ABoVE: SAR-based Methane Ebullition Flux from Lakes, Five Regions, Alaska, 2007-2010 : Arctic-Boreal Vulnerability Experiment (ABoVE)

• Main Authors: Engram, M.J., Anthony, K.W., Meyer, F.J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: ORNL Distributed Active Archive Center 2020
• Subjects: TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS; TERRESTRIAL HYDROSPHERE > SNOW/ICE > LAKE ICE; ATMOSPHERE > ATMOSPHERIC CHEMISTRY > CARBON AND HYDROCARBON COMPOUNDS > METHANE; ALOS > PALSAR; methane ebullition; Synthetic aperture radar; lake-source methane; thermokarst lakes; greenhouse gas; lake ice; methane; SAR; Arctic; Fairbanks; Barrow Peninsula; Winter Lake; Barrow; Seward Peninsula; Thermokarst; Alaska
• Online Access: https://dx.doi.org/10.3334/ornldaac/1790; https://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=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. 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 2011 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.