Seasonal land-ice-flow variability in the Antarctic Peninsula
نویسندگان
چکیده
Abstract. Recent satellite-remote sensing studies have documented the multi-decadal acceleration of Antarctic Ice Sheet in response to rapid rates ice-sheet retreat and thinning. Unlike Greenland Sheet, where historical, high-temporal-resolution satellite situ observations revealed distinct changes land-ice flow within intra-annual timescales, similar seasonal signals are limited Antarctica. Here, we use high-spatial- Copernicus Sentinel-1A/B synthetic aperture radar acquired between 2014 2020 provide first evidence for variability land ice feeding George VI Shelf (GVIIS), Peninsula. Our reveal a austral summertime (December–February) speed-up ∼0.06±0.005 m d−1 (∼ 22±1.8 yr−1) at, immediately inland of, grounding line glaciers nourishing shelf, which constitutes mean ∼15 % relative baseline (time-series-averaged) flow. These findings corroborated by independent, optically derived velocity obtained from Landsat 8 imagery. Both surface oceanic forcing mechanisms outlined as potential controls on this seasonality. Ultimately, our imply that and/or ocean may be driving accelerations at lines other vulnerable outlet around Assessing degree ice-flow such locations is important quantifying accurately Antarctica's future contribution global sea-level rise.
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ژورنال
عنوان ژورنال: The Cryosphere
سال: 2022
ISSN: ['1994-0424', '1994-0416']
DOI: https://doi.org/10.5194/tc-16-3907-2022