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Large outlet glaciers draining the Greenland Ice Sheet significantly influence overall ice sheet mass balance.
Obsidian Hydration Dating This method is used to calculate ages in years by determining the thickness of rims (hydration rinds) produced by water vapor slowly diffusing into freshly chipped surfaces on artifacts made of obsidian or recent volcanic glass.
An additional requirement for accuracy is that the fossil samples do not have a significant lag time associated with their deposition in a lake.
Our results indicate that Jakobshavn Isbræ, and presumably other large marine calving glaciers, have the ability to advance quickly in response to climate forcing.► We reconstruct the timing of the Little Ice Age advance of Jakobshavn Isbræ.
► Jakobshavn Isbræ experienced a large and rapid advance in the 18th–19th centuries.
A varve sequence might also have events in it of known calendar age, such as beds from flood events or volcanic ash layers that have historic records associated with them.
The more usual case is when numerical ages (estimates of true calendar ages) based on radiometric or other techniques are applied to varves.