Whereas previous studies have used simplified models, idealised forcing, or limited domains, we will use a comprehensively initialised model of ice flow throughout Antarctica, including all mechanical processes that propagate thinning into the interior, to produce a highly-realistic simulation that can predict the response of the grounded ice
sheet to the ice-shelf thinning observed by satellite.
However, the ice shelves are of huge importance because they buttress the ice flow from the grounded ice
into the ocean.
"The stability of ice shelves is important because they resist the flow of the grounded ice
inland," (https://www.bas.ac.uk/media-post/new-footage-shows-rift-in-larsen-c-ice-shelf/) said BAS ice and ocean modeler Dr.
"Prior to starting our analysis, we were expecting to find a decline in ice thickness and grounded ice
based on our examination of temperature and precipitation records of the past five decades from the Barrow meteorological station," said Surdu "At the end of the analysis, when looking at trend analysis results, we were stunned to observe such a dramatic ice decline during a period of only 20 years." The research team used satellite radar imagery from ESA to determine that 62 per cent of the lakes in the region froze to the bottom in 1992.
The Canadian Hydrographic Service glossary defines two terms that describe stationary ice: "grounded ice
" is floating ice that is temporarily aground in shoal water, while "stranded ice" is ice that, after floating, has been deposited on the shore by retreating high water.
The grounded ice
bridge constructed by the 6th Engineer Battalion (Combat) (Airborne) was a structure that closely resembled a road rather than a bridge.
However, the acceleration of glaciers draining ice from the grounded ice
sheet has been reported as a consequence of ice-shelf retreat in several places.
Engineers are also concerned with the sliding resistance of grounded ice
islands and the physical distortion that may take place during loading events (C-CORE, 2005).
The sonar images clearly showed objects resembling rocks and other debris that may have once been dragged along the seafloor beneath the grounded ice
. "Such amazingly coherent sets of streamlined grooves and ridges could only be made by one thing--sliding ice," Polyak explains.
During the next 100 years, and perhaps the next 200 years, it is probable that greater snowfall on Antarctica will outweigh the increased loss of grounded ice
caused by increasing ocean temperatures, the statement says.
The proposed project aims to constrain these dominant processes affecting the Thwaites and the Dotson Ice Shelves, as well as the grounded ice
mass buttressed by these ice shelves.
Overall, there was a 22 per cent reduction in what the researchers call "grounded ice
" from 1992 to 2011.