The linked presentation is entitled: “RAPID RESPONSE OF WEST ANTARCTIC ICE SHELVES TO EL NIÑO AND LA NIÑA”; and it indicates that El Nino events result in accelerated ice mass loss from Amundsen Sea ice shelves:https://scripps.ucsd.edu/news/scripps-news-2016-agu-fall-meeting
El Niño’s Immediate Effects on Antarctica’s Ice Shelves
C14A-05 • Monday, Dec. 12, 5 p.m. • Moscone West 3007
Description: "Ice shelves experience rapid changes when the global climate phenomenon known as El Niño occurs. Researchers at Scripps Institution of Oceanography at the University of California San Diego and Earth and Space Research in Corvallis, Ore. found that El Niño thickens the ice shelves by increasing snowfall on top of them, and thins the ice shelves by increasing melt below them as warm ocean water comes into contact with their bases.
The researchers, led by Scripps postdoctoral researcher Fernando Paolo, analyzed surface-height records made between 1994 and 2012 at the Amundsen Sea ice shelves in West Antarctica. They found that El Niño episodes lead to a net loss in ice-shelf mass because the ice lost at the base is denser than the snow gained at the surface.
The study suggests that if El Niños become more frequent in a future climate, the variability of ice shelves will increase. This has a range of implications for the dynamics of grounded ice in Antarctica, which is a source of large uncertainty in global sea-level rise projections. The study also highlights the importance of the contribution of changing snowfall on ice-shelf mass balance at timescales shorter than a decade, which has been underappreciated until now."