How old is the antarctic ice sheet




















The Antarctic Ice Sheet is an important indicator of climate change and driver of sea-level rise. Fretwell, P. Bedmap2: improved ice bed, surface and thickness datasets for Antarctica.

Cryosphere 7 , — Rignot, E. Ice flow of the Antarctic ice sheet. Science , — Zwally, H. Antarctic and Greenland drainage systems. Shepherd, A. Recent loss of floating ice and the consequent sea level contribution. Cook, A. Overview of areal changes of the ice shelves on the Antarctic Peninsula over the past 50 years. Cryosphere 4 , 77—98 Konrad, H.

Net retreat of Antarctic glacier grounding lines. Joughin, I. Changes in west Antarctic ice stream velocities: observation and analysis. Solid Earth , Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf.

Inland thinning of the Amundsen Sea sector, West Antarctica. Scambos, T. Glacier acceleration and thinning after ice shelf collapse in the Larsen B embayment, Antarctica. Mass balance of polar ice sheets. Wingham, D. Antarctic elevation change from to Velicogna, I. Measurements of time-variable gravity show mass loss in Antarctica.

Cryosphere 12 , — King, M. Lower satellite-gravimetry estimates of Antarctic sea-level contribution. Nature , — Briggs, K. Charting ice-sheet contributions to global sea-level rise. A reconciled estimate of ice-sheet mass balance. Antarctic grounding line mapping from differential satellite radar interferometry. Bentley, M. Peltier, W. Earth Planet.

Computations of the viscoelastic response of a 3-D compressible earth to surface loading: an application to glacial isostatic adjustment in Antarctica and Canada. Sasgen, I. Antarctic ice-mass balance to regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates. Solid Earth , — Incomplete separability of Antarctic plate rotation from glacial isostatic adjustment deformation within geodetic observations.

Whitehouse, P. A new glacial isostatic adjustment model for Antarctica: calibrated and tested using observations of relative sea-level change and present-day uplift rates. Spada, G. SELEN v2. Potential of the solid-Earth response for limiting long-term West Antarctic Ice Sheet retreat in a warming climate.

Briggs, R. A data-constrained large ensemble analysis of Antarctic evolution since the Eemian. Ivins, E. Antarctic glacial isostatic adjustment: a new assessment. Nield, G. Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading.

Mouginot, J. Glacier ice is blue because the red long wavelengths part of white light is absorbed by ice and the blue short wavelengths light is transmitted and scattered. The longer the path light travels in ice, the more blue it appears. Glaciers exist on every continent except Australia. What is a glacier? A glacier is a large, perennial accumulation of crystalline ice, snow, rock, sediment, and often liquid water that originates on land and moves down slope under the influence of its own weight and gravity.

Typically, glaciers exist and may even form in areas where: mean annual temperatures are close to the freezing point winter precipitation Filter Total Items: 9. Year Published: U. View Citation. Latysh, N. Williams, Richard S. Year Published: The United States National Climate Assessment - Alaska Technical Regional Report The Alaskan landscape is changing, both in terms of effects of human activities as a consequence of increased population, social and economic development and their effects on the local and broad landscape; and those effects that accompany naturally occurring hazards such as volcanic eruptions, earthquakes, and tsunamis.

Markon, Carl J. Stuart; Markon, Carl J. Stuart, III. Molnia, Bruce F. Kennedy, Ben W. Year Published: Satellite image atlas of glaciers of the world U. Filter Total Items: 6. Date published: May 10, Date published: December 9, In this Landsat EarthView, one glacier in Chile bucks the global trend:. Date published: September 28, Date published: March 18, Date published: January 20, Date published: August 25, Filter Total Items: List Grid.

July 19, Researchers start drilling an ice core in the Greater Yellowstone Ecosystem. That is a great question. In fact, there are several ways in which we know when ice first began to accumulate on the Antarctic continent. Firstly, offshore seismic surveys and drilling campaigns of sediments on the continental slope and shelf. These sediments are dated using biostratigraphical methods such as dinoflagellate cysts , strontium isotopes analysis on pristine shells, and by isotopic analysis of volcanic rocks see Davies et al.

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