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- W4236073459 abstract "Abstract. Radio-echo sounding of the Antarctic and Greenlandic ice sheets often reveals a layer in the lowest hundreds of meters above bedrock more or less free of radio echoes, known as the echo-free zone (EFZ). The cause of this feature is unclear, so far lacking direct evidence for its origin. We compare echoes around the EPICA drill site in Dronning Maud Land, Antarctica, with the microstructural and dielectrical properties of the EPICA-DML ice core. We find that echoes disappear in the depth range, where the coherency of the layers is lost due to disturbances caused by the ice flow. At the drill site, the EFZ onset at ~2100 m marks a boundary, below which the ice core may have experienced flow induced disturbances on various scales. The dating of the climate record becomes increasingly difficult below 1900 m, until correlation with the Dome C record is lost below 2417 m depth. The onset also indicates changing rheology which needs to be accounted for in the modeling of ice sheet dynamics." @default.
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- W4236073459 date "2009-04-28" @default.
- W4236073459 modified "2023-10-18" @default.
- W4236073459 title "Layer disturbances and the radio-echo free zone in ice sheets" @default.
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- W4236073459 doi "https://doi.org/10.5194/tcd-3-307-2009" @default.
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