Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data
نویسندگان
چکیده
منابع مشابه
Subglacial conditions during and after stoppage of an Antarctic Ice Stream: Is reactivation imminent?
[1] Borehole observations from the base of the WestAntarctic Ice Sheet (WAIS) reveal the presence of a 10 to 15 m thick accretionary basal ice layer in the upstream area of Kamb Ice Stream (KIS). This ice layer has formed over a time of several thousand years by freeze-on of subglacial water to the ice base and has recorded during this time basal conditions upstream of its current location. Ana...
متن کاملSedimentary Processes at the Base of a West Antarctic Ice Stream: Constraints from Textural and Compositional Properties of Subglacial Debris
Samples of sediments from beneath Ice Stream B (at camp UpB), West Antarctica, provide the first opportunity to study the relationship between sediment properties and physical conditions in a sub-ice-stream environment. Piston coring in holes bored by hot-water drilling yielded five 1–3 m long, undisturbed subglacial sediment cores. We analyzed granulometry, composition, and particle morphology...
متن کاملSubglacial hydrology and ice stream margin locations
Fast flowing ice streams in West Antarctica are separated from the nearly stagnant ice in the adjacent ridge by zones of highly localized deformation known as shear margins. It is presently uncertain what mechanisms control the location of shear margins, and possibly allow them to migrate. In this paper we show how subglacial hydrological processes can select the shear margin location, leading ...
متن کاملUsing a Near-Bed Sediment Flux Sensor to Measure Wave Formed Bedform Migrations and Formation Processes
My research program focuses on identifying and quantifying sediment erosion, transport, and deposition processes on the continental shelf through state of the art observational techniques in both fine grained and sandy environments. In sandy environments, my goal is to understand the detailed interactions and feedbacks between hydrodynamics, bedforms, and the resulting sand transport. In fine-g...
متن کاملIce-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...
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ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 2016
ISSN: 0022-1430,1727-5652
DOI: 10.1017/jog.2016.18