reconstructed from sub-ice shelf and offshore sediments
J.A. Smith; C.-D. Hillenbrand; C. Subt; B.E. Rosenheim; T. Frederichs .
Abstract:
Because ice shelves respond to climatic forcing over a range of time
scales, from years to millennia, an understanding of their long-term
history is critically needed for predicting their future evolution. We
present the first detailed reconstruction of the Larsen C Ice Shelf (LCIS),
eastern Antarctic Peninsula (AP), based on data from sediment cores
recovered from below and in front of the ice shelf. Sedimentologic and
chronologic information reveals that the grounding line (GL) of an expanded
AP ice sheet had started its retreat from the midshelf prior to 17.7 ± 0.53
Credit: Shane Rooyakkers.
Boulder, Colo., USA: Volcanologists ability to estimate eruption risks is largely reliant on knowing where pools of magma are stored, deep in the Earth s crust. But what happens if the magma can t be spotted?
Shane Rooyakkers, a postdoctoral scholar at GNS Science in New Zealand, grew up in the shadow of Mount Taranaki on the country s North Island, hiking on the island s many volcanoes. Today, his research is revealing hidden dangers that may have been beneath his feet all along.
A new study, published yesterday in
Geology, explores a threat volcanologists discovered only recently: surprisingly shallow magma pools that are too small to be detected with common volcano monitoring equipment. Such a magma body was discovered in Iceland in 2009, when scientists with the Iceland Deep Drilling Project accidentally drilled directly into the molten rock two kilometers shallower than the depths where magma had been detected before. Magma began to creep up the d