Imaging · collection · 2020

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

Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.3334/ornldaac/1790

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.

Description

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.

Topics

Stated by source: Advanced Land Observing Satellite · Lake Ice · Lakes/Reservoirs · Methane · Phased Array type L-band Synthetic Aperture Radar
From keywords: Chemistry · Earth & Environmental Science · Ocean & Atmospheric Science
Inferred from text: Climate change science 70%

Provenance · 2 source records, 19 field assertions

Source	Key	Last seen	Raw
NASA Earthdata CMR	C2143401901-ORNL_CLOUD	7 d ago	JSON v1
NASA Data Portal	c9b652c9-6f06-4c95-9228-8b9adbea3b71	5 d ago	JSON v1

Field	Assertion	Extractor	Evidence
access_level	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[field].anzsrc:group:3702	enrichment · NASA CMR	taxonomy-embedding@1.1.0	title+keywords+description (70%)
concepts[field].local:field:chemistry	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:earth-environmental	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[field].local:field:ocean-atmospheric	mapping · data nasa gov	connector:data_nasa_gov@1.0.0
concepts[instrument].gcmd_instrument:palsar	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[measured_variable].gcmd:earth-science/atmosphere/atmospheric-chemistry/carbon-and-hydrocarbon-compounds/methane	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/snow-ice/lake-ice	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/surface-water/surface-water-features/lakes-reservoirs	source · NASA CMR	connector:nasa_cmr@1.0.0
concepts[platform].gcmd_platform:alos	source · NASA CMR	connector:nasa_cmr@1.0.0
created_date	source · NASA CMR	connector:nasa_cmr@1.0.0
description	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/Abstract
license_text	source · data nasa gov	connector:data_nasa_gov@1.0.0
publication_date	source · NASA CMR	connector:nasa_cmr@1.0.0
spatial	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/SpatialExtent
temporal	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/TemporalExtents
title	source · NASA CMR	connector:nasa_cmr@1.0.0	/umm/EntryTitle
updated_date	source · NASA CMR	connector:nasa_cmr@1.0.0
version_label	source · NASA CMR	connector:nasa_cmr@1.0.0

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

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