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Radar remote sensing is a well-established method to discriminate lakesretaining liquid-phase water beneath winter ice cover from those that donot. L-band (23.6 cm wavelength) airborne radar showed great promise in the1970s, but spaceborne synthetic aperture radar (SAR) studies have focusedon C-band (5.6 cm) SAR to classify lake ice with no further attention toL-band SAR for this purpose. Here, we examined calibrated L-band single- andquadrature-polarized SAR returns from floating and grounded lake ice in tworegions of Alaska: the northern Seward Peninsula (NSP) where methane ebullitionis common in lakes and the Arctic Coastal Plain (ACP) where ebullition isrelatively rare. We found average backscatter intensities of −13 dB and−16 dB for late winter floating ice on the NSP and ACP, respectively, and −19 dBfor grounded ice in both regions. Polarimetric analysis revealed that themechanism of L-band SAR backscatter from floating ice is primarily roughnessat the ice–water interface. L-band SAR showed less contrast between floatingand grounded lake ice than C-band; however, since L-band is sensitive toebullition bubbles trapped by lake ice (bubbles increase backscatter), thisstudy helps elucidate potential confounding factors of grounded ice inmethane studies using SAR

Characterization of L-band synthetic aperture radar (SAR) backscatter from floating and grounded thermokarst lake ice in Arctic Alaska