Geomorphological Map of Ribbed Moraines on the Dubawnt Lake Palaeo-Ice Stream Bed: A Signature of Ice Stream Shut-down?
نویسندگان
چکیده
منابع مشابه
Ice-stream stability on a reverse bed slope
Marine-based ice streams whose beds deepen inland are thought to be inherently unstable1–3. This instability is of particular concern because significant portions of the marinebased West Antarctic and Greenland ice sheets are losing mass and their retreat could contribute significantly to future sea-level rise4–7. However, the present understanding of icestream stability is limited by observati...
متن کاملRibbed bedforms on palaeo-ice stream beds resemble regular patterns of basal shear stress (‘traction ribs’) inferred from modern ice streams
Rapidly-flowing ice streams are an important mechanism through which ice sheets lose mass, and much work has been focussed on elucidating the processes that increase or decrease their velocity. Recent work using standard inverse methods has inferred previously-unrecognised regular patterns of high basal shear stress (‘sticky spots’ >200 kPa) beneath a number of ice streams in Antarctica and Gre...
متن کاملShallow ice stream approximation
Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion EGU Abstract New analytical solutions describing the effects of small-amplitude perturbations in boundary data on flow in the shallow ice stream approximation are p...
متن کاملNumerical investigations of the slow - down ofWhillans Ice Stream , West Antarctica : is it shutting down like Ice StreamC ?
We investigate whether the recent slow-down of Whillans Ice Stream (WIS),West Antarctica, may lead to its complete stoppage in the near future, using a numerical model. Basal resistance to ice-stream motion is represented by a continuous till layer whose strength changes in response to basal melting and freezing.We implement a basal drainage system, which acts to hinder ice-stream stoppage thro...
متن کاملTidal Modulation of Ice Stream Motion
3-104 3-105 Investigation of the recently discovered phenomenon that the motion of major West Antarctic ice streams is modulated strongly by forces that vary with tidal oscillations of the ice shelf was based largely on the capabilities of GPS receivers and the availability of a large number of such receivers from UNAVCO. During the 2003-04 field season, 15 UNAVCO receivers along with some owne...
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ژورنال
عنوان ژورنال: Journal of Maps
سال: 2006
ISSN: 1744-5647
DOI: 10.4113/jom.2006.43