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• W1983363555 abstract "We present nearly coincident observations of backscattering from the ERS 1 synthetic aperture radar (SAR) and of near‐surface temperature from six drifting buoys in the Beaufort Sea, showing that the onset of melting in snow on multiyear sea ice is clearly detectable in the SAR data. Melt onset is marked by a clean, steep decrease in the backscattering cross section of multiyear ice at 5.3 GHz and VV polarization. We investigate the scattering physics responsible for the signature change and find that the cross section decrease is due solely to the appearance of liquid water in the snow cover overlying the ice. A thin layer of moist snow is sufficient to cause the observed decrease. We present a prototype algorithm to estimate the date of melt onset using the ERS 1 SAR and apply the algorithm first to the SAR data for which we have corresponding buoy temperatures. The melt onset dates estimated by the SAR algorithm agree with those obtained independently from the temperature data to within 4 days or less, with the exception of one case in which temperatures oscillated about 0°C for several weeks. Lastly, we apply the algorithm to the entire ERS 1 SAR data record acquired by the Alaska SAR Facility for the Beaufort Sea north of 73°N during the spring of 1992, to produce a map of the dates of melt onset over an area roughly 1000 km on a side. The progression of melt onset is primarily poleward but shows a weak meridional dependence at latitudes of approximately 76°–77°N. Melting begins in the southern part of the study region on June 13 and by June 20 has progressed to the northernmost part of the region." @default.
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• W1983363555 date "1994-11-15" @default.
• W1983363555 modified "2023-10-14" @default.
• W1983363555 title "Observation of melt onset on multiyear Arctic sea ice using the ERS 1 synthetic aperture radar" @default.
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• W1983363555 doi "https://doi.org/10.1029/94jc01268" @default.
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