Abstract
The article provides phenomenological and experimental arguments that ice sheet surface fluctuation in Antarctica is mediated by ice velocity and subglacial water flow. To understand this link we use temporal coherence to refer to the comparison between vertical profile and a shifted profile along the repeat ICESat track. A profile shift due to ice velocity is determined from cross-correlation between initial and shifted profiles. Ice velocity induced fluctuation in surface elevation and deformation of the vertical profile. The degree of coherence indicates a decrease in similarity of moving vertical profiles and their deformation. The water flow beneath the ice sheet and over the subglacial lakes generates irregular rise and fall of the surface. Observations in area of Dome A and its slope have revealed such behavior of surface, where the surface is placid and ice velocity is measly 2–5 m/y.
Highlights
experi mental arguments that ice sheet surface fluctuation in Antarctica is mediated by ice velocity
understand this link we use temporal coherence to refer to the comparison between vertical profile
Observations in area of Dome A and its slope have revealed such behavior of surface, where the sur face is placid and ice velocity is measly 2–5 m/y
Summary
Одним из значительных достижений Меж дународного полярного года 2007–2008 стало создание цифровой карты скоростей движе ния льда в Антарктиде. Эта карта получена в результате кооперации четырёх космических агентств – NACA, ESA, CSA (Канада), JA X A (Япония) – путём комбинации интерфероме трических радарных космических измерений с синтезированной апертурой, выполненных в
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