Ice sheet disintegration

Disintegration sheet

Ice sheet disintegration

How rapidly ice sheets can disintegrate is one of the most uncertain and imporant climate issues. Disintegration of the West Antarctic ice sheet ( that portion of the Antarctic ice sheet lying in the western hemisphere) initiates a chain of events which culminates in a global ice age. ( ) report from observed fast grounding- line retreat , " it was speculated, thinning of a glacier in Pine Island Bay ( Rignot 1998; Shepherd et al. How can the answer be improved? 24640 Issued in May NBER Program( s) : Environment Energy Economics Public Economics. Concerns about the impact on large- scale earth systems have taken center stage in the scientific and economic analysis of climate change. The West Antarctic Ice Sheet and the Thwaites Glacier.

As Hillenbrand et al. The WAIS is a marine ice sheet, with much of its base grounded below sea level with float- ing ice shelves exposed to disintegration warming subsurface ocean currents that cause basal melt ( Church et al. Most of the WAIS bedrock is below sea level due to the weight of the ice sitting on it. 3 meters global SLR, on top of other effects such as thermal expansion of sea- water ( Church et al. The WAIS disintegration became a foregone conclusion when it was discovered that the base of the sheet was separating from bedrock below; that ocean water had begun to float the ice sheet off its base. Are Antarctica' s Ice Sheets Near a Climate Tipping Point? NBER Working Paper No. But that disintegration was expected to take many centuries.
In late February the Wilkins Ice Shelf on the Antarctic Peninsula disintegrated an indication of warming temperatures in the region. The dominant physical process causing ice sheet disintegration may be absorption of heat by the ocean ( due to an increasing greenhouse. Ten independent bodies of data can be interpreted as evidence that the West Antarctic ice sheet has been and is disintegrating. Scientists fear that parts of the ice sheet may be in the early stages of an unstoppable disintegration. — Justin Gillis But miraculously officials say the countless bits of debris from the disintegration of the space shuttle Columbia injured not a soul on the ground. A total WAIS disintegration would cause roughly 3. The dominant physical process causing ice sheet disintegration may be absorption of heat by the ocean ( due to an increasing greenhouse effect) resulting melting of ice shelves, thus an increased rate of discharge of ice from the ice sheet to the ocean. The Moderate Resolution Imaging Spectroradiometer ( MODIS) sensors on NASA' s Terra and Aqua satellites provided some of the earliest disintegration evidence of the disintegration.

The West Antarctic Ice Sheet ( WAIS) is often described as the world' s most unstable large ice sheet. Ice sheet change is expected to be a " slow" climate feedback. Ice shelves range in thickness from about 50 to 600 meters some shelves persist for thousands of years. An ice shelf is a thick slab of ice attached to a coastline extending out over the ocean as a seaward extension of the grounded ice sheet. The Economics of Disintegration of the Greenland Ice Sheet William D. In the past few years, scientists have identified marine ice- cliff instability as a feedback loop that could kickstart the disintegration of the entire West Antarctic ice sheet this century. , ), from the timing.


Ice sheet disintegration. The present study analyzes the economic impact of a potential disintegration of the Greenland Ice Sheet ( GIS). Award Abstract # NSF- NERC: Disintegration of Marine Ice- sheets using Novel Optimised Simulations ( DOMINOS). signs that are consistent with the theory of rapid ice shelf disintegration,.


Sheet disintegration

A new analysis of ice sheet instability,. As warm summer temperatures push farther south, so will the problems of melt ponding, ice shelf disintegration, and ice cliff collapse, which drive the. ice sheet, as reconstructed for the CLIMAP 18000 years B. experiment, and disintegration was allowed to proceed to completion for the 125000 B. sea- level and air- temperature boundary conditions. The collapse of the Larsen B Ice Shelf was captured in this series of images from the Moderate Resolution Imaging Spectroradiometer on NASA’ s Terra satellite between January 31 and April 13,.

ice sheet disintegration

At the start of the series, the ice shelf ( left) is tattooed with parallel lines of blue dots. The Antarctic ice sheet' s loss of mass, meanwhile, traps warmer water below the surface, eroding glaciers from underneath in a vicious circle of accelerated melting that contributes to sea level rise.