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

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.

Data and Resources

Field Value
accessLevel public
bureauCode {026:00}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.nasa.gov/data.json
catalog_conformsTo 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
identifier C1906827740-ORNL_DAAC
issued 2020-07-15
landingPage https://doi.org/10.3334/ORNLDAAC/1790
language {en-US}
metadata_type geospatial
modified 2020-07-20
programCode {026:001}
publisher ORNL_DAAC
resource-type Dataset
source_datajson_identifier true
source_hash 589f0e81f2b4b47a4444bcd26739f713207ef30f
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-165.17, 64.44], [-147.37, 64.44], [-147.37, 71.35], [-165.17, 71.35], [-165.17, 64.44]]]}
temporal 2007-11-13T00:00:00Z/2010-11-11T23:59:59Z
theme {ABoVE,geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • atmosphere
  • atmospheric-chemistry
  • ckan
  • earth-science
  • geo
  • geoss
  • national
  • north-america
  • snow-ice
  • surface-water
  • terrestrial-hydrosphere
  • united-states
isopen False
license_id notspecified
license_title License not specified
maintainer undefined
maintainer_email uso@daac.ornl.gov
metadata_created 2025-11-22T21:45:59.353827
metadata_modified 2025-11-22T21:45:59.353831
notes 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.
num_resources 12
num_tags 14
title ABoVE: SAR-based Methane Ebullition Flux from Lakes, Five Regions, Alaska, 2007-2010