{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["026:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "Earthdata Forum", "hasEmail": "mailto:earthdata-support@nasa.gov"}, "description": "This dataset includes maps and locations of potential gas seepage in lakes within the immediate and surrounding area around Fairbanks, Alaska, a region underlain by discontinuous permafrost and characterized by thermokarst lake formation. Gas bubbling from lakes in the Fairbanks area is usually rich in methane, a potent greenhouse gas that is difficult to quantify. A new remote sensing method was used for detecting potential gas seepage, defined as areas of suspected perennial ebullition, by using a previously ground-truthed seep that appeared as a high-backscatter perennial feature in winter L-band Synthetic Aperture Radar (SAR) data from 2006-2011. Based on threshold values determined by the sigma-naught backscatter of this training seep, 1,690 areas of potential seepage were detected in 459 lakes out of 658 lakes analyzed. Results were validated through a different ground-truthed seep. The data are provided in shapefile format.", "distribution": [{"@type": "dcat:Distribution", "conformsTo": "http://www.isotc211.org/2005/gmi", "description": "The metadata's original source.", "downloadURL": "https://cmr.earthdata.nasa.gov/search/concepts/C3518594641-LARC_CLOUD.iso19115", "format": "ISO", "mediaType": "text/xml", "title": "Original Metadata"}, {"@type": "dcat:Distribution", "downloadURL": "https://asdc.larc.nasa.gov/citing-data", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://asdc.larc.nasa.gov/documents/prefire/ATBD/PREFIRE_2B-CLD_ATBD-20250430.pdf", "format": "PDF", "mediaType": "application/pdf"}, {"@type": "dcat:Distribution", "downloadURL": "https://asdc.larc.nasa.gov/documents/prefire/guide/PREFIRE_Data_User_Guide_2B-CLD_R01.pdf", "format": "PDF", "mediaType": "application/pdf"}, {"@type": "dcat:Distribution", "downloadURL": "https://asdc.larc.nasa.gov/project/PREFIRE", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://asdc.larc.nasa.gov/static/images/project_logos/prefire.png", "format": "PNG", "mediaType": "image/png"}, {"@type": "dcat:Distribution", "downloadURL": "https://doi.org/10.5067/PREFIRE-SAT1/PREFIRE/CLD_L2B.R01", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://git.earthdata.nasa.gov/projects/PREFIRE", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://prefire.ssec.wisc.edu/", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://prefire.ssec.wisc.edu/prefire-sat1-operations-log/", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://science.jpl.nasa.gov/projects/prefire/", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://science.nasa.gov/mission/prefire/", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://search.earthdata.nasa.gov/search/granules?p=C3518594641-LARC_CLOUD", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://zenodo.org/records/16638853", "format": "BIN", "mediaType": "application/octet-stream"}, {"@type": "dcat:Distribution", "downloadURL": "https://zenodo.org/records/16694725", "format": "BIN", "mediaType": "application/octet-stream"}], "identifier": "10.3334/ORNLDAAC/2394", "keyword": ["earth-science-climate-feedbacks-climate-indicators-cryospheric-feedbacks", "earth-science-ecosystems-biosphere-freshwater-ecosystems", "earth-science-frozen-ground-cryosphere-permafrost", "earth-science-paleoclimate-indicators-climate-indicators-permafrost-methane-release", "earth-science-snow-ice-cryosphere-lake-ice", "earth-science-water-quality-water-chemistry-terrestrial-hydrosphere-gases"], "license": "https://www.usa.gov/government-works", "modified": "2026-06-23", "programCode": ["026:000"], "publisher": {"@type": "org:Organization", "name": "ORNL_DAAC"}, "spatial": "[\"CARTESIAN\", [{\"WestBoundingCoordinate\": -148.287, \"NorthBoundingCoordinate\": 65.1787, \"EastBoundingCoordinate\": -146.87, \"SouthBoundingCoordinate\": 64.3313}]]", "temporal": "2006-12-04/2011-03-17", "theme": ["Earth Science"], "title": "Potential Areas of Gas Seepage Detected by SAR in Lakes near Fairbanks, Alaska"}