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Unprecedented U.S.-British project launches to study the world’s most dangerous glacier - The Washington Post
“For global sea-level change in the next century, this Thwaites glacier is almost the entire story,” said David Holland, a geoscientist at New York University, who will pair with British Antarctic Survey researcher Keith Nicholls to lead one of the six scientific field missions.
climate  science  antarctica 
17 days ago by yorksranter
Future projections of Antarctic ice shelf melting based on CMIP5 scenarios: Journal of Climate: Early Online Release
Naughten et al 2018: Basal melting of Antarctic ice shelves is expected to increase during the 21st century as the ocean warms, which will have consequences for ice sheet stability and global sea level rise. Here we present future projections of Antarctic ice shelf melting using FESOM (Finite Element Sea-ice/ice-shelf Ocean Model) forced with atmospheric output from CMIP5 (Coupled Model Intercomparison Project phase 5) models. CMIP5 models are chosen based on their agreement with historical atmospheric reanalyses over the Southern Ocean; the best-performing models are ACCESS 1.0 and the CMIP5 multi-model mean. Their output is bias-corrected for the RCP (Representative Concentration Pathway) 4.5 and 8.5 scenarios. During the 21st-century simulations, total ice shelf basal mass loss increases by between 41% and 129%. Every sector of Antarctica shows increased basal melting in every scenario, with the largest increases occurring in the Amundsen Sea. The main mechanism driving this melting is an increase in warm Circumpolar Deep Water on the Antarctic continental shelf. A reduction in wintertime sea ice formation simulated during the 21st century stratifies the water column, allowing a warm bottom layer to develop and intrude into ice shelf cavities. This effect may be overestimated in the Amundsen Sea due to a cold bias in the present-day simulation. Other consequences of weakened sea ice formation include freshening of High Salinity Shelf Water and warming of Antarctic Bottom Water. Furthermore, freshening around the Antarctic coast in our simulations causes the Antarctic Circumpolar Current to weaken and the Antarctic Coastal Current to strengthen.

BAMS media notice: Antarctica in general hasn't been melting the way the Arctic has, so far. But a new modeling study shows that the as the Southern Ocean warms, a reduction in wintertime sea ice formation will enable a warm bottom layer of water to intrude into ice shelf cavities, melting them from below. Every part of Antarctica is affected, and as the floating ice shelves melt—as much as four times faster than today—the enormous Antarctic Ice Sheet they extend from will destabilize, allowing glacial ice to flow more quickly into the sea and melt, raising global sea levels.
Antarctica  iceshelf  icesheet  Climate_Science_study 
26 days ago by huntercutting
The White Darkness: A Journey Across Antarctica | The New Yorker
A profile and detailed description of British soldier, Antarctic expeditioner, and Shackleton acolyte Henry Worsley and his attempt to cross Antarctica by himself.
antarctic_exploration  antarctica  henry_worsley  shackleton  new_yorker 
5 weeks ago by sawtoothwave
Antarctica Erupts! | Travel | Smithsonian
Mount Erebus had started acting up in early 2005, and when scientists arrived it was erupting several times a day, each time ejecting 50 or so lava bombs. The largest are about ten feet wide—great blobs of bubbly lava that collapse like failed soufflés when they land, some almost a mile away.
6 weeks ago by jdavis_ls
RT : Periodic reminder how amazing the time zone map is in 🇦🇶
Antarctica  from twitter
7 weeks ago by daisyk
Tourists are swarming Antarctica to see it before it’s gone | The Outline
“Join our team on this special voyage that equips leaders with resources and actionable solutions to become a part of a global force of change.” This isn’t the description for Doctors Without Borders. It’s for a luxury Antarctic vacation expedition through the company Explorer’s Passage.
additivism  antarctica  anthropocene  climate  change  environment  global  warming  tourism  travel  stream 
9 weeks ago by therourke

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