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AGU journal highlights -- Dec. 31, 2008
Date:1/2/2009

mal structure determines this latitude in dry atmospheres. It remains to be investigated how latent heat release in phase changes of water influences the Hadley cell termination.

Title: Extent of Hadley circulations in dry atmospheres

Authors: Robert L. Korty: Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, U.S.A.;

Tapio Schneider: California Institute of Technology, Pasadena, California, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL035847, 2008; http://dx.doi.org/10.1029/2008GL035847


6. Cause of glacial earthquakes in Greenland clarified

Satellite observations during the past decade have shown dramatic changes in flow speed on year-to-year timescales at Greenland's outlet glaciers. Seismic events traced back to glaciers during the same time period have been interpreted to have resulted from calving events at the glacier terminus or surging events lubricated by subglacial meltwater. To learn more, Nettles et al. conducted geodetic studies at Helheim Glacier, one of Greenland's largest outlet glaciers, during summer 2007. They observed several large and sudden increases in flow speed along the length of the glacier. These accelerations coincided with glacial earthquakes and major iceberg calving events. No offset in the position of the glacier surface was observed during these events. Instead, modest tsunamis associated with the glacial earthquakes implicate glacier calving as the generator of seismic events, putting to rest the idea that lurching glaciers are responsible for glacial earthquakes at outlet glaciers like Helheim, and demonstrating a link between ice loss and glacier acceleration.

Title: Step-wise changes in glacier flow speed coincide with calving and glacial earthquakes at Helheim Glacier, Greenland

Authors: M. Nettles and G. Ekstr
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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