remote sensing drivers. The observations include ~300 samples of surface water dissolved gases collected in July 2016-2019 from the central region of the YK Delta, Alaska. A machine learning model was used to generate estimated fluxes. Model inputs include Sentinel-2 MSI with derived normalized difference vegetation index (NDVI) and normalized difference water index (NDWI), an Arctic digital elevation model (DEM) with derived slope and flow accumulation, Sentinel-1 C-band July and December VV and VH composites, and a landcover map. Waterbody size, shape, and reflectance were determined using object-based image analysis in Google Earth Engine. Landscape-level input data were averaged in non-nested sub-basins calculated using the System for Automated Geoscientific Analyses (SAGA) "channel network" algorithm at three threshold sizes. Cross validation was used to tune and select variables for gradient boosting models. The trained gradient boosting models were then used to predict dissolved methane and carbon dioxide in all waterbodies (~17,000) in the region. These aquatic concentrations were converted to fluxes using an average gas transfer velocity from observations (0.33 m/d). The data are provided in GeoTIFF and shapefile formats.

    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 May 22, 2024
    Metadata Updated Date May 22, 2024

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Study area in the Yukon Kuskokwim Delta of Alaska (left) with regional context (right). Sentinel-2 10 m resolution RGB imagery of the study region (left). Surface water sample locations from 2016 to 2019 are depicted as yellow points. Source: Ludwig et al. (2022).

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date May 22, 2024
    Metadata Updated Date May 22, 2024
    Publisher ORNL_DAAC
    Maintainer
    Identifier C2992461082-ORNL_CLOUD
    Data First Published 2024-05-09
    Language en-US
    Data Last Modified 2024-05-10
    Category ABoVE, 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 Ludwig, S., S. Natali, J. Schade, M. Powell, G. Fiske, L.D. Schiferl, and R. Commane. 2023. CO2 and CH4 Fluxes from Waterbodies, Yukon-Kuskokwim Delta, Alaska, 2016-2019. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2178
    Graphic Preview Description Study area in the Yukon Kuskokwim Delta of Alaska (left) with regional context (right). Sentinel-2 10 m resolution RGB imagery of the study region (left). Surface water sample locations from 2016 to 2019 are depicted as yellow points. Source: Ludwig et al. (2022).
    Graphic Preview File https://daac.ornl.gov/ABOVE/guides/CH4_CO2_WaterBodies_YK_Delta_Fig1.jpg
    Harvest Object Id d47b92b3-2749-4770-a444-299892f147e8
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.3334/ORNLDAAC/2178
    Metadata Type geospatial
    Old Spatial -163.82 60.9 -162.07 61.68
    Program Code 026:001
    Source Datajson Identifier True
    Source Hash 9b615182567d4113d56a92080f8c16085b7fb7fadcac4f4ba986a580ebe4036c
    Source Schema Version 1.1
    Spatial
    Temporal 2016-07-07T00:00:00Z/2019-07-07T23:59:59Z

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