Internal dynamics condition centennial-scale oscillations in marine-based ice-stream retreat
نویسندگان
چکیده
منابع مشابه
Record ice retreat
The European Space Agency said that a series of photographs taken through September showed an ice-free passage along northern Canada, Alaska and Greenland as ice was retreating to its lowest level since images were first taken in 1978. The search for a route from the Atlantic around the top of North America and into the Pacific occupied explorers for centuries. Now a growing band of sailing adv...
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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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Since the mid-Pleistocene transition, deglaciation has occurred only after ice sheets have grown large while experiencing several precession and obliquity cycles, indicating that large ice sheets are more sensitive to Milankovitch forcing than small ice sheets are. Observations and model simulations suggest that the development of ice streams in the Laurentide Ice Sheet played an as yet unknown...
متن کاملRapid last-deglacial thinning and retreat of the marine-terminating southwestern Greenland ice sheet
a Department of Geoscience, University of Wisconsin, Madison, WI 53706, USA b College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA c Department of Physics and Astronomy/PRIME Lab, Purdue University, West Lafayette, IN 47907, USA d Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA e Departmen...
متن کاملFracture field for large-scale ice dynamics
Recent observations and modeling studies emphasize the crucial role of fracture mechanics for the stability of ice shelves and thereby the evolution of ice sheets. Here we introduce a macroscopic fracture-density field into a prognostic continuum ice-flow model and compute its evolution incorporating the initiation and growth of fractures as well as their advection with twodimensional ice flow....
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ژورنال
عنوان ژورنال: Geology
سال: 2017
ISSN: 0091-7613
DOI: 10.1130/g38991.1