Constraints of the enhanced snow melt in the northern Antarctic Peninsula during the 2021/22 melt season from Sentinel-1 data and in-situ observations
| Autoři | |
|---|---|
| Rok publikování | 2026 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Cold Regions Science and Technology |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | http://dx.doi.org/10.1016/j.coldregions.2025.104722 |
| Doi | https://doi.org/10.1016/j.coldregions.2025.104722 |
| Klíčová slova | Melt; Glacier; Sentinel-1; Air temperature; Antarctic Peninsula |
| Popis | A time series of 32 Sentinel-1 images were used to establish the constraints of the surface melt on the Trinity Peninsula and James Ross Island from October 2021 to April 2022. The consistency of the decrease in the backscatter coefficient (sigma 0) with the rise in air temperature above 0 degrees C was validated through in-situ measured meteorological data. The correlation coefficient between the air temperature characteristics and sigma 0 was highest in the accumulation area of the glaciers on James Ross Island. A decrease of sigma 0 by-4 dB, compared to the winter mean value, was chosen as the threshold for the melt constraint. The number of melt days, derived from the Sentinel-1 data, was in better agreement with the same characteristics retrieved from the six-day mean air temperature, than that from the sum of positive degree days. The method proved to be useful when applied to the percolation zone, but unsuitable for the termination zone of glaciers with bare ice and for the dry snow zone. The snow-melt indices were subject to detailed analysis along selected transects across the Trinity Peninsula and James Ross Island in terms of both elevation and local/regional differences. The maximum number of melt days ranged from 150 to 180 days on the west coast of the Trinity Peninsula to 90-120 days on the southeastern part of James Ross Island. The earliest occurrence and longest duration of snow melt was observed on the northwestern coast of the Trinity Peninsula. On the east coast of the Peninsula, in the area from 200 to 600 m a.s.l., the melt duration was approximately 100 days. During a significant temperature anomaly in early February 2022, the snow melt extended to the summit of Mt. Haddington. At the same time, surface snow melting advanced to an elevation of 1600 m a.s.l. on the Trinity Peninsula. Apart from this extreme event, melting at altitudes above 1000-1200 m a.s.l. was rarely observed. |
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