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    • ABoVE: SAR-based Methane Ebullition Flux from Lakes, Five Regions, Alaska, 2007-2010

    Metadata Updated: December 6, 2023

    This dataset provides Synthetic Aperture Radar (SAR) estimates of lake-source methane ebullition flux in mg CH4/m2/d for thousands of lakes in five regions across Alaska. The study regions include the Atqasuk, Barrow Peninsula, Fairbanks, northern Seward Peninsula, and Toolik. L-band SAR backscatter values for early winter lake ice scenes were collected from 2007 to 2010 over 5,143 lakes using the Phased Array type L-band Synthetic Aperture Radar (PALSAR) instrument on the Advanced Land Observing Satellite (ALOS-1) satellite. The backscatter data were combined with field measurements of methane ebullition from 48 study lakes across the five regions to obtain a volumetric flux estimate for each lake. Mean methane gas-fractions from each region were applied to the SAR-based volumetric fluxes to obtain an estimate of methane ebullition mass flux per lake. The data files contain lake perimeters and the lake-specific attributes of lake area, SAR backscatter values and standard errors, volumetric flux with standard errors, mean percent of methane from gas samples, and methane ebullition mass flux.

    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 December 1, 2022
    Metadata Updated Date December 6, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    SAR-based lake ebullition maps. Panel A shows Alaska study regions with SAR footprints outlined in yellow. Subsequent panels show SAR-based CH4 ebullition maps for B) Barrow Peninsula, C) Atqasuk, D) Toolik, E) northern Seward Peninsula, and F) Fairbanks. Study lakes with field-based measurements are outlined (B,C) or boxed (D,E,F) in white. Orange boxes in panel F indicate anthropogenic study lakes. Source: Engram et al. (2020).

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date December 1, 2022
    Metadata Updated Date December 6, 2023
    Publisher ORNL_DAAC
    Maintainer
    Identifier C2143401901-ORNL_CLOUD
    Data First Published 2020-07-15
    Language en-US
    Data Last Modified 2023-06-12
    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 Engram, M.J., K.W. Anthony, and F.J. Meyer. 2020. ABoVE: SAR-based Methane Ebullition Flux from Lakes, Five Regions, Alaska, 2007-2010. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1790
    Graphic Preview Description SAR-based lake ebullition maps. Panel A shows Alaska study regions with SAR footprints outlined in yellow. Subsequent panels show SAR-based CH4 ebullition maps for B) Barrow Peninsula, C) Atqasuk, D) Toolik, E) northern Seward Peninsula, and F) Fairbanks. Study lakes with field-based measurements are outlined (B,C) or boxed (D,E,F) in white. Orange boxes in panel F indicate anthropogenic study lakes. Source: Engram et al. (2020).
    Graphic Preview File https://daac.ornl.gov/ABOVE/guides/SAR_Methane_Ebullition_AK_Fig1.png
    Harvest Object Id 492cd6a9-4208-4f00-b66b-157c75f7bd75
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.3334/ORNLDAAC/1790
    Metadata Type geospatial
    Old Spatial -165.17 64.44 -147.37 71.35
    Program Code 026:001
    Source Datajson Identifier True
    Source Hash fa48908359ff9f8e3dfb2c8bd8d9227d885820d66bafe9a9de3ba0295b863dc0
    Source Schema Version 1.1
    Spatial
    Temporal 2007-11-13T00:00:00Z/2010-11-11T23:59:59Z

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