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Seafloor, sea-level, shear zones, subduction, sedimentation, and seismology
Date:1/14/2014

WC1E 6BT, UK; p.c.tzedakis@ucl.ac.uk. Posted online 10 January 2014, http://dx.doi.org/10.1130/G35070.1. OPEN ACCESS.

Past glacials can be thought of as natural experiments in which different combinations of boundary conditions (such as the seasonal and latitudinal distribution and magnitude of incoming sunlight, the extent and distribution of continental ice sheets, the Earth's reflection of received insolation, and atmospheric greenhouse gas concentrations) influenced the character of climate change. These "experiments" can provide a more complete view of the range and underlying physics of natural climate variability. Although our understanding of the nature of changes during the last glacial is fairly advanced, our grasp of such changes during previous glacials has remained sketchy. Work by Vasiliki Margari and colleagues addresses this gap by providing a synthesis of centennial to multi-millennial changes in the coupled ocean-land system at the Iberian margin in the North Atlantic during the penultimate glaciation and how these relate to the framework of ice volume changes with particular reference to European ice-sheet dynamics. Their results have implications for our understanding of the sensitivity of the Atlantic ocean overturning circulation to freshwater fluxes. More specifically, they suggest that the regional distribution of ice sheets and location of freshwater discharges may influence the extent of ocean heat transport between hemispheres.


The geologic record of deep episodic tremor and slip
Nicholas W. Hayman and Luc L. Lavier, Institute for Geophysics, University of Texas, 10100 Burnet Road, R2200, Austin, Texas 78758, USA; hayman@ig.utexas.edu. Posted online 10 January 2014, http://dx.doi.org/
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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